Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

A Pacific storm and atmospheric river will impact the Pacific Northwest states and northern Rockies this weekend, bringing locally heavy low elevations rain and heavy high elevation snow in the mountains. By Sunday over the Interior Northwest, rain combined with snowmelt will increase the risk of flood hazards. Flood Watches are in effect. Read More >

Overview

A powerful low pressure system affected much of the southwestern United States from February 20th through the 23rd. This storm was characterized by cold temperatures and very high snowfall totals across the Four Corners region. Over three feet of snow fell in the San Juan Mountains, with well over a foot along portions of the US 160 corridor.

This storm was the largest in a series of heavy snow events across the central and southern Rockies throughout the month of February. Mountain snowpack values averaged well above seasonal averages, and were close to 150% of normal by the time the storm ended.

Many highways in southeast Utah and southwest Colorado were closed for a period of time on February 22nd when snow rates were at their highest. Mountain passes in the San Juans were closed due to avalanche concerns. Avalanche warnings were issued in the La Sal, Abajo and San Juan mountains.

A large area of low pressure dives southward through the western United States on February 22nd. This system was accompanied by very cold air stretching all the way south of the USA/Mexico Border and into the eastern Pacific Ocean.


Snowfall at Purgatory Ski Resort on 2/22. Photo credit: Purgatory Ski Resort	Snowfall at Powderhorn Ski Resort. Photo credit: Powderhorn Ski Resort	Snowfall in the San Juan Mountains. Photo credit: Purgatory Ski Resort

Photos & Video
Radar

Photos & Video


Snow in Pagosa Springs on February 22nd. Photo courtesy of Michele Ó Raifeartaigh	Snow in Pagosa Springs on February 22nd. Photo courtesy of Jay Godson	Snow in the Durango West Subdivision. Photo from Jerry McBride/Durango Herald	Snow on top of the Kennebec Cafe in Hesperus. Photo from Jerry McBride/Durango Herald

Radar and Satellite Imagery


KGJX radar data throughout the heaviest portion of snowfall on February 22nd. Data visualization courtesy of College of DuPage.	GOES West Infrared data showing the evolution of the low pressure and moisture stream over the southwest USA. Data visualization courtesy of CIRA.	GOES West Water Vapor imagery showing the deep low pressure system moving across the southwest. Data visualization courtesy of CIRA.	Satellite derived snowfall data before and after the event. Data visualization courtesy of NOHRSC.

Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.

Follow us on X

Follow us on Facebook

Follow us on YouTube

GJT RSS Feed

Atmospheric River in the Pacific Northwest and Northern Rockies this Weekend

February 20-23 Winter Storm