A large area of freezing drizzle produced over a quarter on an inch of ice accumulation in Lusk.
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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 large area of freezing drizzle produced over a quarter on an inch of ice accumulation in Lusk.
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 Dec 22, 4:53 PM MST, 1 hour 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 453 PM MST WED DEC 22 2010 .UPDATE...FOR AVIATION... .AVIATION...00Z TAF ISSUANCE...DETERIORATING CONDITIONS ONCE AGAIN TONIGHT AS SNOW BEGINS TO MOVE INTO THE MOUNTAINS OF SOUTHEAST WYOMING AND IMPACTS KRWL OVERNIGHT. LIGHT SNOW LOOKS TO MOVE IN AROUND 02Z THEN BECOME MODERATE AT TIMES THROUGH THE NIGHT. KLAR COULD ALSO SEE A LIGHT DUSTING OF SNOW OVERNIGHT IN ADDITION TO SOME PATCHY FOG EARLY IN THE NIGHT. PRECIPITATION WILL THEN SPREAD NORTHEAST UP THROUGH THE NORTHERN NEBRASKA PANHANDLE. AT THIS POINT...BUFKIT SOUNDINGS INDICATE THAT PRECIPITATION OVERNIGHT WILL BE LIGHT...BUT IN THE FORM OF FREEZING RAIN AT KDGW...KTOR THROUGH TO KCDR. A COLD FRONT DROPPING SOUTH THROUGH THE LATE MORNING WILL BRING PRECIP CHANCES SOUTH THROUGH THE REMAINING CWA...BUT WILL LIKELY BE A RAIN/SNOW MIX BY THAT POINT. WINDS WILL SHIFT TO THE NORTH BEHIND THE FRONT WITH ISOLATED SNOW SHOWERS PERSISTING THROUGH THE EVENING. && .PREV DISCUSSION... /ISSUED 300 PM MST WED DEC 22 2010/ SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...TRICKY FORECAST FOR TONIGHT AND TOMORROW. MAIN CONCERN WILL BE SNOW IN THE MOUNTAINS AND THE POTENTIAL FOR FREEZING RAIN IN THE PLAINS TONIGHT. AN UPPER LEVEL LOW WILL MOVE ACROSS THE SOUTHCENTRAL ROCKIES TONIGHT WITH A SFC LOW DEVELOPING IN SOUTHEASTERN COLORADO AND AN INVERTED TROUGH EXTENDING UP INTO SOUTHEAST WYOMING. SOUTHEAST WINDS OVER THE NEBRASKA PANHANDLE HAVE BECOME QUITE BREEZY THIS AFTERNOON AS THE INVERTED TROUGH DEVELOPS AND WILL CONTINUE TO BE SO THROUGH MUCH OF TONIGHT. OROGRAPHIC SNOW SHOWERS WILL DEVELOP LATE THIS AFTERNOON AND CONTINUE THROUGH EARLY THURSDAY IN THE SIERRA MADRE AND SNOWY MOUNTAINS AS A PIECE OF ENERGY BREAKS OFF FROM THE MAIN LOW AND SLIDES TO THE NORTHEAST IN VERY MOIST SOUTHWEST FLOW ALOFT. A WINTER WEATHER ADVISORY FOR SNOW WILL CONTINUE THROUGH THURSDAY AS 6 TO 10 INCHES OF SNOW IS EXPECTED. THIS WAVE WILL ALSO ENHANCE THE LEESIDE LOW PRESSURE TROUGH AND STRENGTHEN WARM AIR ADVECTION AND ISENTROPIC LIFT OVER THE EASTERN PLAINS. THIS IS DEPICTED ON THE 295K AND 300K THETA SURFACES BY BOTH NAM AND GFS WITH AN ELEVATED THETA RIDGE PARKED JUST TO THE LEE OF THE LARAMIE RANGE TONIGHT. EXPECT BELOW FREEZING SFC TEMPERATURES TO REMAIN IN PLACE TONIGHT IN THIS AREA...WHICH COMBINED WITH THE WARMING TEMPS ALOFT ILLUSTRATES A THERMAL PROFILE FAVORABLE FOR FREEZING RAIN. WITH ISENTROPIC