National Service Change Notices and Public Statements

When NWS proposes or finalizes changes to products or services, this page is updated and official notices are sent out on the NOAA Weather Wire Service (NWWS), the Emergency Managers Weather Information Network (EMWIN) and NOAAPort.

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• Service Change Notices (Current-2021)
• Data Management Messages
• Archive of PNS/SCN/TIN (1996-2020)

Public Information Statements 2024

• Dec 18: PNS24-78: Soliciting Comments on Proposed Termination of Terminal Aerodrome Forecasts (TAFs) at Anniston Regional Airport, Anniston, Alabama (KANB) through January 18, 2025
• Dec 18: PNS24-77: Soliciting Comments through June 30, 2025, on the Experimental Hydrologic Ensemble Forecast Service (HEFS) API Data Services
• Dec 18: PNS24-76: Soliciting Comments on Proposed Changes to the Probabilistic Tropical Cyclone Storm Surge (P-Surge) Model through January 22, 2025
• Dec 16: PNS24-75: Soliciting Comments on Upgrade 4.3 of the National Blend of Models through January 21, 2025
• Dec 9: PNS24-73 Updated: CANCELED: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on December 12, 2024
• Dec 9: PNS24-66 Updated: Potential API Gridded Forecast Data Outage from December 22, 2024 through January 1, 2025
• Dec 4: PNS24-74: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on December 10, 2024
• Dec 9: PNS24-73 Updated: CANCELED: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on December 12, 2024
• Dec 9: PNS24-66 Updated: Potential API Gridded Forecast Data Outage from December 22, 2024 through January 1, 2025
• Nov 14: PNS24-72: Soliciting Comments through October 31, 2025 on the Experimental Probabilistic Precipitation Portal (PPP)
• Nov 8: PNS24-71: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on November 12, 2024
• Nov 8: PNS24-70: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on November 14, 2024
• Oct 31: PNS24-69: Soliciting Comments through December 1, 2024 to Support Termination of the 72-Hour Low Tracks Graphic and the Non-Technical 72-Hour Low Tracks Graphic
• Oct 28: PNS24-68: Soliciting Comments for Transition of Select Area Forecasts (FA) through November 28, 2024
• Oct 16: PNS24-67: Soliciting Comments on the experimental Graphical Week Two Marine Wind Speed and Wave Height Probabilities through September 30, 2025
• Oct 16: PNS22-10 Updated: Soliciting Comments until May 31, 2025 on Snow Ratio Grids as an Experimental Element in the National Digital Forecast Database (NDFD)
• Dec 9: PNS24-66 Updated: Potential API Gridded Forecast Data Outage from December 22, 2024 through January 1, 2025
• Oct 16: PNS24-65: Soliciting Comments on the Proposed Termination of the Tropical Weather Summary through November 20, 2024
• Oct 15: PNS21-68 Updated: Soliciting Comments on the Experimental Standardized Weather Forecast Office (WFO) Avalanche Weather Webpage at 18 WFOs through April 30, 2025 
• Oct 10: PNS24-64 Updated: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast Scheduled for October 17, 2024 Canceled
• Oct 10: PNS24-63 Updated: National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast Scheduled for October 15, 2024 Canceled
• Oct 7: PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2025
• Oct 7: PNS24-62 Updated: Soliciting Comments through November 2, 2024 on the Discontinuation of the Max/Min Temperature and Precipitation Table Product (RTP) for all NWS Central Region Offices
• Sep 26: PNS24-61: Soliciting Comments on Prototype NOAA Atlas 15 Precipitation Frequency Services over Montana through January 31, 2025 
• Sep 25: PNS22-42 Updated: Soliciting Comments on the Experimental Flood Hazard Outlook (FHO) Product through June 30, 2025
• Sep 25: PNS22-55 Updated: Soliciting Comments on Experimental Flood Inundation Mapping (FIM) Services through September 30, 2025
• Sep 25: PNS22-43 Updated: Extending Comment Period on the National Water Center's Experimental Area Hydrologic Discussion Product through June 30, 2025
• Sep 16: PNS23-59 Updated: Soliciting Comments through December 31, 2024 on the Experimental NWS Translation Website
• Sep 11: PNS24-60: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on September 19, 2024
• Sep 11: PNS24-59: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on September 17, 2024
• Aug 27: PNS24-39 Updated: Soliciting Comments through October 16, 2024 on a Proposal to Replace the Imperial Unit "Feet" with the Metric Unit "Meter" in National Marine Center High Seas Text and Graphical Products
• Aug 23: PNS24-58: Soliciting Comments through September 22, 2024 on Upgrading the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0.8
• Aug 23: PNS24-57: Soliciting Comments through September 23, 2024 on the Experimental Deployment of the Global Total Electron Content (GloTEC) Ionosphere Model
• Aug 27: PNS24-39 Updated: Soliciting Comments through October 16, 2024 on a Proposal to Replace the Imperial Unit "Feet" with the Metric Unit "Meter" in National Marine Center High Seas Text and Graphical Products
• Aug 20: PNS22-36 Updated: Extending Comment Period on Experimental Potential Coastal Flood Extent Overlays until August 30, 2025
• Aug 14: PNS24-56: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on August 20, 2024
• Aug 14: PNS24-55: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on August 22, 2024
• Jul 30: PNS24-54: Soliciting Comments through September 16, 2024 on a proposal to implement Partial County Alerting (PCA) via NOAA Weather Radio All Hazards (NWR) and the Emergency Alert System for Hennepin County, Minnesota
• Jul 29: PNS24-53: Soliciting Comments through September 16, 2024 on a Proposed Alaska Region change to use the Universal Geographic Code (UGC) County Equivalent Format for Short-Fused Polygon Warning and Advisory Products
• Jul 29: PNS24-52: Soliciting Comments on Upgrading the Climate Data Assimilation System (CDAS) to the Conventional Observation Reanalysis (CORe) through August 30, 2024
• Jul 18: PNS24-51: New Online Maps for NOAA Weather Radio All Hazards (NWR) Coverage and Tsunami Alerting Areas Along the Alaska, Washington, Oregon, and California Coastlines
• Jul 18: PNS24-50: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on July 25, 2024
• Jul 18: PNS24-49: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on July 30, 2024
• Jul 17: PNS24-48: Re-commencement of Operational Test and Evaluation (OT&E) for the Replacement Temperature and Dewpoint Sensor for the Automated Surface Observing System (ASOS) during July 2024
• Jul 17: PNS24-47: NWS is Extending the Public Comment and Review on the Experimental Use of Social Media through November 30, 2024
• Jun 28: PNS19-03 Updated: Soliciting Comments on the Experimental Graphical Hazardous Weather Outlook (GHWO) through February 28, 2025
• Jun 21: PNS24-46: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on June 27, 2024
• Jun 21: PNS24-45: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on June 25, 2024
• Jun 14: PNS24-44: Suspension of Radiosonde Observations at Tallahassee, FL: Effective July 1, 2024
• Jun 10: PNS24-43: Soliciting Feedback on the Proposed Use of "Particularly Dangerous Situation" Wording in Blizzard Warnings and Ice Storm Warnings through September 10, 2024
• Jun 3: PNS24-42: Soliciting Comments on the Addition of U.S. Inland Watches/Warnings to Tropical Cyclone Track and Error Cone Graphics from the National Hurricane Center through November 30, 2024
• Jun 3: PNS24-41: National Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing June 4, 2024
• Jun 3: PNS24-40: Soliciting Comments on the Proposed Implementation of Key Messages through August 31, 2024
• Aug 27: PNS24-39 Updated: Soliciting Comments through October 16, 2024 on a Proposal to Replace the Imperial Unit "Feet" with the Metric Unit "Meter" in National Marine Center High Seas Text and Graphical Products
• May 28: PNS24-38: Soliciting Comments on the Proposed Changes to Fire Weather Products to Support Discontinuation of Haines Index and Lightning Activity Level (LAL) as Fire Weather Forecast Elements through August 1, 2024
• May 17: PNS24-37: National Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing May 20-24, 2024 (backup Week: June 3-7)
• May 16: PNS24-36: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on May 23, 2024
• May 16: PNS24-35: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on May 21, 2024
• May 14: PNS24-34: Soliciting Comments on Updates to the NOS Operational Forecast System (OFS) Framework Version and the Implementation of the Oceanographic Forecast Modeling Systems for the Salish Sea and Columbia River through June 6, 2024
• May 3: PNS24-33: National Weather Service (NWS) Directives System URL Change: Effective on or about June 3, 2024
• Sep 16: PNS23-59 Updated: Soliciting Comments through December 31, 2024 on the Experimental NWS Translation Website
• Apr 25: PNS24-32: Hurricane Threats and Impacts (HTI) Mosaic Testing on April 25, 2024
• Apr 22: PNS22-41 Updated: Soliciting Comments through October 31, 2024 on Expansion of Experimental Surf Forecast Matrix to 7 WFOs
• Apr 22: PNS24-31: Soliciting Comments on Experimental HeatRisk Grids in the National Digital Forecast Database (NDFD) and WPC HeatRisk CONUS Viewer through September 30, 2024
• Apr 18: PNS24-30: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on April 25, 2024
• Apr 18: PNS24-29: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on April 23, 2024
• Apr 16: PNS24-28: WFO Fairbanks NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Tornado Warning on May 1, 2024
• Apr 15: PNS24-27: Soliciting Public Comments until May 16, 2024 on the Proposed Decommissioning of the NOAA Profiler Network (NPN)
• Apr 11: PNS24-26: Soliciting Comments on Proposed Termination of Terminal Aerodrome Forecast (TAF) at Troy Municipal Airport, Troy, AL (KTOI) through May 7, 2024
• Apr 11: PNS24-25: Hurricane Threats and Impacts (HTI) Mosaic Testing on April 11, 2024 and April 25, 2024
• Sep 25: PNS22-42 Updated: Soliciting Comments on the Experimental Flood Hazard Outlook (FHO) Product through June 30, 2025
• Apr 1: PNS24-24: Soliciting Comments on Prototype Period for Fire Detection and Monitoring until November 1, 2024
• Mar 29: PNS24-23: Soliciting Comments on the Experimental Weeks 3-4 Mean North American 500 Millibar Height Outlook through June 26, 2024
• Mar 15: PNS24-22: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on March 31, 2024
• Mar 15: PNS24-21: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on March 19, 2024
• Mar 15: PNS24-20: Alaska NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Tsunami Warning on March 27, 2024 at 10:20 AM AKDT
• Mar 11: PNS24-19: NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Tsunami Warning by the Eureka, California Weather Forecast Office (WFO) on March 27, 2024 at Approximately 11:00 AM PDT
• Mar 11: PNS24-18: Soliciting Public Comments through April 11, 2024 on the Proposal to Limit Tropical Information in High Seas Forecasts from 120 Hours to Only the First 48 Hours
• Mar 5: PNS24-17: Indiana Statewide NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Tornado Warning on Tuesday, March 12, 2024 at 10:15 AM EDT
• Mar 1: PNS24-16: NOAA Weather Radio All Hazards (NWR) Service Termination from Station WXM88, Waynesboro, Georgia: Effective Immediately
• Feb 29: PNS24-15: Soliciting Comments on the Experimental Deployment of an Update to the Electric Power Dashboard Webpage through March 30, 2024
• Feb 28: PNS24-14: Soliciting Comments on the Removal of Certain Products from the Air Quality Model (AQM) Version 7 through March 28, 2024
• Feb 27: PNS24-13: Soliciting Comments on Experimental Spanish-Translated Tropical Cyclone Products from the National Hurricane Center (NHC) through November 30, 2024
• Feb 23: PNS24-12: Soliciting Public Comments on Potential Changes to the Real Time Ocean Forecast System (RTOFS) through March 27, 2024
• Feb 23: PNS24-11: Soliciting Comments on the Proposed Upgrade of LAMP and Gridded LAMP Guidance and the Discontinuation of Web Station Plots through March 25, 2024
• Feb 21: PNS24-10: Kentucky Statewide NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Tornado Warning on March 6, 2024 at 10:07 AM EST
• Feb 15: PNS24-09: WFO Fairbanks NOAA Weather Radio All Hazards (NWR) and Emergency Alert System (EAS) Live Event Code Test for a Flash Flood Warning on February 28, 2024
• Feb 14: PNS24-08: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on February 22, 2024
• Feb 14: PNS24-07: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on February 20, 2024
• Feb 12: PNS24-06: Soliciting Comments on Proposed Termination of the Day 3-7 Hemispheric Charts through April 12, 2024
• Feb 7: PNS24-05: Soliciting Public Comments on the Proposed Upgrades of Hurricane Analysis and Forecast System (HAFS) Version-2 through March 11, 2024
• Feb 1: PNS24-04: Soliciting Comments through March 6, 2024 on Proposed Changes to the OPC 24-Hour Surface and Wind and Wave Forecast Charts, the 24-Hour Wind and Wave Forecast Chart, and 24-Hour Surface Chart
• Jan 18: PNS24-03: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on January 25, 2024
• Jan 18: PNS24-02: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on January 23, 2024
• Jan 16: PNS24-01: Enforcement of Geographical Boundaries in the Atlantic and Eastern North Pacific Tropical Weather Discussions from the National Hurricane Center’s Tropical Analysis and Forecast Branch: Effective on or around May 15, 2024

