A Pacific trough dug into the Great Basin as the upper level jet rounding its base advected abundant moisture into the Four Corners Region. This resulted in moderate to heavy snow across most of the mountain ranges across western Colorado as well as some valleys.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GJT wrote it up.
A Pacific trough dug into the Great Basin as the upper level jet rounding its base advected abundant moisture into the Four Corners Region. This resulted in moderate to heavy snow across most of the mountain ranges across western Colorado as well as some valleys.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before the first event at Feb 28, 6:16 PM MST, 3 hours 14 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Grand Junction CO 334 AM MST Tue Feb 28 2023 COZ001>014-017>023-UTZ022>025-027>029-011045- Lower Yampa River Basin-Central Yampa River Basin- Roan and Tavaputs Plateaus-Elkhead and Park Mountains- Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor- Central Colorado River Basin-Grand and Battlement Mesas- Gore and Elk Mountains/Central Mountain Valleys- Central Gunnison and Uncompahgre River Basin- West Elk and Sawatch Mountains-Flat Tops- Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide- Northwest San Juan Mountains-Southwest San Juan Mountains- Paradox Valley/Lower Dolores River- Four Corners/Upper Dolores River-Animas River Basin- San Juan River Basin-Southeast Utah-Eastern Uinta Mountains- Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat- La Sal and Abajo Mountains-Canyonlands/Natural Bridges- 334 AM MST Tue Feb 28 2023 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Snow and blowing snow will be a threat over much of the high country over the next 24 hours. Snow will also be developing in the lower elevations with the most significant accumulations expected over the 4 Corners region. Winds gusting over 55 mph can be expected over many mountain ridges. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Another storm moving out of the West will arrive by Wednesday and keep a threat of heavy snow in southern portions of Utah and Colorado through Thursday. Some lightning is possible Wednesday afternoon with this storm as well. After a short break on Saturday...snow returns to the forecast for the northern and central Colorado mountains by Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight, however spotters are encouraged to report snowfall amounts to the National Weather Service in Grand Junction.
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</html>PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
641 PM MST TUE FEB 28 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM SNOW HAYDEN 40.49N 107.25W
02/28/2023 M1.5 INCH ROUTT CO CO-OP OBSERVER
&&The national radar mosaic for the moment the first event began.
5 heavy snow, 1 winter weather. Local standard time, as filed.
Generally 2 to 5 inches of snow fell across the area.
Generally 1 to 2 feet of snow fell across the area.
Generally 8 to 13 inches of snow fell across the area with locally higher amounts of up to 23 inches estimated at the Park Reservoir SNOTEL site.
Generally 5 to 10 inches of snow fell across the area.
Generally 10 to 20 inches of snow fell across the area.
Generally 3 to 6 inches of snow fell across the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2023Every state in 2023This day in weather historyWarnings in Colorado, February 2023
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1075031, 1075026, 1075036, 1075038, 1075028, 1075033.