LIFT AND SFC CONVERGENCE WITH THE DEEPENING LEESIDE TROUGH STRONGEST ALONG THE NORTHERN TIER OF COUNTIES...ANTICIPATE THE GREATEST ACCUMULATIONS UP IN THIS REGION ALTHOUGH THEY WILL STILL BE ON THE LIGHTER END. STILL...CONDITIONS WILL BE HAZARDOUS IF IN FACT THE FREEZING RAIN MATERIALIZES AS GUIDANCE SUGGESTS. PRECIP WILL THEN TREK SOUTH AS THE MAIN UPPER TROUGH MOVES INTO THE SOUTHERN PLAINS AND A COLD FRONT SLIDES ACROSS THE CWA DURING THE DAY TOMORROW. FREEZING RAIN WILL LIKELY SWITCH TO RAIN OR A MIX OF RAIN AND SNOW THROUGH THE LATE MORNING AS SFC TEMPS WARM AND TEMPS ALOFT COOL. A FEW LINGERING SHOWERS WILL CONTINUE THROUGH THURSDAY NIGHT IN THE WAKE OF THE COLD FRONT WITH SNOW CONTINUING IN THE SIERRA AND SNOWY RANGE. FRIDAY WILL BE MILD AND DRY AS A SHARP UPPER RIDGE BUILDS IN FROM THE WEST. LONG TERM...CHRISTMAS DAY THROUGH THURSDAY LOOKS LIKE MOSTLY MILD WEATHER FROM CHRISTMAS DAY ON THROUGH NEXT WEEK...THOUGH WE COULD SEE SOME PERIODS OF SNOW ACROSS CARBON COUNTY. NO MAJOR SYSTEMS EXPECTED THOUGH THROUGH THIS TIME FRAME. SATURDAY AND SUNDAY...SOUTHEAST WYOMING AND NEBRASKA PANHANDLE LOOKS TO BE DOMINATED BY AN UPPER HIGH PRESSURE RIDGE. MAX TEMPERATURES FOR THE WEEKEND LOOK TO BE MID 40S TO UPPER 40S EAST OF THE LARAMIE RANGE WITH MID TO UPPER 30S WEST. UPPER RIDGE MOVES EAST SUNDAY EVENING AND 700MB WINDS INCREASE OUT OF THE SOUTHWEST SUNDAY EVENING. WOULD EXPECT SOME WINDY CONDITIONS IN OUR USUAL WIND PRONE AREAS SUNDAY NIGHT AND MONDAY MORNING. LOOKS LIKE A MAINLY DRY SHORTWAVE THAT MOVES THROUGH THE AREA MONDAY. LOOKS PRETTY POTENT ON THE GFS AS IT TRACKS THROUGH...BUT WITH LITTLE IN THE WAY OF LOW LEVEL MOISTURE...KEPT ALL LOCATIONS DRY EXCEPT FOR SOME LOW CHANCE POPS IN THE SNOWY AND SIERRA MADRE RANGES. CLOUDY CONDITIONS THOUGH...SHOULD PREVAIL AT MOST LOCATIONS. ANOTHER DRY SHORTWAVE LOOKS TO MOVE THROUGH TUESDAY NIGHT INTO WEDNESDAY. GFS REMAINS DRY WHILE THE ECMWF SHOWS A LITTLE MORE QPF OVER SOUTHERN CARBON COUNTY. INTRODUCED LOW END CHANCE POPS ONCE AGAIN FOR THE SIERRA MADRE AND SNOWY RANGES FOR THIS TIME FRAME. WAY WAY OUT IN THE EXTENDED...BOTH THE GFS AND ECMWF HINTING AT A POSSIBLE MAJOR STORM SYSTEM FOR NEW YEARS EVE. HAVE TO WAIT UNTIL THE EVENT DRAWS A LITTLE CLOSER THOUGH TO GIVE ANY FURTHER DETAILS. FIRE WEATHER...NO FIRE WEATHER CONCERNS EXPECTED THROUGH EARLY FRIDAY AS MOISTURE FROM THE PACIFIC CONTINUES TO STREAM INTO THE DISTRICT. MODERATE SNOW WILL CONTINUE FOR THE MOUNTAINS OF SOUTHEAST WYOMING THROUGH THURSDAY EVENING...WITH LIGHT SNOW AND FREEZING RAIN POSSIBLE FOR THE PLAINS OF WYOMING AND THE NEBRASKA PANHANDLE TONIGHT. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...WINTER WEATHER ADVISORY UNTIL 6 PM THURSDAY FOR WYZ112-WYZ114. NE...NONE. && SHORT TERM/AVIATION/FIRE WEATHER...RJM LONG TERM...CLAYCOMB