Public Information Statements 2023

• Dec 19: PNS23-66 Updated: Scheduled National Tsunami Warning Center Routine Communications Test for the East and Gulf Coast on December 19, 2023 Canceled
• Dec 19: PNS23-70: Soliciting Comments until January 19, 2024 on discontinuing the Texas/Oklahoma Panhandles Supplementary Observations (AGO) Product
• Dec 18: PNS23-69: Soliciting Comments through January 18, 2024 on Extending the 34- and 50-kt Wind Radii Forecasts Operationally from 3 Days to 5 Days in the Tropical Cyclone Forecast/Advisory Product (TCM)
• Dec 12: PNS23-68: Soliciting Comments on the Experimental Hawaiian Extended Range Forecast Webpage until January 12, 2024
• Dec 6: PNS23-67: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on December 21, 2023
• Dec 19: PNS23-66 Updated: Scheduled National Tsunami Warning Center Routine Communications Test for the East and Gulf Coast on December 19, 2023 Canceled
• Nov 16: PNS23-63 Updated: Soliciting Comments through December 5, 2023 on the Discontinuation of the Max/Min Temperature and Precipitation Table Product (RTP) for all NWS Southern Region Offices
• Nov 16: PNS23-65: Soliciting Comments through December 15, 2023 Regarding Evaluation of National Water Prediction Service (NWPS) Website
  Proposed to Replace the Advanced Hydrologic Prediction Service (AHPS) Website
• Nov 14: PNS23-64: Soliciting Comments on the Experimental Caribbean and Central American Rainfall Graphic through November 30, 2025
• Nov 16: PNS23-63 Updated: Soliciting Comments through December 5, 2023 on the Discontinuation of the Max/Min Temperature and Precipitation Table Product (RTP) for all NWS Southern Region Offices
• Oct 16, 2024: PNS22-10 Updated: Soliciting Comments until May 31, 2025 on Snow Ratio Grids as an Experimental Element in the National Digital Forecast Database (NDFD)
• Nov 6: PNS23-62: Commencement of Operational Test and Evaluation (OT&E) for the Replacement Temperature and Dew Point Sensor for the Automated Surface Observing System (ASOS) during November 2023
• Nov 1: PNS23-61: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on November 9, 2023
• Nov 1: PNS23-60: National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast to Take Place on November 7, 2023
• Oct 30: PNS22-18 Updated: Weather Forecast Office (WFO) Guam to Produce Experimental Public and Marine Grids for East and West Micronesia for Inclusion into the National Digital Forecast Database: Effective March 29, 2022
• Sep 16, 2024: PNS23-59 Updated: Soliciting Comments through December 31, 2024 on the Experimental NWS Translation Website
• Oct 25: PNS23-58: The Slidell, Louisiana WSR-88D is to be Decommissioned on or about November 27, 2023 in Preparation for Relocation to Hammond, Louisiana
• Oct 23: PNS23-57: Soliciting Comments through December 31, 2023 on Experimental Deployment of Updated Solar Cycle Prediction Product Webpage
• Oct 20: PNS19-02 Updated: Soliciting Comments until April 30, 2024 on Availability of Probabilistic Snow Grids for Select Weather Forecast Offices (WFOs) as an Experimental Element in the National Digital Forecast Database (NDFD) for the Contiguous United States (CONUS)
• Oct 20: PNS14 Updated: Soliciting Comments until April 30, 2024 on the Continuation of the Probabilistic Winter Precipitation Forecast Experiment
• Oct 19: PNS23-56: Soliciting Public Comments through November 18, 2023 on the Proposed Termination of Certain Web Graphics Being Produced by EMC
• Oct 15, 2024: PNS21-68 Updated: Soliciting Comments on the Experimental Standardized Weather Forecast Office (WFO) Avalanche Weather Webpage at 18 WFOs through April 30, 2025 
• Oct 7, 2024:  PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2025
• Sep 28: PNS23-17 Updated: Soliciting Comments on Upgrading the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0 through October 28, 2023
• Sep 26: PNS23-55 Updated: Soliciting Comments on Experimental Flood Inundation Mapping (FIM) Services through September 30, 2024
• Sep 13: PNS23-54: Soliciting Comments through October 13, 2023 on the Proposed Upgrade of the North American Ensemble Forecast System (NAEFS) from Version 6 to Version 7
• Sep 5: PNS23-53: Soliciting Comments through October 5, 2023 on Experimental Storm Prediction Center (SPC) Day 1 Convective Outlook with Severe Timing Guidance and Graphic Displays
• Sep 1: PNS23-52: Soliciting Comments through November 30, 2023 on the Issuance of the Experimental Modernized Drought Information Statement (DGT) through Weather Forecast Office (WFO) “Drought Information Statement” Webpages and in PDF Format
• Aug 31: PNS23-51: Information to Assist Users Migrating to NWS-Direct Sources of NWS Common Alerting Protocol (CAP) Messages, Effective on or after July 20, 2023 
• Aug 23: PNS23-50: Anchorage, AK Federal Building Power Outage Will Affect some NWS Operational Data from August 25 to August 28, 2023
• Aug 17: PNS23-49: Soliciting Comments on Transition to Plain Language Headlines within NWS Alerting System through September 17, 2023
• Aug 15: PNS23-48: National Data Buoy Center (NDBC) will be Disestablishing Twelve Tropical Atmosphere Ocean (TAO) Array Stations in Accordance with the Recommendations of the Tropical Pacific Observing System 2020 Final Report: Beginning 2023
• Aug 10: PNS23-47: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on August 17, 2023
• Aug 10: PNS23-46: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on August 15, 2023
• Aug 1: PNS22-56 Updated: Soliciting Comments through January 31, 2024 for the Experimental Global Tropics Hazards Outlook for Week-3
• Jul 28: PNS23-45: Soliciting Comments on an Upgrade of the National Blend of Models through August 31, 2023
• Jul 24: PNS23-44: NWS Dissemination GIS Status Message – AWIPS Basemap Shapefile Configuration: Effective September 1, 2023
• Jul 13: PNS23-43: Soliciting Comments on the Upgrade of the Surge and Tide Operational Forecast System (STOFS) to Version 2.0.0 through September 27, 2023
• Jun 30: PNS23-42: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on July 13, 2023
• Jun 30: PNS23-41: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on July 11, 2023
• Jun 16: PNS23-40: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on June 21, 2023
• Jun 16: PNS23-39: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on June 20, 2023
• Jun 1: PNS23-38: Soliciting Comments on the Proposed Upgrade of the Ultraviolet Index (UVI) Forecast through June 30, 2023
• May 15: PNS23-37: Soliciting Comments on the Display of Future Plain Language Headlines to Replace “Advisory” through June 16, 2023
• May 15: PNS23-36: Soliciting Comments on Removing 1 Degree Fleet Numerical Meteorology and Oceanography Center Data from the North American Ensemble Forecast System through June 14, 2023
• May 12: PNS23-35: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on May 23, 2023
• May 12: PNS23-34: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on May 25, 2023
• May 12: PNS23-33: National Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing May 15-19, 2023
• May 10: PNS23-32: Soliciting Comments on Potential Decommissioning of the User-Defined Area Forecast Service and Webpage through July 30, 2023
• May 10: PNS23-31: Soliciting Comments on Potential Decommissioning of the NWS Enhanced Data Display (EDD) through July 30, 2023
• May 9: PNS23-30 REMINDER: Comments Sought by June 4, 2023 on National Weather Service Service Description Document v2.0 for Impact-based Decision Support Services
• Apr 28: PNS23-29: Soliciting Public Comments through May 30, 2023 on Proposed Changes to Alaska Aviation Weather Unit (AAWU) Area Forecast (FA) Issuance Times
• Apr 28: PNS23-28: Soliciting Public Comments on the Proposed Termination of Certain Web Graphics Being Produced by EMC through May 28, 2023
• Apr 27: PNS21-02 Updated: Soliciting Comments on the Experimental National Hydrologic Discussion through June 30, 2024
• Sep 25, 2024: PNS22-42 Updated: Soliciting Comments on the Experimental Flood Hazard Outlook (FHO) Product through June 30, 2025
• Sep 25, 2024: PNS22-43 Updated: Extending Comment Period on the National Water Center's Experimental Area Hydrologic Discussion Product through June 30, 2025
• Apr 25: PNS23-27: Changes to ‘Alaska Weather’ Television Program: Effective July 1, 2023
• Apr 21: PNS23-26: Soliciting Public Comments on Removing Global Forecast System (GFS) Wave Products from the EMC FTP Server through May 21, 2023
• Apr 5: PNS23-25: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on April 13, 2023 in Conjunction with the PACIFEX23 Tsunami Exercise
• Apr 5: PNS23-24: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on April 11, 2023
• Apr 4: PNS23-23: Soliciting Comments on the Experimental Deployment of the US-Canada 1D Geoelectric Model through May 4, 2023
• Apr 4: PNS23-22: Soliciting Comments on Proposed Changes to the Format and Delivery of NWS High Seas Forecast Information through May 4, 2023
• Apr 4: PNS23-21: Comments Sought by June 4, 2023 on National Weather Service Service Description Document v2.0 for Impact-based Decision Support Services
• Mar 27: PNS23-20: Soliciting Comments on Proposed Upgrades to the P-ETSS and ETSS Models through April 26, 2023 
• Mar 22: PNS23-19: Soliciting Comments on Proposed Changes to NWS Tropical Cyclone Watch/Warning Text Products Issued By Local Weather Forecast Offices through June 8, 2023
• Mar 22: PNS23-18: Soliciting Comments on Proposed Changes to NWS Coastal/Lakeshore Flood and Storm Surge Products and Services through June 8, 2023
• Sep 28: PNS23-17 Updated: Soliciting Comments on Upgrading the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0 through October 28, 2023
• Mar 16: PNS23-16: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on March 31, 2023
• Mar 1: PNS23-15: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast in Conjunction with the LANTEX23 Tsunami Exercise on March 2, 2023
• Feb 28: PNS23-14: Soliciting Comments on Prototype NWSChat 2.0 Application through April 3, 2023
• Feb 23: PNS23-13: Soliciting Public Comment on the Upgrade of the Whole Atmosphere Model-Ionosphere Plasmasphere Electrodynamics Model (WAM-IPE) Forecast System (WFS) to Version 1.2 through March 24, 2023
• Feb 22: PNS23-12: Soliciting Comments on the Proposed Discontinuation of the Marine Service Chart MSC-15 through March 27, 2023
• Feb 17: PNS23-11: Soliciting Comments through March 19, 2023 on the Proposed Removal of AutoNowCaster Products from the Multi-Radar, Multi-Sensor Application
• Feb 15: PNS23-10: Soliciting Comments on Discontinuing the Alaska Recreational River Forecast (RVRAK) until March 17, 2023
• Feb 15: PNS23-09: Soliciting Comments on Updates to Graphical Flood Products in Alaska until March 17, 2023
• Feb 10: PNS23-08: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast on February 24, 2023
• Feb 10: PNS23-07: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on February 21, 2023
• Feb 6: PNS23-06: Soliciting Comments on the Upgrade of the National Water Model to Version 3.0 through March 28, 2023
• Jan 25: PNS22-11 Updated: Soliciting Comments on Experimental Excessive Rainfall Outlook for Days 4-5 through February 26, 2023
• Jan 25: PNS23-05: Soliciting Comments on Discontinuing the Forecasts of High Pressure Systems in the High Seas Text Forecasts Issued by WFO Honolulu, Hawaii and the Ocean Prediction Center through February 27, 2023
• Jan 12: PNS23-04: Soliciting Comments on the Proposed Termination of the River and Lake Forecast Product (RVD) through February 23, 2023
• Jan 10: PNS23-03: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on January 19, 2023
• Jan 10: PNS23-02: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on January 17, 2023
• Jan 9: PNS23-01: Description of Known Issues and More Details Regarding Upgrade of the Surge and Tide Operational Forecast System (STOFS, Formerly ESTOFS) to Version 1.1.1: Effective January 10, 2023 

Public Information Statements 2022

• Dec 19: PNS22-72: Soliciting Comments on the Proposed Upgrade of GFS MOS, LAMP, and Gridded LAMP Guidance through January 11, 2023
• Dec 13: PNS22-26 Updated: Soliciting Comments through July 31, 2023 on the “Rapid Onset Drought” Hazard Type as an Experimental Element Within the 8- to 14-Day Hazards Outlook (Contiguous U.S. and Alaska)
• Dec 12: PNS22-71: Soliciting Comments through April 30, 2023 on Provision of Adding Prototype Air Quality (AQ) National Digital Guidance Database (NDGD) Graphics via Amazon Web Services (AWS)
• Dec 8: PNS22-70 Updated: Soliciting Public Comments on Changes to Hurricane Forecast Model Output in the Upcoming Hurricane Analysis and Forecast System (HAFS) through January 7, 2023
• Dec 7: PNS22-69: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on December 15, 2022
• Dec 7: PNS22-68: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on December 13, 2022
• Nov 23: PNS22-67 Updated: Soliciting Comments on the Upgrade of the Great Lakes Waves-Unstructured Forecast System (GLWU) to Version 2.0.0 through December 23, 2022
• Nov 22: PNS15 Updated: Comment Period Extended through April 30, 2023 on the Experimental Lake Effect Snow (LES) Warning Polygons from NWS Weather Forecast Offices (WFOs) Buffalo, NY; Binghamton, NY and Albany, NY
• Nov 16: PNS22-66: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on November 23, 2022
• Nov 16: PNS22-65: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on November 22, 2022
• Oct 26: PNS20-34 Updated: Seeking Public Comment and Review on Additions to Experimental Severe Weather Impact Graphics through April 30, 2023
• June 28, 2024: PNS19-03 Updated: Soliciting Comments on the Experimental Graphical Hazardous Weather Outlook (GHWO) through February 28, 2025
• Oct 21: PNS22-64: Soliciting Comments on the Retirement of the Airmen’s Meteorological Information (AIRMET) over the CONUS through November 20, 2022
• Oct 12: PNS22-12 Updated: Enhancements to the Experimental Probabilistic Winter Storm Severity Index (PWSSI): Effective October 11, 2022
• Oct 7, 2024:  PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2025
• Oct 15, 2024: PNS21-68 Updated: Soliciting Comments on the Experimental Standardized Weather Forecast Office (WFO) Avalanche Weather Webpage at 18 WFOs through April 30, 2025 
• Oct 5: PNS22-63: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on October 13, 2022
• Oct 5: PNS22-62: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on October 11, 2022
• Oct 4: PNS22-61: Soliciting Comments on the Removal of WSR-88D Legacy Precipitation Processing System (PPS) Products October 4, 2022 through November 18, 2022
• Oct 16, 2024: PNS22-10 Updated: Soliciting Comments until May 31, 2025 on Snow Ratio Grids as an Experimental Element in the National Digital Forecast Database (NDFD)
• Oct 3: PNS19-02 Updated: Soliciting Comments until April 30, 2023 on Addition of Probabilistic Snow Grids for Select Weather Forecast Offices (WFOs) as an Experimental Element in the National Digital Forecast Database (NDFD) for the Contiguous United States (CONUS)
• Oct 20: PNS14 Updated: Soliciting Comments until April 30, 2024 on the Continuation of the Probabilistic Winter Precipitation Forecast Experiment
• Sep 27: PNS22-49 Updated: Soliciting Comments on Experimental Coastal Waters Forecast Wave Component Update through July 31, 2023
• Sep 21: PNS22-60: Soliciting Public Comments through November 17, 2022 on the Provision of Post-Tropical Cyclone Event Observational Data through “Tropical Event Summary” Webpages
• Sep 15: PNS22-59: Soliciting Comments on Proposed Methods to Update the National Precipitation Frequency Standard through November 15, 2022
• Sep 12: PNS22-58: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on September 20, 2022
• Sep 12: PNS22-57: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on September 22, 2022
• Aug 1: PNS22-56 Updated: Soliciting Comments through January 31, 2024 for the Experimental Global Tropics Hazards Outlook for Week-3
• Sep 8: PNS22-09 Updated: Public Webpages for RIDGE II Local Standard Radar (Low Bandwidth) Images: Effective on or about September 8, 2022
• Sep 1: PNS20-36 Updated: Soliciting Public Comments through November 30, 2022 on an Experimental Graphic that Depicts the Peak Storm Surge Forecast from the Tropical Cyclone Public Advisory Product when Storm Surge Watch/Warnings are in Effect
• Sep 25, 2024: PNS22-55 Updated: Soliciting Comments on Experimental Flood Inundation Mapping (FIM) Services through September 30, 2025
• Aug 15: PNS22-54: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing August 15, 2022
• Aug 9: PNS22-53: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on August 15, 2022
• Aug 9: PNS22-52: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on August 15, 2022
• Aug 9: PNS22-17 Updated: Changes in Weather Balloon Launch Frequency on August 9, 2022
• Aug 8: PNS22-51: Soliciting Comments on NWS Western Region HeatRisk Prototype through September 30, 2022
• Aug 1: PNS22-50: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing August 2, 2022, with Backup Date Scheduled for August 3, 2022
• Sep 27: PNS22-49 Updated: Soliciting Comments on Experimental Coastal Waters Forecast Wave Component Update through July 31, 2023
• Aug 1: PNS22-48: Soliciting Comments on MDL-maintained P-Surge, P-ETSS, ETSS, and ESTOFS Websites through January 31, 2023
• Jul 20: PNS22-47: Seeking Public Comment on the Prototype NHC YouTube Live Streaming through November 30, 2022
• Jul 18: PNS22-46: Soliciting Public Comments on Changes to Products Produced From the Global Forecast System (GFS) through August 17, 2022
• Jul 15: PNS22-45: Soliciting Comments on Experimental Tropical Cyclone Discussion (TCD) and Tropical Cyclone Forecast/Advisory (TCM) Products for TC Forecasts Originating from the Weather Prediction Center (WPC) through November 30, 2022
• Jul 15: PNS22-44: Soliciting Comments on Experimental Tropical Cyclone (TC) Track and Watch/Warning Graphics (i.e., “Cone Graphics”) for TC Forecasts Originating from the Weather Prediction Center (WPC) through November 30, 2022
• Sep 25, 2024: PNS22-43 Updated: Extending Comment Period on the National Water Center's Experimental Area Hydrologic Discussion Product through June 30, 2025
• Jul 5: PNS20-28 Updated: Soliciting Comments on the Experimental National Water Center Visualization Services through December 31, 2022
• Apr 27, 2023: PNS21-02 Updated: Soliciting Comments on the Experimental National Hydrologic Discussion through June 30, 2024
• Sep 25, 2024: PNS22-42 Updated: Soliciting Comments on the Experimental Flood Hazard Outlook (FHO) Product through June 30, 2025
• Jul 5: PNS22-34 Updated: Soliciting Comments on the Proposed Upgrade of the GEFS-Aerosol Ensemble Member through July 31, 2022
• Jun 30: PNS21-21 Updated: Soliciting Comments through May 31, 2023 on Experimental Arrival of Tropical-Storm-Force Winds Graphics for the South Pacific and Western North Pacific Produced by the Central Pacific Hurricane Center (CPHC) Based on Forecasts from the Joint Typhoon Warning Center (JTWC)
• Jun 30: PNS21-19 Updated: Soliciting Comments through May 31, 2023 on Experimental Track and Error Cone Graphics Produced by the Central Pacific Hurricane Center for Tropical Cyclones in the South Pacific and Western North Pacific Basins Based on Forecasts Issued by the Joint Typhoon Warning Center
• Jun 30: PNS21-20 Updated: Soliciting Comments through May 31, 2023 on Experimental Wind Speed Probability Graphics Produced by the Central Pacific Hurricane Center for Tropical Cyclones in the South Pacific and Western North Pacific Basins Based on Forecasts Issued by the Joint Typhoon Warning Center
• Jun 29: PNS22-19 Updated: Soliciting Comments through October 31, 2022 on Website Upgrade for www.aviationweather.gov
• Apr 22: PNS22-41: Updated: Soliciting Comments through October 31, 2024 on Expansion of Experimental Surf Forecast Matrix to 7 WFOs
• Jun 28: PNS22-40: Soliciting Comments through July 27, 2022 on the Proposed Termination of the Week-1 Portion of the Climate Prediction Center Global Tropics Hazards Outlook
• Jun 28: PNS22-39: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on July 7, 2022
• Jun 28: PNS22-38: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on July 5, 2022
• Jun 28: PNS22-37 Updated: Soliciting Comments on the Upgrade of the Surge and Tide Operational Forecast System (STOFS, formerly ESTOFS) to Version 1.0.1 through September 1, 2022
• Aug 20, 2024: PNS22-36 Updated: Extending Comment Period on Experimental Potential Coastal Flood Extent Overlays until August 30, 2025
• Jun 21: PNS22-35: Soliciting Comments on the Proposed Upgrade of the HYSPLIT v8.0 through July 31, 2022
• Jul 5: PNS22-34 Updated: Soliciting Comments on the Proposed Upgrade of the GEFS-Aerosol Ensemble Member through July 31, 2022
• Jun 7: PNS22-33: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing June 7, 2022, with Backup Dates Scheduled for June 8 and June 14, 2022
• May 27: PNS22-32: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on June 2, 2022
• May 27: PNS22-31: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast in Conjunction with the LANTEX22 Tsunami Exercise on June 1, 2022
• May 26: PNS22-30: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing May 26, 2022
• May 23: PNS22-29: Soliciting Comments on the Experimental Implementation of Ceiling, Visibility and Low Level Wind Shear (LLWS) Grids in NDFD from May 23, 2022 through May 23, 2023
• May 12: PNS22-28: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast on May 19, 2022
• May 12: PNS22-27: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on May 17, 2022
• Sep 1: PNS20-36 Updated: Soliciting Public Comments through November 30, 2022 on an Experimental Graphic that Depicts the Peak Storm Surge Forecast from the Tropical Cyclone Public Advisory Product when Storm Surge Watch/Warnings are in Effect
• Dec 13: PNS22-26 Updated: Soliciting Comments through July 31, 2023 on the “Rapid Onset Drought” Hazard Type as an Experimental Element Within the 8- to 14-Day Hazards Outlook (Contiguous U.S. and Alaska)
• May 2: PNS22-25: Hurricane Threats and Impacts (HTI) Mosaic Testing on May 3, 2022 (Backup Dates: May 4-5, 2022)
• Apr 28: PNS21-05 Updated: Comment Period on the Prototype Provision of Full-Resolution National Digital Forecast Database (NDFD) Data via Amazon Web Services (AWS) Extended through April 28, 2023
• Apr 27: PNS21-53 Updated: Comment Period on the Experimental National GIS Map Viewer (“The Viewer”) Web Application Extended through May 27, 2022
• Apr 27: PNS22-24: Public Comment Period for the Discontinuation of NWS Honolulu’s Route Forecast May 2 – June 30, 2022
• Apr 25: PNS22-23: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing April 25-29, 2022
• Apr 7: PNS22-22: Soliciting Comments on the Experimental Day 3-7 Temperature Anomaly Graphics through July 10, 2022
• Apr 4: PNS22-21: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on April 7, 2022
• Apr 1: PNS22-20: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on April 4, 2022
• Jun 29: PNS22-19 Updated: Soliciting Comments through October 31, 2022 on Website Upgrade for www.aviationweather.gov
• Oct 30, 2023: PNS22-18 Updated: Weather Forecast Office (WFO) Guam to Produce Experimental Public and Marine Grids for East and West Micronesia for Inclusion into the National Digital Forecast Database: Effective March 29, 2022
• Aug 9: PNS22-17 Updated: Changes in Weather Balloon Launch Frequency on August 9, 2022
• Mar 29: PNS22-16: Second Delay of the Spring 2022 Forecast Zones Implementation Date to April 5, 2022 Due to a Critical Weather Day (CWD) Declaration
• Mar 21: PNS22-15: Delay of the Spring 2022 Forecast Zones Implementation Date to March 29, 2022 Due to a Critical Weather Day (CWD) Declaration
• Mar 15: PNS22-14: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on March 18, 2022 
• Mar 10: PNS22-13: Modified National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on March 14, 2022
• Mar 1: PNS22-12 Updated: Enhancements to the Experimental Probabilistic Winter Storm Severity Index (PWSSI): Effective October 11, 2022
• Jan 25, 2023: PNS22-11 Updated: Soliciting Comments on Experimental Excessive Rainfall Outlook for Days 4-5 through February 26, 2023
• Oct 16, 2024: PNS22-10 Updated: Soliciting Comments until May 31, 2025 on Snow Ratio Grids as an Experimental Element in the National Digital Forecast Database (NDFD)
• Sep 8: PNS22-09 Updated: Public Webpages for RIDGE II Local Standard Radar (Low Bandwidth) Images: Effective on or about September 8, 2022
• Feb 10: PNS22-08: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on February 17, 2022
• Feb 10: PNS22-07: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on February 15, 2022
• Jan 26: PNS19-01 Updated: Soliciting Public Comments on Experimental Probabilistic Flood Outlook Summary through May 31, 2023
• Jan 26: PNS22-06: Level III Base Radial Velocity Radar Product will be Unavailable on NWS Radar Webpage on or around February 2, 2022
• Jan 24: PNS22-05: Soliciting Comments on the Proposal Implementation of the National Gridded Snowfall Analysis until February 23, 2022
• Jan 20: PNS22-04: New and Existing NWS On-Premise GIS Web Services Hosted on the AWS Public Cloud on or about January 20, 2022​
• Jan 7: PNS22-03: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on January 13, 2022
• Jan 7: PNS22-02: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on January 11, 2022
• Jan 4: PNS22-01: Soliciting Comments on the Upgrade of the National Blend of Models and GFS MOS Guidance through April 8, 2022

