High pressure building into Western Colorado behind a cold front allowed skies to clear and brought unusually cold temperatures to the lower river valley elevations.
Every event with a place to put it; 3 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.
High pressure building into Western Colorado behind a cold front allowed skies to clear and brought unusually cold temperatures to the lower river valley elevations.
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 Apr 29, 8:35 PM MST, 55 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 frost/freeze. Local standard time, as filed.
Minimum temperatures fell to between 24 and 30 degrees over a large portion of the area.
Minimum temperatures fell to between 24 and 30 degrees over a large portion of the area.
Minimum temperatures fell to between 25 and 31 degrees over a large portion of the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2011Every state in 2011This day in weather historyWarnings in Utah, April 2011
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: 330559, 330557, 330558.