A quick moving midlevel low pressure system lifted across southwest Colorado. This resulted in moderate snowfall for the Northwest San Juan Mountains, focused at elevations above 9500 feet.
Every event with a place to put it; 1 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 quick moving midlevel low pressure system lifted across southwest Colorado. This resulted in moderate snowfall for the Northwest San Juan Mountains, focused at elevations above 9500 feet.
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 May 10, 4:14 PM MST, 5 hours 46 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Grand Junction CO 338 AM MDT Wed May 10 2023 COZ001>014-017>023-UTZ022>025-027>029-111345- 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- 338 AM MDT Wed May 10 2023 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight A few showers and thunderstorms will be possible this afternoon and evening ahead of the next system. Accumulating snow is expected after midnight tonight with 6 to 10 inches possible above 10K feet. Winter weather advisories have been issued to account for the snow. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Unsettled weather will remain in the forecast as the system that brings the snow slowly lifts to the northeast. Once that passes, several pieces of energy will move through eastern Utah and western Colorado from time to time bringing periods of showers and thunderstorms. Water levels will continue to run high until further notice with above normal snowpack still in place in the high country. Warming temperatures have produced an uptick in snowmelt resulting in higher stream volumes across the area. Snowfall and rainshowers may exacerbate the flooding issues. Numerous flood products have been issued. .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>The national radar mosaic for the moment the first event began.
1 winter weather. Local standard time, as filed.
Generally 6 to 9 inches of snow fell at elevations above 9500 feet. A trained spotter reported a locally higher amount of 11 inches near Trout Lake.
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, May 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 2026-09-24. Each event’s entry at NCEI: 1086636.