Public Information Statements 2021

• Dec 10: PNS21-73: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on December 16, 2021
• Dec 10: PNS21-72: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on December 14, 2021
• Dec 10: PNS21-71: Soliciting Public Comments through May 31, 2022, on Intense Rainfall and Flash Flood Reports Webpage
• Dec 7: PNS21-70: Soliciting Public Comments on the Replacement of Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) Forecast Smoke Products with Rapid Refresh (RAP) Smoke Forecast Products through January 6, 2022
• Dec 7: PNS21-69: Soliciting Comments on a Proposal to Nationally Expand Partial County Alerting via NWR and EAS for Select Counties through March 1, 2022
• Dec 1: PNS15hefs Updated: Extending Public Comment Period on Experimental Short Range River Forecast Uncertainty Graphic through January 15, 2022
• Oct 15, 2024: PNS21-68 Updated: Soliciting Comments on the Experimental Standardized Weather Forecast Office (WFO) Avalanche Weather Webpage at 18 WFOs through April 30, 2025 
• Nov 18: PNS21-67: Soliciting Comments on the Consolidation of Hard Freeze and Freeze Headlines through December 18, 2021
• Nov 2: PNS15 Updated: Soliciting Comments through April 15, 2022 on the Days 3-7 Winter Storm Threat Index from NWS Weather Forecast Offices (WFOs) Baltimore, MD/Washington, DC; State College, PA and Wakefield, VA
• Oct 28: PNS21-66: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on November 4, 2021
• Oct 28: PNS21-53 Updated: Comment Period on the Experimental National GIS Map Viewer (“The Viewer”) Web Application Extended Through May 27, 2022
• Oct 27: PNS21-65: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on November 2, 2021
• Oct 7, 2024: PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2025
• Nov 22, 2022:  PNS15 Updated: Comment Period Extended through April 30, 2023 on the Experimental Lake Effect Snow (LES) Warning Polygons from NWS Weather Forecast Offices (WFOs) Buffalo, NY; Binghamton, NY and Albany, NY
• Oct 8: PNS21-64: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on October 14, 2021
• Oct 7: PNS21-63: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on October 12, 2021 
• Sep 30: PNS21-62: Soliciting Comments through October 30, 2021 on Terminating the Legacy Wang Sheeley Arge Website at the Space Weather Prediction Center
• Sep 30: PNS21-61: Soliciting Public Comments through November 19, 2021 on Replacing the Observational Content of the Current Post Tropical Cyclone Report (PSH) Text Product with a Comma-Separated Values (CSV) File
• Sep 14: PNS18-28 Updated: Soliciting Comments on the Experimental Avalanche Weather Guidance Product through April 30, 2022
• Sep 8: PNS21-60: Seeking Comments through October 8, 2021 on Changing the Geographic Coverage of GOES-R SCMI Data Available via the Satellite Broadcast Network
• Sep 7: PNS19-05 Updated: Expanding and Extending the Experimental Comment and Review of the NWS use of Live Video Streaming via Facebook Live and Twitter Live through April 28, 2022
• Sep 3: PNS21-59: Soliciting Comments until October 15, 2021 on the Proposed Use of Impact-Based Warning Tags for Snow Squall Warnings and Proposed Changes to Wireless Emergency Alerts for Snow Squall Warnings
• Sep 2: PNS21-58: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on September 9, 2021
• Aug 30: PNS21-57: Soliciting Comments until April 30, 2022 on the Experimental Winter Storm Severity Index (WSSI) Day 4 Extension
• Aug 13: PNS21-56: Change to Web Access URL for NWS Text-based Climate Information as of August 26, 2021
• Aug 11: PNS21-45 Updated: Soliciting Comments on the Migration of the NWSChat Application from August 11, 2021 through August 27, 2021
• Aug 4: PNS21-55: Soliciting Comments on a Change to NEXRAD Product Dissemination via NOAAPort/SBN on December 1, 2021
• Jul 30: PNS21-54: Nationwide Emergency Alert System Test and Wireless Emergency Alert Test Scheduled for August 11, 2021
• Apr 27, 2022: PNS21-53 Updated: Comment Period on the Experimental National GIS Map Viewer (“The Viewer”) Web Application Extended Through May 27, 2022
• Jul 28: PNS21-52: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on August 5, 2021
• Jul 28: PNS21-51: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on August 3, 2021
• Jul 20: PNS21-50: Name of the Caribbean Tsunami Warning Program (CTWP) Changed to International Tsunami Information Center (ITIC) Caribbean Office Beginning September 1, 2021
• Jul 19: PNS21-49: Soliciting Comments until September 17, 2021 on the Proposed Expansion of the Marine Channels Forecast to Mobile Bay, AL
• Jul 13: PNS21-48: Spanish-Language Survey Now Available as NWS Solicits Comments through July 31, 2021 on Proposed New Headline Language to Replace Current "Advisories" and "Special Weather Statements"
• Jul 12: PNS21-47: Tropical Cyclone Watch/Warning Product (TCV) Collaboration Testing July 13-14, 2021
• Jul 9: PNS21-46: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to take place on July 15, 2021
• Aug 11: PNS21-45 Updated: Soliciting Comments on the Migration of the NWSChat Application from August 11, 2021 through August 27, 2021
• Jul 8: PNS21-44: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on July 13, 2021
• Jun 25: PNS21-43: Soliciting Comments on the Experimental Enhanced Version of the National Weather Service Extreme Precipitation Monitor (EPM) through July 30, 2021
• Jun 21: PNS21-42: Hurricane Threats and Impacts (HTI) Mosaic Testing at WFOs San Diego (SGX) and Los Angeles, CA (LOX) on June 22, 2021
• Jun 17: PNS21-41: Soliciting Comments through July 31, 2021 on Proposed New Headline Language to Replace Current "Advisories" and "Special Weather Statements"
• Jun 16: PNS21-40: Soliciting Comments through July 31, 2021 on Discontinuing the Satellite-Interpretation Message (SIM) from Weather Forecast Office Guam and Replacing it with the Tropical Weather Discussion (TWD)
• Jun 15: PNS21-39: Soliciting Comments on Proposal to Discontinue Small Craft Exercise Caution Headline through August 13, 2021
• Jun 4: PNS21-38: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on June 10, 2021
• Jun 3: PNS21-37: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on June 8, 2021
• Jun 2: PNS21-36: Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing Thursday, June 3, 2021
• May 28: PNS21-35: Soliciting Comments on the Use of the Short Term Forecast Product (NOW) through June 27, 2021
• May 26: PNS21-34: Soliciting Comments on the Prototype Flood Hazard Outlook Product through October 31, 2021
• May 17: PNS21-33: Tropical Cyclone Data Flow Testing Tuesday, May 18, 2021
• Sep 1, 2022: PNS20-36 Updated: Soliciting Public Comments through November 30, 2022 on an Experimental Graphic that Depicts the Peak Storm Surge Forecast from the Tropical Cyclone Public Advisory Product when Storm Surge Watch/Warnings are in Effect
• May 6: PNS21-32: Seeking Comments from Users on Providing NCEP NWP Data in the Cloud through July 31, 2021
• May 4: PNS21-31: Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing Wednesday May 5, 2021
• May 4: PNS21-30: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on May 6, 2021
• May 3: PNS21-29: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on May 5, 2021
• May 3: PNS21-28: Seeking Feedback on Proposed Wireless Emergency Alerts Messages for Severe Thunderstorm Warnings with the Destructive Damage Threat Categorizations through June 2, 2021
• May 3: PNS21-27: Incorrectly Classified as a PNS; see SCN21-27A
• Apr 20: PNS19-29 Updated: Soliciting Comments on the Experimental Water Information Interface Webpage until December 31, 2021
• Apr 13: PNS21-26: Announcing Four Partner Webinars on the Planned Major Change to NWS' Hazard Messaging Headlines in May
• Apr 7: PNS21-25: Hurricane Threats and Impacts (HTI) Mosaic Testing on April 8, 2021 (Backup Date: April 22, 2021)
• Apr 5: PNS21-24: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on April 7, 2021
• Apr 2: PNS21-23: Soliciting Comments through May 1, 2021 on the Removal of Low Resolution Products from SBN/NOAAPort
• Apr 2: PNS21-22: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on April 6, 2021
• Jun 30, 2022: PNS21-21 Updated: Soliciting Comments through May 31, 2023 on Experimental Arrival of Tropical-Storm-Force Winds Graphics for the South Pacific and Western North Pacific Produced by the Central Pacific Hurricane Center (CPHC) Based on Forecasts from the Joint Typhoon Warning Center (JTWC)
• Jun 30, 2022: PNS21-20 Updated: Soliciting Comments through May 31, 2023 on Experimental Wind Speed Probability Graphics Produced by the Central Pacific Hurricane Center for Tropical Cyclones in the South Pacific and Western North Pacific Basins Based on Forecasts Issued by the Joint Typhoon Warning Center
• Jun 30, 2022: PNS21-19 Updated: Soliciting Comments through May 31, 2023 on Experimental Track and Error Cone Graphics Produced by the Central Pacific Hurricane Center for Tropical Cyclones in the South Pacific and Western North Pacific Basins Based on Forecasts Issued by the Joint Typhoon Warning Center
• Mar 25: PNS21-18: Static Radar Image Files Return to EMWIN Services March 24, 2021
• Mar 25: PNS21-17: Network Maintenance on Computers Running NEXRAD and TDWR National Level II Data March 27, 2021
• Mar 23: PNS21-16: National Tsunami Warning Center National Pacific Coast Exercise PACIFEX21 on March 24, 2021
• Mar 12: PNS21-15: National Tsunami Warning Center National East Coast Exercise LANTEX21 on March 17, 2021
• Mar 9: PNS21-14: Soliciting Comments on the Upgrade of the Global Extratropical Surge and Tide Operational Forecast System (Global ESTOFS) to Version 2.0.1 through April 8, 2021
• Mar 8: PNS21-13: Soliciting Public Comments on the Proposed Upgrade of the CMAQ through April 5, 2021
• Mar 4: PNS21-12: Planned Major Change to NWS' Hazard Messaging Headlines No Earlier Than Calendar Year 2024
• Feb 16: PNS21-11: Soliciting Comments through April 21, 2021 on Proposal to Discontinue Small Craft Exercise Caution Headline
• Feb 16: PNS21-10: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on February 17, 2021
• Feb 10:  PNS21-09: Soliciting Comments on Discontinuing the OPC Marine Weather Discussion (MIM): Effective March 12, 2021
• Mar 26: PNS21-08 Updated: Dissemination Testing for the Center Weather Advisory During the Month of March 2021
• Feb 8: PNS21-07: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on February 10, 2021
• Feb 5: PNS21-06: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on February 9, 2021
• Apr 28, 2022: PNS21-05 Updated: Comment Period on the Prototype Provision of Full-Resolution National Digital Forecast Database (NDFD) Data via Amazon Web Services (AWS) Extended through April 28, 2023
• Jan 28: PNS21-04: Soliciting Comments through February 28, 2021 on Discontinuing the Marine Weather Discussion Text Product 
• Jan 9: PNS21-03: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on January 14, 2020
• Apr 27, 2023: PNS21-02 Updated: Soliciting Comments on the Experimental National Hydrologic Discussion through June 30, 2024
• Jan 8: PNS21-01: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on January 12, 2021
• Jan 8: PNS20-28 Updated: Soliciting Comments on the Experimental National Water Center Visualization Services through December 31, 2022

For older PNSs, SCNs and TINs, go to https://www.weather.gov/notification/archive