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 147 PM MST WED DEC 22 2010 NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-118-119- 232100- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-EAST PLATTE COUNTY-GOSHEN COUNTY- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 147 PM MST WED DEC 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT LIGHT SNOW WILL DEVELOP LATER THIS EVENING WITH SOME AREAS TURNING OVER TO FREEZING RAIN OVERNIGHT. ACCUMULATIONS WILL BE LIGHT OVERALL...WITH THE BEST CHANCE FOR PRECIPITATION IN THE NORTHERN PORTION OF THE FORECAST AREA. PATCHY FOG IS ALSO POSSIBLE OVERNIGHT ALONG AND TO THE EAST OF THE SOUTHERN LARAMIE RANGE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LIGHT SNOW OR FLURRIES MIXED WITH RAIN WILL BE POSSIBLE INTO THURSDAY AFTERNOON WITH LITTLE ACCUMULATION EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ103>106-109>111-113-115>117-232100- 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-UPPER NORTH PLATTE RIVER BASIN- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- 147 PM MST WED DEC 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT LIGHT SNOW WILL DEVELOP THIS EVENING AND CONTINUE OVERNIGHT...WITH 1 TO 2 INCHES OF ACCUMULATION EXPECTED. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LIGHT SNOW WILL CONTINUE THROUGH THURSDAY MORNING. UP TO AN INCH OF ADDITIONAL ACCUMULATION IS POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ112-114-232100- SIERRA MADRE RANGE-SNOWY RANGE- 147 PM MST WED DEC 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT MODERATE SNOW WILL DEVELOP THIS AFTERNOON AND CONTINUE TONIGHT WITH SNOW ACCUMULATIONS OF 3 TO 5 INCHES EXPECTED. A WINTER WEATHER ADVISORY FOR SNOW IS IN EFFECT FOR TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LIGHT TO MODERATE SNOW WILL CONTINUE THROUGH THURSDAY EVENING...WITH AN ADDITIONAL 3 TO 6 INCHES OF ACCUMULATION EXPECTED. THE WINTER WEATHER ADVISORY WILL CONTINUE THROUGH THURSDAY EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 103 PM MST WED DEC 22 2010 WYZ116-222200- SOUTH LARAMIE RANGE- INCLUDING THE CITIES OF...VEDAUWOO...BUFORD...PUMPKIN VINE 103 PM MST WED DEC 22 2010 ...PATCHY DENSE FOG TO CONTINUE THROUGH THE AFTERNOON... AREA WEBCAMS SHOW PATCHY DENSE FOG PERSISTING IN EXTREME SOUTHERN PORTIONS OF THE SOUTHERN LARAMIE RANGE. THIS INCLUDES HIGHWAY 287 NEAR PUMPKIN VINE. DO EXPECT THE FOG TO LIFT WITH VISIBILITIES IMPROVING BY THE LATE AFTERNOON.
The national radar mosaic for the moment the first event began.
1 ice storm. Local standard time, as filed.
Law enforcement reported one quarter inch of ice in and around Lusk.
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, December 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 2026-09-24. Each event’s entry at NCEI: 266900.