Strong and persistent temperature inversions over snow-covered ground caused dense fog to form in low valley locations.
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.
Strong and persistent temperature inversions over snow-covered ground caused dense fog to form in low valley locations.
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 4, 3:05 PM MST, 6 hours 55 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 603 AM MST THU FEB 4 2010 COZ001>014-017>023-UTZ022>025-027>029-051402- ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES- CENTRAL COLORADO RIVER BASIN- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR- EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS- ELKHEAD AND PARK MOUNTAINS-FLAT TOPS- FOUR CORNERS/UPPER DOLORES RIVER- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS- GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN- NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER- ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH- SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU- UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY- UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS- 603 AM MST THU FEB 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT PATCHY FOG IS POSSIBLE IN SOME OF THE VALLEY AREAS THIS MORNING... ESPECIALLY IN THE UINTA BASIN IN NORTHEAST UTAH...AND ON THE GRAND FLAT IN EAST CENTRAL UTAH. VISIBILITY MAY FALL BELOW ONE MILE AT ISOLATED LOCATIONS. SNOW SHOWERS WILL DEVELOP OVER THE MOUNTAINS TODAY...WITH LIGHT ACCUMULATIONS MAINLY OVER THE NORTHERN MOUNTAINS. SNOW WILL TAPER OFF TO SCATTERED SHOWERS LATER TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH TUESDAY PRECIPITATION WILL START FRIDAY NIGHT OVER THE NORTHERN AND CENTRAL MOUNTAINS AS HIGH PRESSURE BREAKS DOWN. BY SATURDAY...NEXT DISTURBANCE WILL BRING PRECIPITATION OVER ENTIRE CWA...ESPECIALLY SAN JUANS AND HIGHER ELEVATIONS IN UTAH. THIS SYSTEM WILL MOVE OUT OF THE AREA BY SUNDAY AFTERNOON AS ANOTHER SYSTEM DROPS DOWN FROM THE NORTH CAUSING PRECIPITATION OVER CONTINENTAL DIVIDE THROUGH TUESDAY. SIGNIFICANT SNOW ACCUMULATION IS POSSIBLE THROUGH THE PERIOD FOR VARIOUS AREAS OF COLORADO AND UTAH. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
The national radar mosaic for the moment the first event began.
1 dense fog. Local standard time, as filed.
Dense fog reduced visibilities in some areas to near and below one-quarter mile.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2010Every state in 2010This day in weather historyWarnings in Colorado, February 2010
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: 210570.