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Service Change Notices 2024

• Dec 20: SCN24-109: Discontinuation of the Max/Min Temperature and Precipitation Table Product for all NWS Central Region Offices: Effective January 31, 2025
• Dec 20: SCN24-108: Termination of the 72-Hour Low Tracks Graphic and the Non-Technical 72-Hour Low Tracks Graphic to be Replaced by Automated Low Clusters Forecast Tool: Effective January 20, 2025
• Dec 20: SCN24-107: Discontinuation of Haines Index and Lightning Activity Level (LAL) as Fire Weather Forecast Elements in Fire Weather Products: Effective on or about February 1, 2025
• Dec 18: SCN24-106 Updated: RESCINDED: Discontinuation of Terminal Aerodrome Forecast (TAF) Service for Anniston Regional Airport in Anniston, AL (KANB)
• Dec 18:  SCN24-105 Updated: Operational Implementation of Key Messages on or about January 16, 2025 
• Dec 16: SCN24-104: The Experimental Weeks 3-4 Precipitation Outlooks Will Become Operational on or about January 17, 2025
• Dec 12: SCN24-99 Updated: Addition of SAUS99 and SPUS99 Text Products to Satellite Broadcast Network (SBN) and Removal of the SAUS70, 80  and 90 Counterparts on or about January 27, 2025
• Nov 19: SCN24-103: Update to the Marine Beach Forecast Summary Service: Effective on or after December 16, 2024
• Nov 15: SCN24-102: Addition of Avalanche Warning for the San Francisco Peaks and Kachina Peaks Wilderness in Arizona beginning December 16, 2024
• Oct 29: SCN24-101: Minor RTMA and URMA Upgrade to Version 2.10.9 (RTMA) and 2.10.7 (URMA): Effective on October 29, 2024
• Oct 21: SCN24-100: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective December 9, 2024
• Dec 12: SCN24-99 Updated: Addition of SAUS99 and SPUS99 Text Products to Satellite Broadcast Network (SBN) and Removal of the SAUS70, 80  and 90 Counterparts on or about January 27, 2025
• Oct 18: SCN24-98: The Coastal Waters Forecast Product from the Weather Forecast Office (WFO) in Guam Will Include Additional Wave Information on or about November 4, 2024
• Oct 17: SCN24-97: Addition of National Fire Danger Rating System (NFDRS) Forecasts from the National Weather Service (NWS) Honolulu Forecast Office (HFO): Effective Immediately
• Oct 15: SCN24-96: Improvements Made to the World Coordinate System Metadata in GONG H-Alpha Imagery on or about October 16, 2024
• Oct 15: SCN24-95: Changes to NOAA Weather Radio All Hazards (NWR) Radio Frequency for Safford, AZ (KXI24): Effective on or about November 18, 2024
• Oct 2: SCN24-69 Updated: Changes to Public Forecast Zones for WFO Seattle, WA: Effective March 2025
• Oct 1: SCN24-94: Upgrade of the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0.8: Effective October 1, 2024
• Oct 1: SCN24-93: Discontinuation of the Texas/Oklahoma Panhandles Supplementary Observations (AGO) Product: Effective October 31, 2024
• Sep 26: SCN24-92: Retirement of the Airmen’s Meteorological Information (AIRMET) over CONUS: Effective on or about January 27, 2025
• Sep 26: SCN24-91: Termination of Terminal Aerodrome Forecast (TAF) at Troy Municipal Airport, Troy, AL (KTOI): Effective on or around October 1, 2024
• Sep 24: SCN24-80 Updated: Changes and Additions to LAMP Station-based and Gridded Guidance: Effective on or about September 30, 2024
• Sep 23: SCN24-90: Changes to the Atlantic Tropical Weather Discussion Issuance Times: Effective on or about December 2, 2024
• Sep 16: SCN24-89: Upgrade of the Real Time Ocean Forecast System (RTOFS) to Version 2.4: Effective September 13, 2024
• Sep 10: SCN24-77 Updated: NOS Operational Forecast System (OFS) Framework Version Updates and Implementation of Oceanographic Forecast Modeling Systems for the Salish Sea and Columbia River: Effective on or about September 16, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Sep 5: SCN24-88: Renaming of Excessive Heat Watch and Warning to Extreme Heat Watch and Warning: Effective March 4, 2025
• Sep 3: SCN24-87: Addition of NWS Common Alerting Protocol version 1.2 messages to NOAA Weather Wire Service Open Interface (NWWS-OI): Effective on or around September 3, 2024
• Aug 29: SCN24-75 Updated: Changes in NWS Hazard Map Warning, Watch, Advisory (WWA) Colors and Priorities: Effective October 1, 2024 
• Aug 29: SCN24-86: Implementation of TAF Service for Half Moon Bay Airport (KHAF) in California: Effective October 22, 2024
• Aug 28: SCN24-85: Updated PROB30 Usage in the Terminal Aerodrome Forecast (TAF): Effective on or about September 30, 2024
• Aug 27: SCN24-84: Two New NOAA Weather Radio All Hazards (NWR) Transmitters in the Texas Panhandle become operational: Effective on or about October 1, 2024
• Aug 27: SCN24-83: New NOAA Weather Radio All Hazards (NWR) Broadcast begins from Station WZ2559, Enterprise, Oregon: Effective on or about October 1, 2024
• Oct 2: SCN24-69 Updated: Changes to Public Forecast Zones for WFO Seattle, WA: Effective March 2025
• Sep 24: SCN24-80 Updated: Changes and Additions to LAMP Station-based and Gridded Guidance: Effective on or about September 30, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Aug 20: SCN24-72 Updated: Weather Surveillance Radar-1988 Doppler (WSR-88D) RDA/RPG Build 23.0 Beta Test to Begin the Week of August 25, 2024
• Aug 20: SCN24-68 Updated: Changes to Fire Weather Forecast Zones for WFO Pendleton, OR: Effective March 2025 
• Aug 20: SCN24-70 Updated: Changes to Public Weather Forecast Zones for WFO Anchorage, AK: Effective March 2025
• Aug 20: SCN24-82: Experimental Global Tropics Hazards Outlook for Week-3 will Transition to Operational Status on September 19, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Aug 14: SCN24-81: Implementation of TAF Service for the South Valley Regional Airport (KSVR) in Utah: Effective October 29, 2024
• Sep 24: SCN24-80 Updated: Changes and Additions to LAMP Station-based and Gridded Guidance: Effective on or about September 30, 2024
• Aug 5: SCN24-79: Deployment of an Update to the GOES Proton Flux Plot on or about August 6, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Aug 2: SCN24-78: The National GIS Map Viewer (the “Viewer”) Marine Program Site will become Operational: Effective on or about Monday, August 5, 2024
• Sep 10: SCN24-77 Updated: NOS Operational Forecast System (OFS) Framework Version Updates and Implementation of Oceanographic Forecast Modeling Systems for the Salish Sea and Columbia River: Effective on or about September 16, 2024
• Jul 29: SCN24-76: Notification of Upgrade to the Model Analyses and Guidance (MAG) Website to Version 5.1: Effective July 30, 2024
• Aug 29: SCN24-75 Updated: Changes in NWS Hazard Map Warning, Watch, Advisory (WWA) Colors and Priorities: Effective October 1, 2024 
• Jul 19: SCN24-74: Initiation of an Afternoon Issuance of the Day 3 Convective Outlook, Issued by the NWS Storm Prediction Center: Effective on or about August 20, 2024
• Jul 10: SCN24-73: Change to NEXRAD Level III Product Dissemination on or around September 16, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Aug 20: SCN24-72 Updated: Weather Surveillance Radar-1988 Doppler (WSR-88D) RDA/RPG Build 23.0 Beta Test to Begin the Week of August 25, 2024
• Jul 3: SCN24-71: Upgrade to RIDGE II (radar.weather.gov) Enhanced and Standard (Low Bandwidth) Images: Effective July 2, 2024
• Aug 20: SCN24-70 Updated: Changes to Public Weather Forecast Zones for WFO Anchorage, AK: Effective March 2025
• Jun 27: SCN24-65 Updated: Upgrade NCEP Global Forecast System to v16.3.16: Effective July 2, 2024
• Aug 20: SCN24-70 Updated: Changes to Public Weather Forecast Zones for WFO Anchorage, AK: Effective March 2025
• Oct 2: SCN24-69 Updated: Changes to Public Forecast Zones for WFO Seattle, WA: Effective March 2025
• Aug 20: SCN24-68 Updated: Changes to Fire Weather Forecast Zones for WFO Pendleton, OR: Effective March 2025 
• Jun 26: SCN24-67: Decommissioning of w2.weather.gov on or about July 23, 2024
• Jun 24: SCN24-66: Termination of the Day 3-7 Hemispheric Charts: Effective July 24, 2024
• Jun 27: SCN24-65 Updated: Upgrade NCEP Global Forecast System to v16.3.16: Effective July 2, 2024
• Jun 13: SCN24-64: Upgrade to Hurricane Analysis and Forecast System (HAFS): Effective July 16, 2024
• Jun 1: SCN24-63: Decommissioning of the NOAA Profiler Network (NPN): Effective July 11, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• Jun 4: SCN24-44 Updated: Migrate NWS weather.gov Website to New Infrastructure and Decommission Websites/URLs: Effective June 4, 2024
• Jun 3: SCN24-50 Updated: Migration of JSON and DWML Data Services to NWS’s API Application at api.weather.gov and Removal from forecast.weather.gov: Effective TBD
• May 31: SCN24-62: Limiting Tropical Information in High Seas Forecasts from 120 Hours to Only the First 48 Hours: Effective June 26, 2024
• May 31: SCN24-61: Discontinuation of the Max/Min Temperature and Precipitation Table Product for all NWS Southern Region Offices: Effective July 1, 2024
• May 28: SCN24-60: New Data Available Publicly on NCEP Web Services: GFS, GDAS, and RAP BUFR Observations and US Navy HYCOM: Effective May 22, 2024
• May 22: SCN24-43 Updated: Migration of All Real-time LAMP and Gridded LAMP Webpages and One Storm Surge Webpage to New Web Server: Effective on or about June 10, 2024
• May 22: SCN24-59: Spot Application Upgrade: Effective June 25, 2024
• May 22: SCN24-58: NWS to Decommission the User-Defined Area Forecast (UDAF) Service and Webpage: Effective June 27, 2024
• May 21: SCN24-57: New NOAA Weather Radio All Hazards (NWR) Broadcast Begins from Station KAE42, Providence Forge, VA on June 21, 2024
• May 21: SCN24-56: National Tsunami Hazards Mitigation Program Website Will Move to New Web Address on or about June 19, 2024
• May 20: SCN24-55: Upgrade NWS API Website Forecast and Alerts Endpoints: Effective June 20, 2024
• Sep 9: SCN24-54 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN) Channel Alignment: Effective on or about September 16, 2024
• May 16: SCN24-53: Operational Implementation of the updated Electric Power Dashboard Webpage on or about May 16, 2024
• May 16: SCN24-52: The National GIS Map Viewer (the “Viewer”) Tropical Program Site Will Become Operational: Effective on or about May 21, 2024
• May 16: SCN24-51: NWS Mobile Site Decommissioning: Effective June 26, 2024
• Jun 4: SCN24-44 Updated: Migrate NWS weather.gov Website to New Infrastructure and Decommission Websites/URLs: Effective June 4, 2024
• Jun 3: SCN24-50 Updated: Migration of JSON and DWML Data Services to NWS’s API Application at api.weather.gov and Removal from forecast.weather.gov: Effective TBD
• May 3: SCN24-49: Termination of TPEX Introduction Webpage: Effective June 13, 2024
• May 2: SCN24-40 Updated: Upgrade of the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0: Effective on or about May 14, 2024
• May 2: SCN24-48: Cooperative Hurricane Upper Air Stations (CHUAS) to Transition from the GRAW DFM09 to the GRAW DFM17 (Capless) Radiosonde and Supporting Software Version by July 27, 2024
• May 2: SCN24-47: Moving Downtown Los Angeles, CA Weather Observations Site to the Frank Hotchkin Memorial Training Center on May 20, 2024
• May 2: SCN24-46: Correcting Station Locations for KGVW and MMML in the National Blend of Models (NBM) v4.1 Text Message Product: Effective April 29, 2024
• May 1: SCN24-45: Removal of Surface Observations from NWS API Website: Effective April 24, 2024
• Jun 4: SCN24-44 Updated: Migrate NWS weather.gov Website to New Infrastructure and Decommission Websites/URLs: Effective June 4, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• May 22: SCN24-43 Updated: Migration of All Real-time LAMP and Gridded LAMP Webpages and One Storm Surge Webpage to New Web Server: Effective on or about June 10, 2024
• Apr 17: SCN24-34 Updated: NOAA-21 NUCAPS Soundings to be Added to the Satellite Broadcast Network (SBN) on or near May 9, 2024
• Apr 16: SCN24-42: The “Rapid Onset Drought” Hazard Type Within the 8- to 14-Day Hazards Outlook (Contiguous U.S. and Alaska) Will Transition to Operational Status: Effective May 16, 2024
• Apr 11: SCN24-41: Upgrade of National Blend of Models Guidance: Effective May 15, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• May 2: SCN24-40 Updated: Upgrade of the National Air Quality Forecast Capability (NAQFC) to the Air Quality Modeling (AQM) System Version 7.0: Effective on or about May 14, 2024
• Apr 5: SCN24-39: Termination of the Hydrologic Summary (RVA): Effective April 16, 2024
• Apr 5: SCN24-38: Changes to the 24-Hour Surface and Wind and Wave Forecast Charts Issued by the Ocean Prediction Center: Effective on or around June 3, 2024
• Apr 4: SCN24-20 Updated: Provision of Full-Resolution National Digital Forecast Database (NDFD) Data and Air Quality National Digital Guidance Database (NDGD) via Amazon Web Services (AWS) Transitioning to Operational Status on or about April 17, 2024
• Apr 3: SCN24-37: Station Changes in GOES-R ASOS Satellite Cloud Products: Effective June 2, 2024
• Apr 3: SCN24-36: Upgrade to SPC Post Processing for NCEP Models: Effective May 7, 2024
• Apr 2: SCN24-35: Termination of Great Lakes Ice Concentration GRIB File: Effective May 1, 2024
• Apr 1: SCN24-32 Updated: Transition of NOAA Weather Wire Service Open Interface (NWWS-OI) to New Infrastructure: Effective April 23, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• Apr 17: SCN24-34 Updated: NOAA-21 NUCAPS Soundings to be Added to the Satellite Broadcast Network (SBN) on or near May 9, 2024
• Mar 26: SCN23-44 Updated: Implementation of Consolidated NWS Public Weather Program Products Related to Cold: Effective on or about October 1, 2024
• Mar 20: SCN24-33: Minor RTMA Upgrade to Version 2.10.7: Effective on or about April 08, 2024
• Apr 1: SCN24-32 Updated: Transition of NOAA Weather Wire Service Open Interface (NWWS-OI) to New Infrastructure: Effective April 23, 2024
• Mar 20: SCN24-31: Reinstatement of Marine Local Storm Report Event Types on or about March 26th, 2024
• Mar 11: SCN24-30: Upgrade NWS Forecast and Marine Weather Websites to New Infrastructure and Decommission Spanish Translation Webpages: Effective April 30, 2024, with a 7-hour Test on April 11, 2024
• Mar 6: SCN24-29: Changes to Uniform Resource Locators (URLs) Associated with the Operational Implementation of the National Water Prediction Service (NWPS) on March 27, 2024
• Mar 4: SCN24-28: Implementation of New Interactive Text Message Response System (ITMRS) for NOAA Weather Radio All Hazards (NWR): Effective April 4, 2024
• Feb 29: SCN24-27: The Modernized Drought Information Statement Will Transition to Operational Status: Effective April 1, 2024
• Feb 27: SCN24-26: Change in Issuing Office and Product Identifiers for Spanish-Translated Tropical Weather Outlooks and Tropical Cyclone Public Advisories for the Atlantic Basin on or around May 15, 2024
• Feb 26: SCN24-25: Changes to Issuance of U.S. Tropical Watches/Warnings on Intermediate Advisories, Inclusion of Links in the Tropical Cyclone Public Advisories, and Updates to the Time Zone Referenced in the Eastern Pacific Tropical Cyclone Forecast Products: Beginning May 15, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• Feb 23: SCN24-24: Changes to the host URLs for Hurricane Threats and Impacts (HTI) Graphics in Keyhole Markup Language (KML) Format: Effective Immediately
• Feb 23: SCN24-23: Changes to the Environmental Modeling Center Website with the Implementation of the Environmental Modeling Center Verification System (EVS) Version 1.0: Effective on or about March 26, 2024
• Apr 4: SCN24-20 Updated: Provision of Full-Resolution National Digital Forecast Database (NDFD) Data and Air Quality National Digital Guidance Database (NDGD) via Amazon Web Services (AWS) Transitioning to Operational Status on or about April 17, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• Feb 22: SCN24-22: NWS is Extending the 34- and 50-kt Wind Radii Forecasts from 3 Days to 5 Days in the Tropical Cyclone Forecast/Advisory Product (TCM): Effective on or about May 15, 2024
• Feb 22: SCN24-21: Minor RTMA Upgrade to Version 2.10.6: Effective on or about February 26, 2024
• Apr 4: SCN24-20 Updated: Provision of Full-Resolution National Digital Forecast Database (NDFD) Data and Air Quality National Digital Guidance Database (NDGD) via Amazon Web Services (AWS) Transitioning to Operational Status on or about April 17, 2024
• Feb 21: SCN24-19: The National Centers for Environmental Prediction (NCEP) Climate Prediction Center (CPC) will Change the Depiction and Output Formats of Several Ultraviolet Index (UVI) Product Graphics on or about May 25, 2024
• Feb 14: SCN24-18: Addition of HRRR and HRRRDAS files to NOMADS/FTPPRD Web Services: Effective February 14, 2024
• Feb 14: SCN24-17: The Coastal Waters Forecast with Experimental Wave Component Detail Will Expand to All Coastal NWS WFOs and Transition to Operational in a Phased Implementation from April through May 2024
• Feb 12: SCN24-16: National Hurricane Center (NHC) Tropical Cyclone JavaScript Object Notation File Changes: Effective on or about May 15, 2024
• Feb 9: SCN24-15: Notification of Upgrade to the Model Analyses and Guidance (MAG) Website to Version 5.0: Effective March 13, 2024
• Feb 7: SCN24-14: Metop-C NUCAPS Soundings to be Added to the Satellite Broadcast Network on or near March 8, 2024
• Feb 6: SCN24-13: The Pacific Tsunami Center Will Issue Tsunami Products with Updated Spanish Language Geographic Area Titles for Puerto Rico and the United States Virgin Islands and British Virgin Islands: Effective March 21, 2024
• Feb 6: SCN24-12: Termination of Old NWS Warnings Webpage: Effective March 5, 2024
• Jan 25: SCN24-11: Hammond, LA WSR-88D (KHDC) to Begin NEXRAD Level III Product Dissemination on or around March 31, 2024
• Jan 24: SCN24-10: The National Weather Service Began Operational Use of Inmarsat’s SafetyNET II for Broadcasts of METAREA IV and XII High Seas Forecasts and Warnings on January 22, 2024
• Jan 24: SCN24-09: Change to NEXRAD Level III Product Dissemination on or around March 4, 2024
• Jan 24: SCN24-08: Discontinuation of the 18Z issuance of the Regional Temperature and Precipitation Summary and rescheduling for 16Z on or about February 12, 2024 with COOP Reports Only
• Jan 23: SCN24-07: Aviation Tropical Cyclone Advisory (TCA) to Add a 6-hour Forecast: Beginning on or about May 15, 2024
• Jan 22: SCN23-121 Updated: alerts.weather.gov version 2.3.0 Upgrade: Effective on or about February 14, 2024
• Jan 18: SCN24-06: Discontinuing Dial-a-Buoy Interactive Voice Response System, Effective March 17, 2024
• Jan 18: SCN24-05: Automated Radiosonde Observing System (AROS) Sites to Transition from the Vaisala RS41-SGP Radiosonde to the RS41-SG Radiosonde by May 31, 2024
• Apr 22: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• Jan 16: SCN24-04: Updated Issuance Time and Format for the Tropical Weather Discussion (TWD) Issued Daily by WFO Guam: Effective on or about June 3, 2024
• Jan 12: SCN24-03: Replacement of the Advanced Hydrologic Prediction Service (AHPS) Website with the National Water Prediction Service (NWPS) Website on or about March 27, 2024
• Jan 11: SCN24-02: New Forecast Product “Offshore Waters Forecast for SW N Atlantic Ocean” Will Start on March 26, 2024
• Jan 3: SCN24-01: Approval of Service Description Document Version 2 Describing NWS Impact-based Decision Support Services: Effective January 3, 2024

