Tropical Cyclone Web Page Update - WFO Guam

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NOPQ40 PGUM 100503
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GUZ001-MPZ001>003-111000-

Public Information Statement
National Weather Service Tiyan GU
303 PM ChST Thu Apr 10 2025

...WFO GUAM TO UPDATE ITS TROPICAL CYCLONES WEB PAGE AROUND 3 JUNE
2025...

Effective on or around June 3rd, WFO Guam will modify its tropical
cyclones (TC) web page, https://www.weather.gov/gum/Cyclones to
feature the probabilistic TC graphics produced by the Central Pacific
Hurricane Center (CPHC) in Honolulu, Hawaii. These graphics are based
on the TC forecasts from the Joint Typhoon Warning Center (JTWC), in
Pearl Harbor, Hawaii. Additionally, deterministic forecast tracks
indicating TC wind radii will no longer be posted by WFO Guam.

The CPHC-produced graphics were first introduced to the western North
Pacific (WNP) in 2022, as experimental graphics, before becoming
operational in 2023. Three types of forecast graphics will be posted
for each active TC in the WNP: 3- and 5-day track and error cones,
wind speed probabilities for 34- 50- and 64-kt winds, and arrival
times of tropical storm (TS) winds. These graphics better convey the
uncertainty in TC motion and TC wind arrival time.

For more information, see the Service Change Notices issued on 23 Feb
2023 for...

Track and error cone graphics:
https://www.weather.gov/media/notification/pdf_2023_24/scn23-26_tc_track_error_cone_graphics_jtwc.pdf

Wind speed probability graphics:
https://www.weather.gov/media/notification/pdf_2023_24/scn23-29_tc_surface_wind_speed_probabilities_graphics_t2o.pdf

Arrival of TS-force winds graphics:
https://www.weather.gov/media/notification/pdf_2023_24/scn23-30_w_pac_s_pac_toa_graphics_t2o.pdf

All other TC-related text products, including the TC Public
Advisories, Local Statements, and TC Updates, issued by WFO Guam will
continue to be produced and posted to the web page.

Note: These graphics will not have a backup production site in the
event conditions exist that prevent the product from being issued
from the original production source at JTWC or CPHC. The
deterministic forecast track graphics created by JTWC can still be
found at:
https://www.metoc.navy.mil/jtwc/jtwc.html

For any question , please reach out to the WFO Guam Science and
Operations Officer, William Brandon Aydlett at
william.aydlett@noaa.gov

$$

W. Aydlett