A Pacific trough developed into a closed upper low that was centered over southwest Colorado. Significant snowfall occurred over most mountains and some lower elevation areas of western Colorado.
Every event with a place to put it; 12 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 developed into a closed upper low that was centered over southwest Colorado. Significant snowfall occurred over most mountains and some lower elevation areas 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 Nov 1, 2:12 PM MST, 48 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT TUE NOV 1 2011 COZ001>014-017>023-UTZ022>025-027>029-021200- 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- 600 AM MDT TUE NOV 1 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT HAZARDOUS WINTER DRIVING CONDITIONS WILL DEVELOP OVER THE MOUNTAINS THIS AFTERNOON AND EVENING AS A FAST-MOVING STORM AND ACCOMPANYING COLD FRONT MOVE SOUTHEAST ACROSS THE AREA. THIS STORM WILL BRING ACCUMULATING SNOW TO THE MOUNTAINS...GUSTY WINDS AND COLDER TEMPERATURES. FOR DETAILED INFORMATION ON THE WINTER WEATHER ADVISORIES IN EFFECT FOR THE EASTERN UINTA MOUNTAINS...AND THE NORTHERN AND PORTIONS OF THE CENTRAL COLORADO MOUNTAINS...GO TO WEATHER.GOV/GJT ON THE WEB OR SEE THE PRODUCT DENWSWGJT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A STRONGER AND COLDER PACIFIC STORM SYSTEM WILL MOVE ACROSS UTAH AND COLORADO ON FRIDAY AND SATURDAY. HEAVY MOUNTAIN SNOW IS POSSIBLE FRIDAY NIGHT...BUT SLOWLY DIMINISHING ON SATURDAY. THE HEAVIEST SNOW MAY OCCUR OVER THE NORTHERN MOUNTAINS...BUT THE SOUTHERN MOUNTAINS COULD RECEIVE SIGNIFICANT SNOW AS WELL. THE FIRST SIGNIFICANT SNOWFALL OVER NORTHWESTERN COLORADO VALLEYS MAY OCCUR...INCLUDING CRAIG...MEEKER AND STEAMBOAT SPRINGS. ALSO...LIGHT SNOW ACCUMULATIONS IS POSSIBLE ALONG THE INTERSTATE 70 CORRIDOR FROM GRAND JUNCTION TO EAGLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT. HOWEVER... SPOTTERS ARE ENCOURAGED TO REPORT ANY MEASURABLE SNOW ACCUMULATION.
The national radar mosaic for the moment the first event began.
12 winter weather. Local standard time, as filed.
Snowfall of 4 to 9 inches blanketed the area. Winds that gusted from 20 to 45 mph produced areas of blowing and drifting snow.
Snowfall of 5 to 9 inches blanketed the area. Winds that gusted from 20 to 40 mph produced areas of blowing and drifting snow.
Snowfall of 2 to 4 inches blanketed the area. Winds that gusted from 25 to 40 mph produced areas of blowing and drifting snow.
Snowfall of 7 to 12 inches blanketed the area. Winds that gusted from 25 to 35 mph produced localized blowing and drifting snow.
Snowfall of 6 to 10 inches blanketed the area. Winds that gusted from 20 to 55 mph produced localized blowing and drifting snow.
Snowfall of 3 to 8 inches blanketed the area above the 8000 foot level. Winds that gusted from 25 to 45 mph produced areas of blowing and drifting snow.
Snowfall of 4 to 10 inches blanketed the area. Winds that gusted from 30 to 40 mph produced areas of blowing and drifting snow.
Snowfall of 3 to 5 inches occurred across most of the area. Winds that gusted from 25 to 35 mph produced localized blowing and drifting snow.
Snowfall of 5 to 10 inches blanketed the area. Locally heavier amounts included 15 inches at Ouray. Winds that gusted from 30 to 50 mph resulted in extensive blowing and drifting snow.
Snowfall of 3 to 5 inches blanketed the area. Winds that gusted from 20 to 30 mph produced localized blowing and drifting snow.
Snowfall of 2 to 6 inches blanketed the area above the 6000 foot level. Winds that gusted from 30 to 40 mph produced areas of blowing and drifting snow.
Snowfall of 3 to 7 inches blanketed the area. Winds that gusted from 25 to 35 mph produced areas of blowing and drifting snow.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2011Every state in 2011This day in weather historyWarnings in Colorado, November 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: 355413, 355416, 355417, 355421, 355415, 355425, 355418, 355422, 355419, 355423, 355420, 355424.