Service Change Notices 2023

• Apr 22, 2024: SCN23-124 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS): Effective May 14, 2024
• Dec 21: SCN23-123: Implementation of Terminal Aerodrome Forecast (TAF) Service for KRGA - Central Kentucky Regional Airport, Richmond, KY: Effective March 5, 2024
• Dec 21: SCN23-122: NWS Alerts Atomic Syndication Format (ATOM) Data Changes: Effective on or about January 31, 2024
• Jan 22, 2024: SCN23-121 Updated: alerts.weather.gov version 2.3.0 Upgrade: Effective on or about February 14, 2024
• Dec 21: SCN23-120: Changes to Public and Fire Weather Forecast Zones for WFO Miami, FL: Effective March 5, 2024
• Dec 21: SCN23-119: Changes to Fire Forecast Zones for WFO Fairbanks, AK: Effective March 5, 2024
• Dec 21: SCN23-118: Changes to Fire Weather Forecast Zones for WFO Honolulu, HI: Effective March 5, 2024
• Dec 21: SCN23-117: Changes to Fire Weather Zones for WFO Portland, OR: Effective March 5, 2024
• Dec 21: SCN23-116: Changes to Public Forecast Zones for WFO Portland, OR: Effective March 5, 2024
• Dec 21: SCN23-115: Changes to Public and Fire Forecast Zones for WFO Jacksonville, FL: Effective March 5, 2024
• Dec 21: SCN23-114: Changes to Pacific Offshore Marine Forecast Zone Boundaries: Effective March 5, 2024
• Dec 21: SCN23-113: Refinements to Public, Marine, and Fire Weather Forecast Zones for WFO Juneau, AK: Effective March 5, 2024
• Dec 14: SCN23-112: Minor RTMA and URMA Upgrade to Version 2.10.5: Effective on or about January 24, 2023
• Dec 14: SCN23-111: Change to Global Aviation Products Related to the World Area Forecast System (WAFS) Product on or about January 17, 2024
• Dec 5: SCN23-110: Termination of Certain Web Graphics Being Produced by EMC: Effective January 5, 2024
• Nov 28: SCN23-109: Discontinuation of the Temperature and Precipitation Summary for Deep South Texas: Effective January 9, 2024
• Nov 28: SCN23-62 Updated: Temporary Removal of Canadian Radars from the Multi-Radar Multi-Sensor (MRMS) System: Effective June 5, 2023
• Nov 16: SCN23-73 Updated: Implementation of Partial County Alerting via NOAA Weather Radio All Hazards (NWR) and the Emergency Alert System (EAS) for Sonoma County, California: Effective on or after September 19, 2023
• Nov 16: SCN23-108: The Experimental Probabilistic Winter Storm Severity Index (WSSI-P) Will Become Operational on December 15, 2023
• Nov 16: SCN23-107: Discontinuation of the Experimental Lake Effect Snow (LES) Warning Polygons from NWS Weather Forecast Offices (WFOs) Buffalo, NY, Binghamton, NY and Albany, NY on or about December 16, 2023
• Nov 16: SCN23-106: Operational Implementation of Storm Prediction Center (SPC) Day 1 Convective Outlook with Severe Timing Guidance and Graphic Displays on or about December 16, 2023
• Nov 13: SCN23-105: NWS to Redirect and Decommission Enhanced Data Display: Effective November 29, 2023
• Nov 9: SCN20-80 Updated: Enhancements to the Winter Storm Severity Index: Effective November 9, 2023
• Nov 2: SCN23-104: Upgrade of the North American Ensemble Forecast System (NAEFS) to Version 7.0: Effective December 5, 2023
• Oct 25: SCN23-103: Discontinuation of the Max/Min Temperature and Precipitation Table Product for New Mexico: Effective Tuesday, December 5, 2023
• Oct 20: SCN23-93 Updated: GOES-East/West Cloud Cover Layers to be Added to the Satellite Broadcast Network on or after October 23, 2023
• Oct 19: SCN23-09 Updated: NWS Will Cease Dissemination of WSR-88D Legacy Precipitation Processing System (PPS) Products on or about September 27, 2023
• Oct 19: SCN23-102: Transition of the Radiosonde Replacement System (RRS) at Albany, NY to the 403 MHz Manual Radiosonde Observation System (MROS) on or about October 25, 2023
• Oct 16: SCN23-101: Termination of the Weather Prediction Center Day 3-7 Hazards Outlook Discussion: Effective November 15, 2023
• Oct 13: SCN23-100: Implementation of Terminal Aerodrome Forecast (TAF) Service for Durant Regional Airport – Eaker Field (KDUA), Durant OK: Effective November 1, 2023
• Oct 12: SCN23-99: Upgrade Ultraviolet Index (UVI) Forecast: Effective November 14, 2023
• Oct 6: SCN23-98: Discontinuation of the Experimental Days 3-7 Winter Storm Threat Index from NWS Weather Forecast Offices (WFOs) Baltimore, MD/Washington DC, State College, PA and Wakefield, VA on or about November 6, 2023
• Oct 2: SCN23-79 Updated: Upgrade of Aviation Weather Center Website on October 16, 2023
• Sep 28: SCN23-97: Deployment of and Update to the Kp>7 Warning to Remove the Adjectival Description on or about September 28, 2023
• Sep 28: SCN23-96: Change to NEXRAD Level III Product Dissemination on or around November 13, 2023
• Sep 28: SCN23-95: Hurricane Analysis and Forecast System Upgrades (HAFSv1.0.5): Effective October 4, 2023
• Sep 26: SCN23-94: Probabilistic Extra-Tropical Storm Surge (P-ETSS) Model Station Post-processing Updates: Effective September 27, 2023
• Oct 20: SCN23-93 Updated: GOES-East/West Cloud Cover Layers to be Added to the Satellite Broadcast Network on or after October 23, 2023
• Sep 11: SCN23-92: New Stations Added to GOES-R ASOS Satellite Cloud Products as of August 11, 2023
• Oct 2: SCN23-79 Updated: Upgrade of Aviation Weather Center Website on October 16, 2023
• Aug 31: SCN23-61 Updated: Changes to RIDGE II Enhanced (radar.weather.gov) and Standard (Low Bandwidth) Images Implemented on August 24, 2023
• Aug 29: SCN23-91: NWS to Replace Digital Marine Weather Dissemination System (DMAWDS) with New Ship Weather Observation Form: Effective September 28, 2023
• Aug 29: SCN23-90: Climate Prediction Center (CPC) Operational 6-10 Day and 8-14 Day Temperature and Precipitation Outlooks Maps Will Begin Including Hawaii on or about October 3, 2023 
• Aug 18: SCN23-76 Updated: Upgrade of National Water Model on NCEP’s WCOSS System and its Post-processing Application on the Integrated Dissemination Platform (IDP): Effective September 20, 2023
• Aug 14: SCN23-89: Experimental Deployment of International Civil Aviation Organization (ICAO) Space Weather Advisories on or about August 14, 2023
• Aug 31: SCN23-61 Updated: Changes to RIDGE II Enhanced (radar.weather.gov) and Standard (Low Bandwidth) Images Implemented on August 24, 2023
• Aug 9: SCN23-88: WSR-88D RDA/RPG Build 22.0 Beta Test to Begin on August 14, 2023
• Aug 1: SCN23-87: Corrections to Public and Fire Weather Forecast Zones for WFO Riverton, WY: Effective September 19, 2023
• Jul 28: SCN23-86: Removal of AutoNowCaster Products from the Multi-Radar, Multi-Sensor Application: Effective September 6, 2023
• Jul 27: SCN23-85: National Data Buoy Center (NDBC) will be Modifying the File Format and Filenames of Files Available for Download via Their Website: Effective on or about August 15, 2023
• Jul 27: SCN23-84: Termination of Certain Web Graphics Being Produced by EMC: Effective August 28, 2023
• Jul 24: SCN23-83: Implementation of TAF Service for Ontario Municipal Airport (KONO), Oregon: Effective September 12, 2023
• Aug 18: SCN23-76 Updated: Upgrade of National Water Model on NCEP’s WCOSS System and its Post-processing Application on the Integrated Dissemination Platform (IDP): Effective September 20, 2023
• Jul 19: SCN23-82: Changes to NWS Common Alerting Protocol (CAP) Message Availability via the Federal Emergency Management Agency (FEMA) Integrated Public Alert and Warning System (IPAWS): Effective on or after July 20, 2023
• Jul 18: SCN23-70 Updated: The Climate Prediction Center (CPC) Operational Drought Outlooks (DOs) will Begin Including the U.S. Virgin Islands on or about August 17, 2023
• Mar 26: SCN23-44: Updated: Implementation of Consolidated NWS Public Weather Program Products Related to Cold, Effective on or about October 1, 2024
• Jul 13: SCN23-81: Removal of the Radar Coded Message 74/RCM from RPCCDS on or about August 20, 2023 
• Jul 7: SCN23-72 Updated: Changes to Public Forecast Zones for WFO El Paso, TX: Effective September 19, 2023
• Jul 7: SCN23-80: Probabilistic Extra-Tropical Storm Surge (P-ETSS) Model Upgrade and Extra-Tropical Storm Surge (ETSS) Model Upgrade: Effective August 15, 2023
• Oct 2: SCN23-79 Updated: Upgrade of Aviation Weather Center Website on October 16, 2023
• Jun 29: SCN23-78: Changes to Public and Fire Weather Forecast Zones for WFO Fairbanks, AK: Effective September 19, 2023
• Jun 29: SCN23-77: Changes to Public Forecast Zones for WFO Anchorage, AK: Effective September 19, 2023
• Aug 18: SCN23-76 Updated: Upgrade of National Water Model on NCEP’s WCOSS System and its Post-processing Application on the Integrated Dissemination Platform (IDP): Effective September 20, 2023
• Jun 29: SCN23-75: Change to Fire Zone for WFO Pittsburgh, PA: Effective September 19, 2023
• Jun 29: SCN23-74: Changes to Public Forecast Zones for WFO Rapid City, SD: Effective September 19, 2023
• Nov 16: SCN23-73 Updated: Implementation of Partial County Alerting via NOAA Weather Radio All Hazards (NWR) and the Emergency Alert System (EAS) for Sonoma County, California: Effective on or after September 19, 2023
• Jul 7: SCN23-72 Updated: Changes to Public Forecast Zones for WFO El Paso, TX: Effective September 19, 2023
• Jun 29: SCN23-71: Discontinuation of NWS Honolulu, HI’s Route Forecast (ROFOR): Effective July 31, 2023
• Jul 18: SCN23-70 Updated: The Climate Prediction Center (CPC) Operational Drought Outlooks (DOs) will Begin Including the U.S. Virgin Islands on or about August 17, 2023
• Jun 26: SCN23-69: Implementation of the Upgrade of the Whole Atmosphere Model-Ionosphere Plasmasphere Electrodynamics Model (WAM-IPE) Forecast System (WFS) to Version 1.2: Effective August 1, 2023
• Jun 21: SCN23-68: Operational Implementation of the US-Canada 1D Geoelectric Model on June 21, 2023
• Jun 21: SCN23-67: NWSChat 2.0 Application will Transition to Operations on or about August 1, 2023
• Aug 10: SCN23-61 Updated: Changes to RIDGE II Enhanced (radar.weather.gov) and Standard (Low Bandwidth) Images on or about August 22, 2023
• Jun 13: SCN23-66: The National Weather Service Began Operational Use of Iridium’s SafetyCast for Broadcasts of METAREA IV and XII High Seas Forecasts and Warnings on June 12, 2023
• Jun 9: SCN23-65: Update and Migration of National Weather Service Products and Services Catalog: Effective June 9, 2023
• Jun 9: SCN23-64: NOAA-21 VIIRS Imagery to be Added to the Satellite Broadcast Network on or after July 10, 2023
• Jun 7: SCN23-63: JetStream - the National Weather Service Online Weather School URL Change: Effective June 7, 2023
• Nov 28: SCN23-62 Updated: Temporary Removal of Canadian Radars from the Multi-Radar Multi-Sensor (MRMS) System: Effective June 5, 2023
• Aug 31: SCN23-61 Updated: Changes to RIDGE II Enhanced (radar.weather.gov) and Standard (Low Bandwidth) Images Implemented on August 24, 2023
• May 25: SCN23-60: Go-Live of New NCEP Hurricane Model, HAFS and Future Decommissioning of Legacy Hurricane Systems: Effective June 27, 2023
• May 18: SCN23-31 Updated: Implementation of Mixed-Case Text/95 ASCII Character Set in Preliminary Local Storm Reports (LSRs) with Modified Event Types and Sources on or about May 31, 2023
• May 15: SCN23-59: Changes to ‘Alaska Weather’ Television Program and Soliciting Comments on Future Service Changes through July 30, 2023
• May 12: SCN23-58: Notification of Removal of AddThis from forecast.weather.gov and marine.weather.gov: Effective May 30, 2023
• May 10: SCN23-09 Updated: NWS will Cease Dissemination of WSR-88D Legacy Precipitation Processing System (PPS) Products on or about September 27, 2023
