A tight pressure gradient ahead of a high pressure moving into the area from the west created strong and gusty winds. The strong winds combined with cold temperatures produced wind chills at or below -25 degrees Fahrenheit.
Every event with a place to put it; 5 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 CYS wrote it up.
A tight pressure gradient ahead of a high pressure moving into the area from the west created strong and gusty winds. The strong winds combined with cold temperatures produced wind chills at or below -25 degrees Fahrenheit.
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 Cheyenne, WY wrote its last area forecast discussion before the first event at Nov 24, 6:36 PM MST, 24 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 631 PM MST WED NOV 24 2010 NEZ002-003-019>021-054-055-095-096-WYZ107-108-118-119-260145- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-EAST PLATTE COUNTY-GOSHEN COUNTY- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 631 PM MST WED NOV 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...SOUTHEAST WYOMING. .DAY ONE...TONIGHT VERY COLD AIR TEMPERATURES ARE EXPECTED TONIGHT WITH WINDS BETWEEN 20 TO 30 MPH AND GUSTS UP TO 40 MPH IN THE EVENING. THIS WILL RESULT IN WIND CHILLS OF 15 TO 25 BELOW ZERO...WITH SOME LOCATIONS NORTH OF THE NORTH PLATTE RIVER VALLEY SEEING WIND CHILLS NEAR 25 BELOW ZERO BY MIDNIGHT. A WIND CHILL ADVISORY HAS BEEN ISSUED FROM 8 PM THIS EVENING THROUGH 8 AM THANKSGIVING DAY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A BITTERLY COLD START TO THANKSGIVING DAY IS EXPECTED WITH LOW TEMPERATURES RANGING IN THE SINGLE DIGITS TO SINGLE DIGITS BELOW ZERO. AREAS ALONG AND NORTH OF THE NORTH PLATTE RIVER VALLEY WILL SEE WIND CHILLS NEAR 25 DEGREES BELOW ZERO DURING THE MORNING HOURS...WITH WIND CHILLS BETWEEN 15 BELOW TO 20 BELOW SOUTH OF THE NORTH PLATTE RIVER. VERY WINDY CONDITIONS WILL CONTINUE THROUGH THE DAY...ESPECIALLY ACROSS WYOMING. THE NEXT STORM SYSTEM WILL BRING ANOTHER ROUND OF LIGHT SNOW ACCUMULATIONS TO THE AREA SUNDAY NIGHT AND MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE URGED TO REPORT SIGNIFICANT WIND GUSTS AND WIND CHILL READINGS OBSERVED OVERNIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ101>106-109>117-260145- CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- CENTRAL CARBON COUNTY-NORTH SNOWY RANGE FOOTHILLS- SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE- UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE-LARAMIE VALLEY- SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- 631 PM MST WED NOV 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TONIGHT VERY COLD AIR WILL SETTLE OVER THE AREA THIS EVENING WITH AREAS OF BLOWING SNOW. AIR TEMPERATURES ARE ALREADY BELOW ZERO IN A FEW LOCATIONS. FRIGID TEMPERATURES ARE EXPECTED TONIGHT WITH LOWS BETWEEN MINUS 5 TO MINUS 15 DEGREES. GUSTY WEST WINDS WILL CONTINUE WITH SUSTAINED WIND SPEEDS BETWEEN 20 TO 35 MPH AND LOCALIZED GUSTS UP TO 55 POSSIBLE. STRONG WINDS COMBINED WITH FRIGID AIR TEMPERATURES WILL CREATE DANGEROUS WIND CHILLS TONIGHT BELOW MINUS 30 DEGREES. WIND CHILLS THIS LOW ARE EXTREMELY DANGEROUS. RESIDENTS ARE URGED TO STAY INDOORS OR ADD EXTRA LAYERS OF CLOTHES TO COVER ALL EXPOSED SKIN IF YOU MUST GO OUTDOORS TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY FRIGID WIND CHILLS BELOW MINUS 30 ARE EXPECTED EARLY THANKSGIVING MORNING WITH AIR TEMPERATURES AROUND 10 BELOW. LOCALIZED BLOWING SNOW IS POSSIBLE ACROSS THE HIGHER MOUNTAIN PASSES THROUGH THANKSGIVING DAY. IN ADDITION...A HIGH WIND WATCH IS IN EFFECT FOR PORTIONS OF THE AREA WITH STRONG WINDS EXPECTED TO CONTINUE THROUGH THANKSGIVING EVENING. THE NEXT STORM SYSTEM WILL BRING ANOTHER ROUND OF LIGHT SNOW ACCUMULATIONS TO THE STATE SUNDAY AND SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE URGED TO REPORT SIGNIFICANT WIND GUSTS AND WIND CHILL TEMPERATURES OBSERVED OVERNIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
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</html>The national radar mosaic for the moment the first event began.
5 cold/wind chill. Local standard time, as filed.
WYDOT sensor at Arlington indicated wind chill readings of -30F to -35F.
Wind chill readings -31F.
Wind chill readings -30F to -35F.
Wind chill readings -30F.
Wind chill readings -30F to -37F.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2010Every state in 2010This day in weather historyWarnings in Wyoming, November 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: 266704, 266706, 266708, 266709, 266712.