A moist and stable airmass resulted in dense fog formation along portions of the lower Colorado River and Yampa River basins of western Colorado.
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.
A moist and stable airmass resulted in dense fog formation along portions of the lower Colorado River and Yampa River basins of western Colorado.
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 23, 6:19 PM MST, 7 hours 41 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 551 AM MST MON FEB 23 2009 COZ001>014-017>023-UTZ022>025-027>029-241245- 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- 551 AM MST MON FEB 23 2009 ...SNOW ADVISORY FOR MOST OF THE MOUNTAINS OF WESTERN COLORADO ABOVE 9000 FEET TODAY AND TONIGHT... .DAY ONE...TODAY AND TONIGHT SNOW WILL BECOME WIDESPREAD ACROSS THE MOUNTAINS OF WESTERN COLORADO TODAY AND CONTINUE TONIGHT. ABOVE 900O FEET...SNOW ACCUMULATIONS WILL GENERALLY RANGE FROM 3 TO 5 INCHES TODAY.... WITH AN ADDITIONAL 2 TO 4 INCHES TONIGHT. WEST TO SOUTHWEST WIND GUSTS OF 30 TO 40 MPH WILL CAUSE BLOWING AND DRIFTING SNOW. OTHERWISE...LIGHT VALLEY RAIN IS EXPECTED ACROSS EASTERN UTAH AND WESTERN COLORADO...WITH MIXED SNOW AND RAIN AT THE MID ELEVATIONS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THERE IS A CHANCE OF MOUNTAIN SNOW AND BLOWING SNOW EACH DAY THROUGH SATURDAY...AND A CHANCE OF RAIN OR MIXED RAIN AND SNOW EACH DAY IN THE VALLEYS THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. HOWEVER... REPORTS OF SNOWFALL AMOUNTS AND SIGNIFICANT RAINFALL AMOUNTS WOULD BE APPRECIATED. TGJT
The national radar mosaic for the moment the first event began.
3 dense fog. Local standard time, as filed.
Dense fog reduced visibilities to 1/4 mile or less over portions of the area.
Dense fog reduced visibilities over some areas to 1/4 mile or less.
Dense fog reduced visibilities to 1/4 mile or less in some areas.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2009Every state in 2009This day in weather historyWarnings in Colorado, February 2009
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: 150887, 150888, 150889.