• May 4: SCN23-57: Termination of Common Alerting Protocol Version 1.1 (CAP v1.1): Effective no sooner than January 8, 2024
• May 4: SCN23-50 Updated: Changes to LAMP Station-Based and Gridded Guidance: Effective June 6, 2023
• May 4: SCN23-49 Updated: Changes to the GFS-based Model Output Statistics (MOS) Guidance: Effective June 6, 2023
• May 2: SCN23-42 Updated: Activation of GOES-East/West Ice and Snow Products on the Satellite Broadcast Network (SBN) on or after June 5, 2023
• May 2: SCN23-56: Notification of Upgrade to the Model Analyses and Guidance (MAG) Website to Version 4.0: Effective May 31, 2023
• May 1: SCN23-55: Operational Implementation of the Excessive Rainfall Outlook for Days 4-5 on or about June 1, 2023
• Apr 25: SCN23-54: Discontinuing Marine Service Chart MSC-15 for the Alaskan Waters: Effective April 26, 2023
• Apr 25: SCN23-53: Changes to the Weather Prediction Center Day 3-7 Hazards Outlook: Effective June 23, 2023
• Apr 24: SCN23-52: Correcting National Blend of Models (NBM) Low-Level Wind Shear (LLWS) Height Calculation, and Other Minor Fixes to NBM v4.1: Effective on or about April 25, 2023
• Apr 21: SCN23-46 Updated: Probabilistic Tropical Cyclone Storm Surge (P-Surge) Model Upgrade: Effective May 2, 2023
• Apr 20: SCN23-08 Updated: Change to Significant Meteorological Information (SIGMET) Format at a Date to be Determined
• Apr 19: SCN23-51: Discontinuing the Forecasts of High Pressure Systems in the High Seas Text Forecasts Issued by WFO Honolulu, HI and the Ocean Prediction Center: Effective May 17, 2023
• May 18: SCN23-31 Updated: Implementation of Mixed-Case Text/95 ASCII Character Set in Preliminary Local Storm Reports (LSRs) with Modified Event Types and Sources on or about May 31, 2023
• May 4: SCN23-50 Updated: Changes to LAMP Station-Based and Gridded Guidance: Effective June 6, 2023
• May 4: SCN23-49 Updated: Changes to the GFS-based Model Output Statistics (MOS) Guidance: Effective June 6, 2023
• Apr 10: SCN23-48: Termination of the Standard Data Format (SDF) and Sensor Observation Service (SOS) at NDBC: Effective June 24, 2023
• Apr 4: SCN23-35 Updated: Upgrade of the Great Lakes Waves-Unstructured Forecast System (GLWU) to Version 2.0.0: Effective May 9, 2023
• Apr 3: SCN23-47: Addition of Air Quality Alerts for the Metropolitan St. Louis, MO Area on or about May 3, 2023
• Apr 21: SCN23-46 Updated: Probabilistic Tropical Cyclone Storm Surge (P-Surge) Model Upgrade: Effective May 2, 2023
• Mar 30: SCN23-45: Meteorological Assimilation Data Ingest System (MADIS) Version 4.0.8 Upgrade: Effective March 29, 2023
• Mar 26, 2024: SCN23-44 Updated: Implementation of Consolidated NWS Public Weather Program Products Related to Cold: Effective on or about October 1, 2024
• Mar 30: SCN23-33 Updated: Addition of Record Event Report for Hastings, NE on or about April 3, 2023
• Mar 28: SCN23-14 Updated: Notification of Upgrade to the NCEP NOMADS Website to Version 2.2: Effective March 28, 2023
• Mar 27: SCN23-12 Updated: New Cloud-Based NOAA’s nowCOAST Map Viewer and Map Services: Effective April 3, 2023
• Mar 24: SCN23-43: NWS API Version 1.11.1 Upgrade on or around March 22, 2023
• May 2: SCN23-42 Updated: Activation of GOES-East/West Ice and Snow Products on the Satellite Broadcast Network (SBN) on or after June 5, 2023
• Mar 21: SCN23-41: Termination of the River and Lake Forecast Product (RVD): Effective April 21, 2023
• Mar 17: SCN23-40: NWS Alaska Pacific River Forecast Center Discontinuing the Alaska Recreational River Forecast on April 17, 2023
• Mar 17: SCN23-39: NWS Alaska Pacific River Forecast Center Will Update Graphical Flood Products in Alaska on April 17, 2023
• Mar 17: SCN23-38: Updates to the Aeronautical Fixed Telecommunications Network (AFTN) on or around April 17, 2023
• Mar 17: SCN23-37: Implementation of Terminal Aerodrome Forecast (TAF) Service for Hardy-Anders Field/Natchez-Adams County Airport (KHEZ), Natchez, MS: Effective June 13, 2023
• Mar 15: SCN23-36: Eastern Pacific National Tropical Cyclone Watch/Warning (TCV) Product Issued by the National Hurricane Center to Include Both Inland and Coastal Tropical Cyclone Wind Watches and Warnings: Beginning on or around June 15, 2023
• Apr 4: SCN23-35 Updated: Upgrade of the Great Lakes Waves-Unstructured Forecast System (GLWU) to Version 2.0.0: Effective May 9, 2023
• Mar 10: SCN22-77 Updated: Change to NOAAPort / Satellite Broadcast Network (SBN): Effective Early 2023
• Mar 28: SCN23-14 Updated: Notification of Upgrade to the NCEP NOMADS Website to Version 2.2: Effective March 28, 2023
• May 18: SCN23-31 Updated: Implementation of Mixed-Case Text/95 ASCII Character Set in Preliminary Local Storm Reports (LSRs) with Modified Event Types and Sources on or about May 31, 2023
• Mar 28: SCN23-14 Updated: Notification of Upgrade to the NCEP NOMADS Website to Version 2.2: Effective March 28, 2023
• Mar 1: SCN23-07 Updated: WSA-Enlil Heliospheric Model to Include Cessation of WSA Results Generated at 5Rs, Relocation of Time Series Acquisition Point from Earth to L1, and Improved WSA Results: Effective April 4, 2023
• Mar 1: SCN23-34: Change to the Transmission Deadline of the Weather Prediction Center QPF: Effective on March 1, 2023
• Mar 30: SCN23-33 Updated: Addition of Record Event Report for Hastings, NE on or about April 3, 2023
• Feb 28: SCN23-32: Removal of Watch Warning Advisory (WWA) Section at the Base of the NWS Weather Forecast Office (WFO) Anchorage, AK Area Forecast Discussion (AFD): Effective March 30, 2023
• Mar 27: SCN23-12 Updated: New Cloud-Based NOAA’s nowCOAST Map Viewer and Map Services: Effective April 3, 2023
• May 18: SCN23-31 Updated: Implementation of Mixed-Case Text/95 ASCII Character Set in Preliminary Local Storm Reports (LSRs) with Modified Event Types and Sources on or about May 31, 2023
• Feb 23: SCN23-30: Operational Implementation of Arrival of Tropical Storm-Force Winds Graphics for the South Pacific and Western North Pacific Based on Forecasts from the Joint Typhoon Warning Center (JTWC) on or around May 15, 2023
• Feb 23: SCN23-29: Operational Implementation of Wind Speed Probability Graphics for Tropical Cyclones in the South Pacific and Western North Pacific Basins based on Joint Typhoon Warning Center Forecasts on or around May 15, 2023
• Feb 23: SCN23-28: Extension of the Tropical Weather Outlook and Graphical Tropical Weather Outlook Issued by the National Hurricane Center and the Central Pacific Hurricane Center Out to 7 Days on or around May 15, 2023
• Feb 23: SCN23-27: Changes in County Forecasts and Warnings on NOAA Weather Radio All Hazards (NWR) Transmitters for Select Counties in South Carolina and Georgia: Effective March 30, 2023
• Feb 23: SCN23-26: Operational Implementation of Track and Error Cone Graphics for Tropical Cyclones in the South Pacific and Western North Pacific Basins Based on Forecasts Issued by the Joint Typhoon Warning Center: Effective on or about May 15, 2023
• Feb 23: SCN23-25: Expansion of the Potential Storm Surge Flooding Map to Puerto Rico and the U.S. Virgin Islands on or around May 15, 2023
• Feb 23: SCN23-24: Addition of Invest Identification Numbers to the Geographic Headers within the Tropical Weather Outlook Issued by the National Hurricane Center and the Central Pacific Hurricane Center on or around May 15, 2023
• Feb 23: SCN23-23: Removal of Watch/Warning Information from the Tropical Cyclone Forecast/Advisory (TCM) Product Issued by the National Hurricane Center and the Central Pacific Hurricane Center on or around May 15, 2023
• Feb 23: SCN23-22: Weather Forecast Offices San Diego and Los Angeles/Oxnard, CA To Begin Issuing the Tropical Cyclone Local Watch/Warning Product and Update the Hurricane Local Statement Product on or around May 15, 2023
• Feb 23: SCN23-21: Addition of the Extreme Wind Warning to the Suite of Tropical Products Issued by WFO Guam: Effective on or around May 15, 2023
• Feb 22: SCN23-20: Discontinuation of the Max/Min Temperature and Precipitation Table Product for Louisiana: Effective Thursday, March 23, 2023
• Feb 22: SCN23-19: Activation of Metop-C ASCAT Winds on the Satellite Broadcast Network on or about March 24, 2023 
• Feb 22: SCN23-18: Operational Tropical Cyclone Discussion (TCD) and Tropical Cyclone Forecast/Advisory (TCM) Products for Tropical Cyclone Forecasts Originating from the Weather Prediction Center: Effective on or about May 15, 2023
• Feb 22: SCN23-17: Provision of Post-Tropical Cyclone Event Observational Data on Tropical Event Summary Webpages: Beginning on or about May 15, 2023
• Feb 22: SCN23-16: Operational Implementation of the Peak Storm Surge Forecast Graphic from the National Hurricane Center on or about May 15, 2023
• Feb 22: SCN23-15: Addition of Air Quality Alerts for the State of Nebraska: on or about April 3, 2023
• Mar 28: SCN23-14 Updated: Notification of Upgrade to the NCEP NOMADS Website to Version 2.2: Effective March 28, 2023
• Feb 21: SCN23-13: Notification of Removal of Logs from NWS’s TGFTP: Effective March 7, 2023
• Mar 27: SCN23-12 Updated: New Cloud-Based NOAA’s nowCOAST Map Viewer and Map Services: Effective April 3, 2023
• Feb 16: SCN23-11: A New Version of NWS National Map Viewer (“The Viewer”) will be Released on or about April 3, 2023
• Feb 15: SCN22-119 Updated: Changes to Public and Fire Weather Forecast Zones for WFO Los Angeles/Oxnard, CA: Effective March 8, 2023
• Feb 14: SCN23-10: Implementation of Terminal Aerodrome Forecast (TAF) Service for Upper Cumberland Regional Airport (KSRB), Sparta, TN: Effective May 2, 2023
• Oct 19: SCN23-09 Updated: NWS Will Cease Dissemination of WSR-88D Legacy Precipitation Processing System (PPS) Products on or about September 27, 2023
• Mar 10: SCN22-77 Updated: Change to NOAAPort/Satellite Broadcast Network (SBN): Effective in Early 2023
• Apr 20: SCN23-08 Updated: Change to Significant Meteorological Information (SIGMET) Format at a Date to be Determined
• Jan 30: SCN22-112 Updated: Activation of GOES-R Geostationary Lightning Mapper Gridded Data Products on the Satellite Broadcast Network on or after March 6, 2023
• Mar 1: SCN23-07 Updated: WSA-Enlil Heliospheric Model to Include Cessation of WSA Results Generated at 5Rs, Relocation of Time Series Acquisition Point from Earth to L1 and Improved WSA Results: Effective April 4, 2023
• Jan 27: SCN22-94 Updated: Changes to the Geographic and Spectral Coverage of GOES-East/West Imagery on the Satellite Broadcast Network: Effective December 1, 2022 (GOES-East) and January 4, 2023 (GOES-West)
• Mar 10: SCN22-77 Updated: Change to NOAAPort/Satellite Broadcast Network (SBN): Effective in Early 2023
• Jan 20: SCN23-06: Disestablishment of C-MAN Station PLSF1 - Pulaski Shoals Light, FL: Effective February 28, 2023
• Jan 20: SCN23-05: Disestablishment of C-MAN Station MLRF1 - Molasses Reef, FL: Effective February 28, 2023
• Jan 20: SCN23-04: Disestablishment of C-MAN Station DPIA1 - Dauphin Island, AL: Effective February 28, 2023
• Jan 10: SCN23-03: Adoption of New Upper Limit for Alert Duration of NOAA Weather Radio All Hazards Specific Area Message Encoding Alerts: Effective on or after February 16, 2023
• Jan 5: SCN23-02: Minor RTMA and URMA Upgrade to Flag Mesonet Winds and Wind Gust from the CWOP and AWS Providers, Fix a Reading Bug in the Observation Reject and Accept Lists, and Add Surface Pressure to the “RTMA Weather Status List” for the FAA: Effective on or about February 7, 2023
• Jan 5: SCN23-01: Shut Down Integrated Dissemination Program (IDP) GIS Web Services (IDP-GIS) Hosted and Running on IDP Infrastructure in College Park, MD and Boulder, CO: Effective June 29, 2023

Service Change Notices 2022   

• Dec 16: SCN22-131: Upgrade of National Blend of Models Guidance: Effective January 17, 2023
• Dec 15: SCN22-130: Changes to Coastal Marine Forecast Zones for WFO Fairbanks, AK: Effective March 8, 2023
• Dec 15: SCN22-129: Changes to Marine Forecast Zones for WFO Anchorage, AK: Effective March 8, 2023
• Dec 15: SCN22-128: Changes to Coastal and Offshore Marine Forecast Zones for WFO Juneau, AK: Effective March 8, 2023
• Dec 15: SCN22-123 Updated: Changes to Public, Fire and Marine Forecast Zones for Service Office Pago Pago, American Samoa: Effective March 8, 2023
• Dec 14: SCN22-127: Changes to Public Forecast Zones for WFO Pittsburgh, PA: Effective March 8, 2023
• Dec 14: SCN22-126: Changes to Public Forecast Zones for WFO New York, NY: Effective March 8, 2023
• Dec 14: SCN22-125: Changes to Public and Fire Forecast Zones for WFO Baltimore, MD/Washington, DC: Effective March 8, 2023
• Dec 14: SCN22-124: Changes to Public, Fire and Marine Forecast Zones for WFO Baltimore, MD/Washington, DC: Effective March 8, 2023
• Dec 15: SCN22-123 Updated: Changes to Public, Fire and Marine Forecast Zones for Service Office Pago Pago, American Samoa: Effective March 8, 2023
• Dec 14: SCN22-122: Changes to Public Weather Forecast Zones for NWS Weather Forecast Office New Orleans/Baton Rouge, LA: Effective March 8, 2023
• Dec 14: SCN22-121: Changes to Public and Fire Weather Zones for NWS Lake Charles, LA: Effective March 8, 2023
• Dec 14: SCN22-120: Changes to Public Weather Forecast Zones for WFO Pendleton, OR: Effective March 8, 2023
• Feb 15, 2023: SCN22-119 Updated: Changes to Public and Fire Weather Forecast Zones for WFO Los Angeles/Oxnard, CA: Effective March 8, 2023
• Dec 14: SCN22-118: Changes to Fire Forecast Zones for WFOs Buffalo, NY; Binghamton, NY; Albany, NY; New York/Upton, NY and Burlington, VT: Effective March 8, 2023
• Dec 14: SCN22-117: Changes to Fire Forecast Zones for WFO Gray and WFO Caribou, ME: Effective March 8, 2023
• Dec 14: SCN22-116: Changes to Marine Forecast Zones for Weather Forecast Office San Juan, PR: Effective March 8, 2023
• Dec 14: SCN22-115: Changes to Eastern Pacific Offshore Forecast Zones for the National Hurricane Center/Tropical Analysis and Forecast Branch, Miami, FL: Effective March 8, 2023
• Dec 14: SCN22-114: Changes to Marine Zones for Weather Forecast Office Lake Charles, LA: Effective March 8, 2023
• Dec 12: SCN22-108 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS, formerly ESTOFS) to Version 1.1.0: Effective January 10, 2023
• Dec 6: SCN22-113: Operational Transition of the GOES-18 Satellite to Become GOES-West on January 4, 2023
• Jan 27: SCN22-94 Updated: Changes to the Geographic and Spectral Coverage of GOES-East/West Imagery on the Satellite Broadcast Network: Effective December 1, 2022 (GOES-East) and January 4, 2023 (GOES-West)
• Jan 30, 2023: SCN22-112 Updated: Activation of GOES-R Geostationary Lightning Mapper Gridded Data Products on the Satellite Broadcast Network on or after March 6, 2023
• Nov 22: SCN22-111: Change to NEXRAD Level III Product Dissemination on or around February 21, 2023
• Nov 17: SCN22-110: The National Centers for Environmental Prediction (NCEP) Climate Prediction Center (CPC) Will Change the Depiction and Output Formats of the Monthly Teleconnection Products on or around February 15, 2023
• Nov 15: SCN22-109: National Expansion of Partial County Alerting via NOAA Weather Radio and the Emergency Alert System, with Dissemination Enhancements, for the First Set of Counties is Planned for 2023
• Dec 12: SCN22-108 Updated: Upgrade of the Surge and Tide Operational Forecast System (STOFS, formerly ESTOFS) to Version 1.1.0: Effective January 10, 2023
• Nov 4: SCN22-107: Implementation of TAF Service for Hamilton Airport (KHRF) in Montana: Effective December 21, 2022
• Nov 2: SCN22-104 Updated: Upgrade NCEP Global Forecast System to v16.3.0: Effective November 29, 2022
• Nov 1: SCN22-106: Upgrade to HYSPLIT v8.0 to Provide Volcanic Ash Ensemble Predictions, HREF and GEFS Coupling to HYSPLIT and Time of Arrival Graphics for Radiological Release: Effective December 6, 2022
• Oct 28: SCN22-105: NWS API Version 1.10.1 Upgrade on or around November 16, 2022
• Nov 2: SCN22-104 Updated: Upgrade NCEP Global Forecast System to v16.3.0: Effective November 29, 2022
• Oct 27: SCN22-103: NAM, RAP, RTMA, URMA, GFS, GDAS and CDAS obsproc.v1.1.0 Upgrade Due to the Addition of New Observation Types and the Removal of One Observation Type: Effective November 29, 2022
• Oct 19: SCN22-102: Transition of the Radiosonde Replacement System (RRS) in Chuuk, Federated States of Micronesia to the 403 MHz Manual Radiosonde Observation System (MROS) in November 2022
• Oct 14: SCN22-101: Deployment of an Update to the Planetary K Index (Kp) on or about November 14, 2022
• Oct 13: SCN22-100: WFO Honolulu, HI to Issue Winter Storm Warnings and High Wind Warnings in Place of Blizzard Warnings: Effective on or about October 15, 2022
• Oct 12: SCN22-99: Transitioning the Experimental Day 3-7 Temperature Anomaly Graphics to Operations: Effective November 21, 2022
• Nov 9: SCN20-80: Updated: Enhancements to the Winter Storm Severity Index, Effective November 9, 2023
• Oct 11: SCN22-98: Transition of the South Central Alaska Mountain Recreational Forecast (REC) to the Avalanche Weather Guidance Issued by Weather Forecast Office (WFO) Anchorage, AK: Effective November 9, 2022
• Oct 7: SCN22-97: The Avalanche Weather Guidance Product Will Transition to Operational Status: Effective November 9, 2022
• Oct 3: SCN22-96: Change in NWS Dissemination of Harmful Algal Bloom Information from NWS Beach Hazard Statement for Florida and Texas NWS Offices: Effective October 3, 2022
• Sep 30: SCN22-95: Terminal Aerodrome Forecast (TAF) Availability at Pago Pago, American Samoa International Airport (NSTU/PPG) on or about September 30, 2022
• Sep 30: SCN22-85 Updated: Correction to the Transfer of National Weather Service (NWS) Pago Pago, American Samoa (PPG) Surface Observational Responsibilities to the American Samoa Government (ASG) on or about September 30, 2022
• Jan 27: SCN22-94 Updated: Changes to the Geographic and Spectral Coverage of GOES-East/West Imagery on the Satellite Broadcast Network: Effective December 1, 2022 (GOES-East) and January 4, 2023 (GOES-West)
• Sep 29: SCN22-93: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Two Upper Air Sites in October 2022
• Sep 28:  SCN22-92: NWS is Operationally Implementing the National GIS Map Viewer (the “Viewer”) Web Application and Water Program Site: Effective on or about Wednesday, September 28, 2022 
• Sep 22: SCN22-91: NOS OFS Version Updates and Implementation of Upgraded Oceanographic Forecast Modeling Systems for Lakes Superior and Ontario: Effective October 25, 2022
• Sep 21: SCN22-38 Updated: Upgraded IDP GIS Application to Version 3.1.0 on September 14, 2022
• Sep 19: SCN22-90: Announcement of Upgrade of the Global Ensemble Forecast System (GEFS) Aerosols Member (GEFS-Aerosols): Effective October 19, 2022
• Sep 15: SCN22-63 Updated: Changes to Fire Weather Zones for NWS Weather Forecast Office Albuquerque, NM: Effective September 13, 2022
• Sep 13: SCN22-89: Update to High-Resolution Ensemble Forecast (HREF): Effective September 13, 2022
• Sep 12: SCN22-88: Correction to NWS Shapefile Attributes for the Commonwealth of the Northern Mariana Islands: Effective September 13, 2022
• Sep 9: SCN22-87: WSR-88D RDA/RPG Build 21.0 Beta Test Began on August 22, 2022
• Sep 9: SCN22-86: Updates to Meteorological Model Ensemble River Forecasts: Effective on or about October 10, 2022
• Sep 30: SCN22-85 Updated: Correction to the Transfer of National Weather Service (NWS) Pago Pago, American Samoa (PPG) Surface Observational Responsibilities to the American Samoa Government (ASG) on or about September 30, 2022
• Sep 2: SCN22-84: Operational Implementation of NWS Damage Assessment Toolkit on or after October 26, 2022
• Sep 2: SCN22-83: Operational Implementation of the Intense Rainfall and Flash Flood Reports Webpage: Effective on or about September 30, 2022
• Sep 2: SCN22-82: Implementation of the Short Range River Forecast Uncertainty Graphic on or about September 30, 2022
• Aug 24: SCN22-81: Implementation of Impact-Based Warning Tags for Snow Squall Warnings and Changes to Wireless Emergency Alerts for Snow Squall Warnings: Effective on or after November 7, 2022
• Aug 24: SCN22-80: Implementing a New URL Address for the Experimental National GIS Map Viewer (the “Viewer”) Web Application: Effective September 26, 2022
• Aug 23: SCN22-79: GOES-R Mesoscale Fire Hotspots Promoted to the GOES-East and GOES-West Channels of the Satellite Broadcast Network: Effective August 23, 2022
• Aug 22: SCN22-78: Termination of the Week-1 Portion of the Climate Prediction Center Global Tropics Hazards and Benefits Outlook: Effective September 13, 2022
• March 10, 2023: SCN22-77 Updated: Change to NOAAPort/Satellite Broadcast Network (SBN): Effective in Early 2023
• Aug 22: SCN22-76: Lightning Climatology Across the Contiguous United States (CONUS) Will Become Operational: Effective September 21, 2022
• Aug 19: SCN22-59 Updated: NWS Systems to Implement a New Petersburg, AK Borough Census Area and Change the Hoonah-Angoon and Prince of Wales-Hyder, AK Census Areas: Effective September 13, 2022
• Aug 19: SCN22-60 Updated: Changes to Public and Fire Weather Forecast Zones for WFO Juneau, AK: Effective September 13, 2022
• Aug 19: SCN22-57 Updated: Changes to Marine Forecast Zones for WFO Portland, OR: Effective September 13, 2022
• Aug 19: SCN22-61 Updated: Changes to Public Forecast Zones for WFO Great Falls, MT: Effective September 13, 2022
• Sep 15: SCN22-63 Updated: Changes to Fire Weather Zones for NWS Weather Forecast Office Albuquerque, NM: Effective September 13, 2022
• Aug 19: SCN22-62 Updated: Changes to Public and Fire Forecast Zones for WFO Northern Indiana: Effective September 13, 2022
• Aug 16: SCN22-75: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Five Upper Air Sites in September 2022
• Aug 16: SCN22-74: Discontinuation of the Experimental Two-Class Seasonal Forecast Products: Effective September 15, 2022
• Aug 19: SCN22-62 Updated: Changes to Public and Fire Forecast Zones for WFO Northern Indiana: Effective September 13, 2022
• Sep 15: SCN22-63 Updated: Changes to Fire Weather Zones for NWS Weather Forecast Office Albuquerque, NM: Effective September 13, 2022
• Aug 11: SCN21-91 Updated: Addition of Polygons to Non-Weather Emergency Messages (NWEMs) in World Meteorological Organization (WMO) Text Products on or about November 7, 2022
• Aug 5: SCN22-73: Temporary Suspension of the Arkadelphia, AR (KADF) Terminal Aerodrome Forecast (TAF): Effective Immediately, August 5, 2022 and Until Further Notice
• Aug 2: SCN22-72: Global Coverage of MetOp-B ASCAT Winds on the Satellite Broadcast Network: Beginning on or After September 7, 2022
• Aug 1: SCN22-71: Changes to Global RTOFS v2.3 to Account for Bug Fixes, Bias Corrections and Changes in Data Inputs for Operations: Effective August 2, 2022
• Jul 28: SCN22-70: Removal of High-frequency Global Data Assimilation System (GDAS) Plots from the Climate Prediction Center (CPC) Webpage on or about December 1, 2022
• Jul 21: SCN22-69: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Two Upper Air Sites in August 2022
• Jul 19: SCN22-68: Correction of the Specification of Elevation of the Great Lakes in the High Resolution Rapid Refresh (HRRR): Effective on or about July 19, 2022
• Jul 18: SCN22-67: Changes to Climate Products (CLI, CLM, CLS, CLA) and Record Event Reports (RER) in the NWS New Orleans/Baton Rouge, LA Area of Responsibility on or about October 1, 2022
• Jul 15: SCN22-65 Updated: Implementation of Terminal Aerodrome Forecast (TAF) Service for KCIU-Chippewa County, MI International Airport: Effective August 10, 2022
• Jul 14: SCN22-66: Discontinuation of the Experimental Winter Storm Severity Index (WSSI) Day 4 Extension on or about August 13, 2022
• Jul 15: SCN22-65 Updated: Implementation of Terminal Aerodrome Forecast (TAF) Service for KCIU-Chippewa County, MI International Airport: Effective August 10, 2022
• Jun 24: SCN22-64: Change to the Transmission Deadline of the Weather Prediction Center QPF: Effective on or about Monday, August 1, 2022
• Sep 15: SCN22-63 Updated: Changes to Fire Weather Zones for NWS Weather Forecast Office Albuquerque, NM: Effective September 13, 2022
• Aug 19: SCN22-62 Updated: Changes to Public and Fire Forecast Zones for WFO Northern Indiana: Effective September 13, 2022
• Aug 19: SCN22-61 Updated: Changes to Public Forecast Zones for WFO Great Falls, MT: Effective September 13, 2022
• Aug 19: SCN22-60 Updated: Changes to Public and Fire Weather Forecast Zones for WFO Juneau, AK: Effective September 13, 2022
• Aug 19: SCN22-59 Updated: NWS Systems to Implement a New Petersburg, AK Borough Census Area and Change the Hoonah-Angoon and Prince of Wales-Hyder, AK Census Areas: Effective September 13, 2022
• Jun 23: SCN22-58: Implementation of the Rangeland Fire Danger Forecast Issued by WFO Austin-San Antonio, TX: Effective June 28, 2022
• Aug 19: SCN22-57 Updated: Changes to Marine Forecast Zones for WFO Portland, OR: Effective September 13, 2022
• Jun 21: SCN22-56: New and Existing NWS On-premise GIS Web Services Offering Hosted on the AWS Cloud will be Operationally Supported: Effective on or about June 21, 2022
• Jun 21: SCN22-55: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Two Upper Air Sites in July 2022
• Jun 17: SCN20-27 Updated: Weather Forecast Offices (WFOs) in Binghamton, NY (BGM); Burlington, VT (BTV) and Albany, NY (ALY) will Add the Ability to Issue Tropical Cyclone Forecast Products: Effective June 17, 2022
• Jun 16: SCN22-54: Addition of New Parameter to Several RAP Output Grids: Effective July 19, 2022
• Jun 13: SCN22-53: Change to GOES-R Legacy Vertical Temperature and Moisture Profiles on the Satellite Broadcast Network on or about July 13, 2022
• Jun 8: SCN22-52: Enforce TLS 1.1 or Higher on NCEP Hosted Sites: Effective Date: August 22, 2022
• Jun 7: SCN22-51: Addition of Air Quality Alerts for Southern California: Effective July 12, 2022
• Jun 6: SCN22-50: Changes to the Alaska Weather Information Line Phone Number: Effective on or after August 5, 2022
• Jun 2: SCN22-37 Updated: Satellite Broadcast Network to Broadcast GOES-18 Imagery August 1 to September 6, 2022 and October 15 to November 11, 2022
• Jun 2: SCN22-49: Satellite Broadcast Network to Test GOES-18 Imagery on June 14, 2022
• May 27: SCN22-48: Upgrade NCEP Global Forecast System to v16.1.6 to Assimilate New Commercial GNSS-RO Data: Effective March 29, 2022
• May 25: SCN22-43 Updated: Wet Bulb Globe Temperature Grids in the National Digital Forecast Database Will Transition to Operational Status on June 1, 2022
• May 25: SCN22-47: Mitigating the Low Bias of National Blend of Models (NBM) Deterministic 6-hour Quantitative Precipitation Forecasts (QPF06) for the CONUS Domain: Effective July 19, 2022
• May 23: SCN22-46: Implementation of Climate Products (CF6, CLI, CLM, CLA) for Death Valley at Furnace Creek, CA on or about July 1, 2022
• May 13: SCN22-45: Transition of the Radiosonde Replacement System (RRS) and Transitional Radiosonde Observing System (TROS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Eight Upper Air Sites in June 2022 
• May 9: SCN22-40 Updated: Migration and Go-Live of NCEP Model Production Suite to New Version of WCOSS: Effective June 28, 2022, with Two Test Periods Scheduled June 1 and June 14, 2022
• May 9: SCN22-42 Updated: Replacement of HYSPLIT Forecast Smoke Products with RAP Smoke Forecast Products: Effective June 28, 2022, with Two Test Periods Scheduled for June 1 and June 14, 2022
• May 6: SCN22-39 Updated: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Five Upper Air Sites in May 2022
• Jun 17: SCN20-27 Updated: Weather Forecast Offices (WFOs) in Binghamton, NY (BGM); Burlington, VT (BTV) and Albany, NY (ALY) Will Add the Ability to Issue Tropical Cyclone Forecast Products: Effective Immediately, June 17, 2022
• May 3: SCN22-44: Implementation of Terminal Aerodrome Forecast (TAF) Service for Gulf Shores International Airport (IAP), Gulf Shores, AL (KJKA): Effective July 14, 2022
• May 25: SCN22-43 Updated: Wet Bulb Globe Temperature Grids in the National Digital Forecast Database Will Transition to Operational Status on June 1, 2022
• May 9: SCN22-42 Updated: Replacement of HYSPLIT Forecast Smoke Products with RAP Smoke Forecast Products: Effective June 28, 2022, with Two Test Periods Scheduled for June 1 and June 14, 2022
• Apr 29: SCN22-41: Notification of Addition to the Directory Structure for Models Hosted on NCEP Web Services: Effective May 5, 2022
• May 9: SCN22-40 Updated: Migration and Go-Live of NCEP Model Production Suite to New Version of WCOSS: Effective June 28, 2022 with Two Test Periods Scheduled June 1 and June 14, 2022
• May 6: SCN22-39 Updated: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Seven Upper Air Sites in May 2022
• Sep 21: SCN22-38 Updated: Upgraded IDP GIS Application to Version 3.1.0 on September 14, 2022
• Apr 13: SCN22-35 Updated: Multi-Day Outage of NOMADS Website for Planned Maintenance: Effective April 19, 2022
• Jun 2: SCN22-37 Updated: Satellite Broadcast Network to Broadcast GOES-18 Imagery August 1 to September 6, 2022 and October 15 to November 11, 2022
• Apr 12: SCN22-32 Updated: Availability of Standard Hydrometeorological Exchange Format (SHEF) Encoded NOAA/National Ocean Service (NOS) Visibility Data: Effective May 3, 2022
• Apr 11: SCN22-27 Updated: Upgrade IDP Multi-Radar, Multi-Sensor Application: Effective April 21, 2022 
• Apr 7: SCN22-36: Change to NEXRAD Product Dissemination via NOAAPort/SBN on or around May 10, 2022
• Apr 13: SCN22-35 Updated: Multi-Day Outage of NOMADS Website for Planned Maintenance: Effective April 19, 2022
• Mar 30: SCN22-34: Transitioning the National Gridded Snowfall Analysis to Operational Status on or about Friday, April 29, 2022
• Mar 30: SCN22-33: Removing NAVGEM Input from Some NBM Probabilistic Temperature Quantile Mapping Forecasts for the CONUS Domain: Effective April 12, 2022
• Apr 12: SCN22-32 Updated: Availability of Standard Hydrometeorological Exchange Format (SHEF) Encoded NOAA/National Ocean Service (NOS) Visibility Data: Effective May 3, 2022
• Mar 24: SCN22-31: Metadata Update in Blended Hydro Products Suite on the Satellite Broadcast Network on or about April 26, 2022
• Mar 16: SCN22-30: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Seven Upper Air Sites in April 2022
• Mar 10: SCN22-29: Change in Data Coverage for the Regional Geoelectric Model: Effective March 23, 2022
• Mar 8: SCN22-28: Updates to Marine Channel Forecast Data on TGFTP: Effective April 12, 2022
• Apr 11: SCN22-27 Updated: Upgrade IDP Multi-Radar, Multi-Sensor Application: Effective April 21, 2022 
• Mar 1: SCN22-26: Aviation Tropical Cyclone Advisory (TCA) to Provide Forecast Information at Synoptic Hours Beginning on or about May 15, 2022
• Feb 28: SCN22-25: Addition of Year-Round Fire Weather Planning Forecasts: Effective March 15, 2022 in Central and Western Wyoming
• Feb 23: SCN22-20 Updated: Operational Implementation of Graphical Forecasts for Aviation (GFA) for Alaska: Effective March 1, 2022
• Feb 8: SCN22-24: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Seven Upper Air Sites in March 2022
• Feb 7: SCN22-23: Modifying Application Programming Interface Response Headers on February 7, 2022
• Jan 31: SCN22-22: Terminating the Display of the Point Precipitation Values from Automated Flood Warning Systems (AFWS) on the NWS Webpage on or after April 5, 2022
• Jan 28: SCN22-21: Changes to Segment Header Block for Weather Forecast Office Honolulu, HI Non-Precipitation Weather Messages: Effective March 1, 2022
• Feb 23: SCN22-20 Updated: Operational Implementation of Graphical Forecasts for Aviation (GFA) for Alaska: Effective March 1, 2022
• Jan 24: SCN22-15 Updated: Changes to Atlantic Offshore Forecast Zones for the Tropical Analysis and Forecast Branch of the National Hurricane Center: Effective March 22, 2022
• Jan 19: SCN22-19: Termination of the Legacy Wang Sheeley Arge Website at the Space Weather Prediction Center: Effective February 18, 2022
• Jan 11: SCN22-18: Updating Excessive Rainfall Outlook Probability Definitions on or about Thursday, February 10, 2022
• Jan 6: SCN22-17: Consolidation of Aeronautical Fixed Telecommunications Network (AFTN) Addresses Assigned to the National Weather Service Telecommunications Gateway on February 22, 2022
• Jan 6: SCN22-16: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Seven Upper Air Sites in February 2022
• Jan 6: SCN21-97 Updated: Depiction of the Climate Prediction Center (CPC) Week 3-4 Temperature and Precipitation Outlook Maps will Change on or about January 14, 2022
• Jan 24: SCN22-15 Updated: Changes to Atlantic Offshore Forecast Zones for the Tropical Analysis and Forecast Branch of the National Hurricane Center: Effective March 22, 2022
• Jan 6: SCN22-14: Reconfiguration of Fire Weather Zones by WFO Spokane, WA and WFO Pendleton, OR: Effective March 22, 2022
• Jan 6: SCN22-13: Reconfiguration of Public and Fire Weather Forecast Zones by WFO San Francisco Bay Area, CA: Effective March 22, 2022
• Jan 6: SCN22-12: Changes in Fire and Public Forecast Zones for NWS Weather Forecast Office Melbourne, FL for Volusia, Brevard, Indian River, Saint Lucie and Martin Counties in Florida: Effective March 22, 2022
• Jan 6: SCN22-11: Changes to Public and Fire Forecast Zones for NWS Weather Forecast Office Little Rock, AR: Effective March 22, 2022
• Jan 6: SCN22-10: Changes to Public and Fire Weather Forecast Zones for Weather Forecast Office Los Angeles/Oxnard, CA: Effective March 22, 2022
• Jan 6: SCN22-09: Changes to Public and Fire Weather Zones for NWS Weather Forecast Office New Orleans/Baton Rouge, LA: Effective March 22, 2022
• Jan 6: SCN22-08: Changes to Fire Forecast Zones for WFO Gray, ME: Effective March 22, 2022
• Jan 6: SCN22-07: Changes to Public and Marine Forecast Zones for WFO Tiyan, Guam: Effective March 23, 2022
• Jan 6: SCN22-06: Changes to Public and Fire Forecast Zones for Weather Forecast Office Greenville-Spartanburg, SC: Effective March 22, 2022
• Jan 6: SCN22-05: Changes to the Boundaries of Fire Weather Forecast Zones in Southeast Wyoming Served by NWS Weather Forecast Office (WFO) Cheyenne, Wyoming (CYS) and West Nebraska (NE) Panhandle: Effective March 22, 2022
• Jan 6: SCN22-04: Changes to Marine Zones for NWS Weather Forecast Office Corpus Christi, TX: Effective March 22, 2022
• Jan 6: SCN22-03: Changes to Public Forecast Zones for NWS Burlington, VT: Effective March 22, 2022
• Jan 6: SCN22-02: Implementing Improved Public and Fire Weather Forecast Zone Coverage for WFO Brownsville/Rio Grande Valley, TX: Effective March 22, 2022
• Jan 6: SCN22-01: Changes to Fire Forecast Zones for WFO Burlington, VT and WFO Albany, NY: Effective March 22, 2022

Service Change Notices 2021

• Dec 29: SCN21-105: Transfer of Terminal Aerodrome Forecast (TAF) Responsibility for Robert L. Bradshaw International Airport (TKPK), Saint Kitts and Nevis, to the Meteorological Watch Office (MWO) of Antigua and Barbuda: Effective 1700 UTC March 15, 2022
• Dec 22: SCN21-104: Deletion of Valdez-Cordova, AK Census Area and Federal Information Processing Standards (FIPS) Code and Addition of Chugach, AK Census Area and Copper River, AK Census Area with New FIPS Codes: Effective March 22, 2022 for NWS Products, Services and Systems
• Dec 22: SCN21-103: Changes to Marine Zones for WFOs Anchorage and Fairbanks, AK: Effective March 22, 2022
• Dec 22: SCN21-102: Changes in NWS Public Zones, Fire Weather Zones and County Warning Area and Hydrologic Service Area Boundaries:  Effective March 22, 2022
• Aug 11, 2022: SCN21-91 Updated: Addition of Polygons to Non-Weather Emergency Messages (NWEMs) in World Meteorological Organization (WMO) Text Products on or about November 7, 2022
• Dec 10: SCN21-101: Transfer of Terminal Aerodrome Forecast (TAF) Responsibility for Princess Juliana International Airport (TNCM), Sint Maarten to the Meteorological Watch Office (MWO) of Sint Maarten: Effective 1800 UTC February 28, 2022
• Dec 7: SCN21-100: Updates to Multisensor Snow and Ice Mapping System (IMS) Products on or around January 3, 2022
• Dec 3: SCN21-99: Mobile Bay Marine Channels Forecast Implementation: Effective December 6, 2021
• Dec 2: SCN21-98: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Nine Upper Air Sites in January 2022 
• Jan 6, 2022: SCN21-97 Updated: Depiction of the Climate Prediction Center (CPC) Week 3-4 Temperature and Precipitation Outlook Maps will Change on or about January 14, 2022
• Nov 23: SCN21-82 Updated: Deployment of NWSChat Application to the Integrated Dissemination Program: Effective December 7, 2021
• Nov 19: SCN21-33 Updated: Replacement of Common Alerting Protocol Parameter PIL with AWIPSidentifier and WMOidentifier Parameters: Effective on or about December 7, 2021
• Nov 19: SCN21-96: Change to NEXRAD Product Dissemination via NOAAPort/SBN on or around February 2, 2022
• Nov 18: SCN21-95: Depiction and Output Formats of the Daily Antarctic Oscillation (AAO), Arctic Oscillation (AO), North Atlantic Oscillation 
  (NAO) and Pacific North America (PNA) Teleconnection Products will Change on or about February 15, 2022
• Nov 18: SCN21-94: Tropical Weather Discussion (TWD) to Replace Discontinued NWS Guam Weather Forecast Office (WFO) Satellite Interpretation Message (SIM): Effective March 1, 2022 
• Nov 17: SCN21-86 Updated: Unit Change for the Rapid Refresh (RAP) and High Resolution Rapid Refresh (HRRR) Smoke Mass Density Output and Change to Identification of the Height of the Level of Free Convection Parameter: Effective December 21, 2021
• Nov 8: SCN21-93: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Five Upper Air Sites in December 2021
• Nov 5: SCN21-33 Updated: Replacement of Common Alerting Protocol Parameter PIL with AWIPSidentifier and WMOidentifier Parameters: Effective on or about December 7, 2021 
• Nov 3: SCN21-92: Implementation of Aviation Weather Warning (AWW) Service for Ted Stevens Anchorage International Airport, AK (PANC): Effective January 18, 2022 
• Aug 11, 2022: SCN21-91 Updated: Addition of Polygons to Non-Weather Emergency Messages (NWEMs) in World Meteorological Organization (WMO) Text Products on or about November 7, 2022
• Oct 15: SCN21-90: Transition of the Radiosonde Replacement System (RRS) to the 403 MHz Manual Radiosonde Observation System (MROS) at Five Upper Air Sites in November 2021
• Oct 13: SCN21-86 Updated: Unit Change for the Rapid Refresh (RAP) and High Resolution Rapid Refresh (HRRR) Smoke Mass Density Output and Change to Identification of the Height of the Level of Free Convection Parameter: Effective December 21, 2021
• Nov 23: SCN21-82 Updated: Deployment of NWSChat Application to the Integrated Dissemination Program: Effective December 7, 2021
• Oct 7: SCN21-89: Transition of the Transitional Radiosonde Observing System (TROS) to Manual Radiosonde Observation System (MROS) at Blacksburg, VA, on or about October 25, 2021
• Oct 7: SCN21-88: Transition of the Radiosonde Replacement System (RRS) to Manual Radiosonde Observation System (MROS) at Amarillo, TX, on or about October 25, 2021
• Oct 7: SCN21-87: Transition of the Radiosonde Replacement System (RRS) to Manual Radiosonde Observation System (MROS) at Brownsville, TX, on or about October 18, 2021
• Oct 4: SCN21-56 Updated: Implementation of the Consolidation and/or Reformatting of Flood Watches, Warnings and Advisories on or after November 4, 2021
• Oct 13: SCN21-86 Updated: Unit Change for the Rapid Refresh (RAP) and High Resolution Rapid Refresh (HRRR) Smoke Mass Density Output and Change to Identification of the Height of the Level of Free Convection Parameter: Effective December 21, 2021
• Sep 28: SCN21-85: Transition to Operational Status of Offshore and High Seas Gridded Forecasts from the NHC TAFB and WFO Honolulu, HI and the Offshore Gridded Forecasts from the OPC in the Pacific Basin: Effective October 28, 2021
• Sep 28: SCN21-33 Updated: Replacement of Common Alerting Protocol Parameter PIL with AWIPSidentifier and WMOidentifier Parameters: Effective on or About December 7, 2021
• Sep 23: SCN21-84: Marine Forecast Matrix Issued by Weather Forecast Office Honolulu for Additional Pacific Locations Beginning October 1, 2021
• Sep 17: SCN21-83: Addition of GOES-West Fog and Low Stratus Data Product for the West CONUS / PACUS Sector to the Satellite Broadcast Network (SBN) on or after October 18, 2021
• Oct 12: SCN21-82 Updated: Deployment of NWSChat Application to the Integrated Dissemination Program: Effective December 7, 2021
• Sep 3: SCN21-81: Probabilistic Extra-Tropical Storm Surge (P-ETSS) Model and Extra-Tropical Storm Surge (ETSS) Model Updates to Correct the Timing of Station Tides at Hooper Bay, AK and Protection Point, AK: Effective September 7, 2021
• Sep 3: SCN21-80: Update to High-Resolution Window (HIRESW): Effective September 8, 2021
• Nov 9: SCN20-80: Updated: Enhancements to the Winter Storm Severity Index, Effective November 9, 2023
• Aug 30: SCN21-79: GOES-West ABI Level-2 Products to be Added to the Satellite Broadcast Network on or after September 30, 2021
• Aug 27: SCN21-26 Updated: Operational ICAO Meteorological Information Exchange Model (IWXXM) Products for Aviation are Delayed until on or around September 29, 2021 
• August 24: SCN21-78: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Detroit/White Lake, MI, on or about September 14, 2021
• Aug 23: SCN21-77: Implementation of the National Weather Service (NWS) Enhanced Extreme Precipitation Monitor (EPM) on or about September 22, 2021
• Aug 19: SCN21-76: GEFSv12 Tropical Cyclone Track and Genesis Data Timing Changes: Effective August 24, 2021 
• Aug 11: SCN21-75: Discontinuation of Local 3-Month Temperature Outlook on August 26, 2021
• Aug 10: SCN21-74 Updated: GOES-East and GOES-West Fire Hotspots for Mesoscale Sectors to be Added to the Satellite Broadcast Network (SBN) on or after September 8, 2021
• Aug 5: SCN21-73: Update to the National Blend of Models (NBM) Quantile Mapping and Dressing (QMD) to Fix an Issue with Probability of Precipitation Values in the Alaska Domain: Effective on or about August 17, 2021
• Aug 4: SCN21-55 Updated: Changes to Fire Weather Zones for Weather Forecast Office Honolulu, HI: Effective July 26, 2021
• Aug 4: SCN21-72: RTMA, RAP, NAM, GFS and GDAS Sfcshp and Prepbufr Output File Content Change Due to Addition of BUFR Format Ships and C-MAN Data: Effective August 10, 2021 
• Aug 3: SCN21-71 Updated: The Depiction of the Climate Prediction Center 6-10 Day, 8-14 Day, Monthly and Seasonal Outlook Temperature and Precipitation Static Maps will Change on or near September 15, 2021
• Jul 26: SCN21-70: Probabilistic Extra-Tropical Storm Surge (P-ETSS) Model and Extra-Tropical Storm Surge (ETSS) Model Updates for Initial Water Level for Palm Beach, FL: Effective July 27, 2021
• Jul 21: SCN21-23 Updated: Modification of Common Alerting Protocol Parameters for Severe Thunderstorm Warnings on or around July 28, 2021
• Jul 20: SCN21-69: Change to Pacific Tsunami Warning Center City Location in the Mass News Disseminator (MND) Header Block Beginning September 1, 2021
• Jul 19: SCN21-68: Discontinuation of Climate Product for Corona Municipal Airport (KAJO), CA on or about August 30, 2021
• Jul 15: SCN21-60 Updated: Air Quality Prediction v6 (AQM) Update: Effective July 20, 2021
• Jul 8: SCN21-67: New Lake Erie Harmful Algal Bloom Webpage Map Interface: Effective July 7, 2021
• Jul 8: SCN21-65 Updated: Implementation of the Whole Atmosphere Model-Ionosphere Plasmasphere Electrodynamics (WAM-IPE) Forecast System (WFS), a New Space Weather Product from the Space Weather Prediction Center (SWPC): Effective July 14, 2021
• Jul 1: SCN21-58 Updated: Upgrade of the Global Extratropical Surge and Tide Operational Forecast System (Global ESTOFS) to Version 2.0.3: Effective July 27, 2021
• Jul 1: SCN21-66: Changes to the High Surf Advisory Thresholds for South and East-facing Shores of the Hawaiian Islands: Effective on or around August 2, 2021
• Jul 8: SCN21-65 Updated: Implementation of the Whole Atmosphere Model-Ionosphere Plasmasphere Electrodynamics (WAM-IPE) Forecast System (WFS), a New Space Weather Product from the Space Weather Prediction Center (SWPC): Effective July 14, 2021
• Jun 30: SCN21-64: Product Changes for CBOFS and NGOFS2 Station Output Files: Effective July 7, 2021
• Jun 24: SCN21-22 Updated: Enhanced Features of the Text-based NWS Severe Thunderstorm Warning and Special Weather Statement Products: Implemented Mid-to-Late July 2021
• Jun 24: SCN21-63: Reconfiguration of Public Forecast Zones by WFO Spokane, WA: Effective September 8, 2021
• Jun 24: SCN21-62: Changes to Public Forecast Zones for Central California: Effective September 8, 2021
• Jun 21: SCN21-61: Announcement of Minor Upgrade to the Global Ensemble Forecast System (GEFS): Effective July 20, 2021
• Jul 15: SCN21-60 Updated: Air Quality Prediction v6 (AQM) Update: Effective July 20, 2021
• Jun 21: SCN21-59 Updated: Updates to the NWS RFC QPE Services on IDP GIS: Effective on or after July 20th, 2021
• Jul 1: SCN21-58 Updated: Upgrade of the Global Extratropical Surge and Tide Operational Forecast System (Global ESTOFS) to Version 2.0.3: Effective July 27, 2021
• Jun 9: SCN21-57: Upcoming Changes to the Model Analysis and Guidance (MAG) Website: Effective July 13, 2021
• Oct 4: SCN21-56 Updated: Implementation of the Consolidation and/or Reformatting of Flood Watches, Warnings and Advisories on or after November 4, 2021
• Jun 8: SCN21-37 Updated: WSR-88D RDA/RPG Build 20.0 Beta Test Began on May 25, 2021
• Aug 4: SCN21-55 Updated: Changes to Fire Weather Zones for Weather Forecast Office Honolulu, HI: Effective July 26, 2021
• May 28: SCN21-54: Updates to the Aeronautical Fixed Telecommunications Network (AFTN) on or about June 22, 2021
• May 25: SCN21-53: Discontinuing Legacy ProbSevere Product from IDP Multi-Radar, Multi-Sensor Application: Effective August 10, 2021
• May 17: SCN21-52: Upgrade NCEP Global Forecast System to v16.1.1: Effective May 18, 2021
• Jun 8: SCN21-37 Updated: WSR-88D RDA/RPG Build 20.0 Beta Test Scheduled to Begin on or around May 25, 2021
• May 7: SCN21-51: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Lihue, HI, on or about June 1, 2021
• May 7: SCN21-50: Initial Implementation of SPC-Post, Including Calibrated Thunderstorm and Severe Thunderstorm Guidance: Effective May 11, 2021
• May 5: SCN21-49: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Hilo, HI, on or about May 24, 2021
• Aug 27: SCN21-26 Updated: Operational ICAO Meteorological Information Exchange Model (IWXXM) Products for Aviation are Delayed until on or around September 29, 2021
• May 3: SCN21-27A: Update to the National Blend of Models (NBM) Quantile Mapping and Dressing (QMD) to Fix an Issue with Unrealistically High Probability of Precipitation Values over Northwest Mexico
• Apr 26: SCN21-48: Discontinue GEFS Legacy Version 10 Output: Effective May 26, 2021
• Apr 23: SCN21-47 Updated: eXtensible Markup Language (XML) Graphical AIRman's METeorological Information (G-AIRMET) is Now Operational
• Apr 22: SCN21-46: WFO Honolulu, HI to Issue Coastal Flood Statements: Effective May 21, 2021
• Apr 16: SCN21-45: Termination of the Marine Weather Discussion Text Product: Effective May 17, 2021      
• Apr 16: SCN21-44 Updated: Implementation of Terminal Aerodrome Forecast (TAF) Service for Northeast Kingdom International Airport, Newport, VT (KEFK): Effective May 18, 2021
• Apr 15: SCN21-43: Implementation of Terminal Aerodrome Forecast (TAF) Service for Jefferson City Memorial Airport, Jefferson City, MO (KJEF): Effective May 18, 2021
• Apr 16: SCN21-42 Updated: Implementation of Terminal Aerodrome Forecast (TAF) Service for Charleston Executive Airport, Charleston, SC (KJZI): Effective May 19, 2021
• Apr 9: SCN21-41: Probabilistic Tropical Cyclone Storm Surge (P-Surge) Model Upgrade: Effective May 11, 2021
• Apr 9: SCN21-40: Addition of the Extreme Wind Warning to the Suite of Tropical Products Issued by WFO Honolulu, HI: Effective on or around June 1, 2021
• Apr 2: SCN21-39: Metadata Correction to 1-Hourly Climatology Calibrated Precipitation Analysis (CCPA) Product: Effective May 4, 2021
• Apr 23: SCN21-38 Updated: Upgrade to High Resolution Ensemble Forecast (HREF) and High-Resolution Window (HIRESW): Effective May 11, 2021
• Jun 8: SCN21-37 Updated: WSR-88D RDA/RPG Build 20.0 Beta Test Began on May 25, 2021
• Apr 1: SCN21-03 Updated: Changes to Public Forecast Zones for Weather Forecast Office Honolulu, HI: Effective March 30, 2021
• Mar 31: SCN21-36: Turn Off Date for WSR-88D Low-Resolution Products on or around May 2, 2021
• Mar 30: SCN21-35: Discontinuing the OPC Marine Weather Discussion (MIM): Effective 2200 UTC April 29, 2021
• Mar 26: SCN21-34: Notice of Radar Level II Outage Downstream Impacts: Effective March 27, 2021
• Sep 28: SCN21-33 Updated: Replacement of Common Alerting Protocol Parameter PIL with AWIPSidentifier and WMOidentifier Parameters: Effective on or about December 7, 2021
• Mar 17: SCN21-32: NOMADS/FTP Website User Access Changes: Effective April 20, 2021
• Mar 17: SCN21-31: Addition of Air Quality Alerts for Smoke for North Central and Southwest Wyoming: Effective May 4, 2021
• Mar 17: SCN21-30: NWS Upper Air Station at Chatham, MA to Permanently Close: Effective April 1, 2021
• Mar 18: SCN21-20 Updated: Upgrade NCEP Global Forecast Systems (GFS) to v16: Effective March 17, 2021
• Mar 15: SCN21-29: Implementation of Partial County Alerting via NOAA Weather Radio All Hazards (NWR) and the Emergency Alert System (EAS) for Clark County, NV: Effective on or about June 1, 2021
• Mar 12: SCN21-28: NAM, GFS and GDAS Satellite Output Filename Change Due to Addition of Commercial Satellite Data: Effective April 13, 2021
• Mar 3: SCN21-27: Additive Field Change to the Aviation Tropical Cyclone Advisory (TCA): Effective on or about May 15, 2021
• Aug 27: SCN21-26 Updated: Operational ICAO Meteorological Information Exchange Model (IWXXM) Products for Aviation are Delayed until on or around September 29, 2021
• Feb 23: SCN21-25: Removal of Amber Alerts (SAME Code: Child Abduction Emergency) from the National Hazards Map: Effective March 24, 2020
• Mar 19: SCN21-24 Updated: Modifying the NBM's Quantile Mapping and Dressing (QMD) Grand Ensemble Mean (GEM) Deterministic QPF for the CONUS, Alaska and Puerto Rico Domains; and Minor Corrections Made to the NBM QMD QPF, Present Weather, Alaska Fire Weather and Text Message Products: Effective March 29, 2021
• Jul 21: SCN21-23 Updated: Modification of Common Alerting Protocol Parameters for Severe Thunderstorm Warnings on or around July 28, 2021
• Jun 24: SCN21-22 Updated: Enhanced Features of the Text-based NWS Severe Thunderstorm Warning and Special Weather Statement Products: Implemented Mid-to-Late July 2021
• Mar 19: SCN20-99 Updated: Changes to LAMP Station-based and Gridded Guidance: Effective March 22, 2021
• Mar 19: SCN20-119: Upgrade of National Water Model on NCEP’s WCOSS System and its Post-Processing Application on the Integrated Dissemination Platform (IDP): Effective April 20, 2021
• Mar 18: SCN21-21 Updated: Notification of Dissemination Changes of Models Downstream of the GFS Due to the GFSv16 Upgrade: Effective March 22, 2021
• Mar 18: SCN21-20 Updated: Upgrade NCEP Global Forecast Systems (GFS) to v16: Effective March 22, 2021
• Mar 17: SCN21-14 Updated: Implementation of New Oceanographic Forecast Modeling System for the U.S. West Coast (WCOFS) and the Upgraded Northern Gulf of Mexico (NGOFS2): Effective Monday, March 22, 2021
• Feb 25: SCN20-108 Updated: The Special Avalanche Bulletin (SAB) Will Become Authorized for Use at Additional Weather Forecast Offices (WFOs): Effective December 16, 2020
• Feb 24: SCN20-117 Updated: Static Radar Image Files Temporarily Suspended on EMWIN Services: Effective December 16, 2020
• Feb 19: SCN20-111 Updated: IP Address Changes to NWSChat and NOAA Weather Wire Service Open Interface on or about March 2, 2021
• Feb 16: SCN21-01 Updated: Implementation of IDP CAP Handler Application and Modification of CAP Version 1.2 Output: Effective February 24, 2021
• Feb 10: SCN21-19: Changes to the NWS RFC QPE Services on IDP GIS: Effective on or after March 23, 2021
• Feb 10: SCN21-18: NCWCP Electrical Preventative Maintenance February 13 and February 20, 2021
• Feb 3: SCN21-05 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, for Clay, Duval and Putnam Counties in Florida: Effective March 30, 2021
• Feb 1: SCN20-116 Updated: The Nearshore Wave Prediction System (NWPS) Update v1.3: Effective on or about February 3, 2021
• Feb 1: SCN20-100 Updated: Geospace Model (SWMF) Upgraded to Version 2.0: Effective February 3, 2021
• Jan 27: SCN21-17: Upgrade of Multi-Radar Multi-Sensor (MRMS) System to v12.1.0: Effective February 23, 2021
• Jan 26: SCN21-16: Implementation of a Format Change to the Rangeland Fire Danger Forecast issued by WFO Corpus Christi, TX: Effective February 24, 2021
• Jan 20: SCN21-15: Discontinuation of the Max/Min Temperature and Precipitation Table Product for Tennessee on February 19, 2021
• Mar 17: SCN21-14 Updated: Implementation of New Oceanographic Forecast Modeling System for the U.S. West Coast (WCOFS) and the Upgraded Northern Gulf of Mexico (NGOFS2): Effective Monday, March 22, 2021
• Jan 19: SCN21-13: Changes to Hydrologic Ensemble Forecast Service (HEFS) Probabilistic Water Resources Forecasts Issued by NWS RFCs: Beginning on February 18, 2021 and Fully Implemented by September 30, 2021
• Jan 15: SCN20-118 Updated: Outage of NOMADS Website for Planned Maintenance: Effective January 21, 2021
• Jan 14: SCN21-12: Changes to Marine Zones for WFO New York, NY (OKX): Effective March 30, 2021
• Jan 14: SCN21-11: Changes to Marine Zones for WFO Duluth, MN (DLH) and WFO Marquette, MI (MQT): Effective March 30, 2021
• Jan 14: SCN21-10: Hydrologic Service Changes for Green River and Colorado River in Utah Provided by NWS WFOs Grand Junction, CO and Salt Lake City, UT: Effective March 30, 2021
• Jan 13: SCN21-09: Changes to Public Forecast Zones for WFO Salt Lake City, UT: Effective March 30, 2021
• Jan 13: SCN21-08: Changes to Fire Weather Forecast Zones for WFO Reno, NV: Effective March 30, 2021
• Jan 13: SCN21-07: Changes to Fire Weather Forecast Zones for NWS Weather Forecast Office Miami, FL: Effective March 30, 2021
• Jan 13: SCN21-06: Changes to Public and Fire Weather Zones for NWS Weather Forecast Office New Orleans/Baton Rouge, LA: Effective March 30, 2021
• Feb 3: SCN21-05 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, for Clay, Duval and Putnam Counties in Florida: Effective March 30, 2021
• Jan 13: SCN21-04: Changes to Public and Fire Forecast Zones for NWS Weather Forecast Office Houston/Galveston, TX: Effective March 30, 2021
• Apr 1: SCN21-03 Updated: Changes to Public Forecast Zones for Weather Forecast Office Honolulu, HI: Effective March 30, 2021
• Jan 13: SCN21-02 Updated: Changes to Public and Fire Forecast Zones for WFO Columbia, SC: Effective March 30, 2021
• Feb 16: SCN21-01 Updated: Implementation of IDP CAP Handler Application and Modification of CAP Version 1.2 Output: Effective February 24, 2021

For older PNSs, SCNs and TINs, see our archive: https://www.weather.gov/notification/archive