Strong southwest winds developed in the wind prone area of southeast Wyoming.
Every event with a place to put it; 2 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.
Strong southwest winds developed in the wind prone area of southeast Wyoming.
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 Jan 14, 9:26 PM MST, 1 hour 5 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 926 PM MST FRI JAN 14 2011 .UPDATE...MINOR CHANGES TO GRIDDED FORECASTS FOR THE REST OF THE NIGHT BASED ON TRENDS AND 00Z MODEL GUIDANCE. && .AVIATION...06Z TAFS. TONIGHT...INCREASING MID CLOUD DECK THIS EVENING ABOVE 12000 FEET AGL WITH CLOUD DECK BECOMING BROKEN. ACROSS CARBON COUNTY AND THE RAWLINS SITE...EXPECT PERIODIC MVFR CEILINGS WITH ISOLATED SNOW SHOWERS RESTRICTING VISIBILITIES TO 5 MILES AT TIMES. SCATTERED SNOW SHOWERS ACROSS THE SNOWY AND SIERRA MADRE RANGES WILL OBSCURE THE MOUNTAINS AND PRODUCE LIFR AND IFR. SATURDAY AND SATURDAY EVENING...CONTINUED BROKEN DECK OF MID CLOUDS ABOVE 12000 FEET AGL. CEILINGS RISING TO VFR AT RAWLINS. SNOW SHOWERS DECREASING IN COVERAGE ACROSS THE SNOWY AND SIERRA MADRE RANGES WITH MOUNTAINS OCCASIONALLY OBSCURED IN LIFR AND IFR CEILINGS AND VISIBILITIES. && .PREV DISCUSSION... /ISSUED 437 PM MST FRI JAN 14 2011/ UPDATE...SEE BELOW FOR 00Z TAF DISCUSSION. AVIATION...00Z TAFS. TONIGHT...INCREASING MID CLOUD DECK THIS EVENING ABOVE 12000 FEET AGL WITH CLOUD DECK BECOMING BROKEN. ACROSS CARBON COUNTY AND THE RAWLINS SITE...EXPECT PERIODIC MVFR CEILINGS WITH ISOLATED SNOW SHOWERS RESTRICTING VISIBILITIES TO 5 MILES AT TIMES. SCATTERED SNOW SHOWERS ACROSS THE SNOWY AND SIERRA MADRE RANGES WILL OBSCURE THE MOUNTAINS AND PRODUCE LIFR AND IFR. SATURDAY...CONTINUED BROKEN DECK OF MID CLOUDS ABOVE 12000 FEET AGL. CEILINGS RISING TO VFR AT RAWLINS. SNOW SHOWERS DECREASING IN COVERAGE ACROSS THE SNOWY AND SIERRA MADRE RANGES WITH MOUNTAINS OCCASIONALLY OBSCURED IN LIFR AND IFR CEILINGS AND VISIBILITIES. PREV DISCUSSION... /ISSUED 305 PM MST FRI JAN 14 2011/ SHORT TERM...TONIGHT THROUGH SUNDAY FAST NORTHWEST WIND FLOW ALOFT WILL CONTINUE OVER THE CWA THROUGH 00Z MONDAY AND BEYOND. ONE SHORTWAVE TROUGH MOVED ACROSS THE CWA EARLY THIS MORNING WITHIN THAT FLOW. THE NEXT SHORTWAVE TROUGH WHICH IS CURRENTLY UPSTREAM FROM WESTERN MONTANA TO OREGON EARLY THIS AFTERNOON AND WILL MOVE ACROSS THE REGION TONIGHT. THE FEATURE WILL INCREASE CLOUD COVER AND BRING SOME LIGHT SNOW TO THE HIGHER ELEVATIONS. THE NEXT SHORTWAVE TROUGH WILL MOVE ACROSS THE CWA SATURDAY NIGHT AND EARLY SUNDAY MORNING. MODELS CONTINUE TO PRODUCE MORE WIDESPREAD SNOW OVER AND NEAR THE MOUNTAINS DURING THAT TIME...WITH THE NAM SPREADING THE QPF OVER MUCH MORE OF SOUTHEAST WYOMING THAN THE OTHER MODELS. HAVE TRENDED POPS UP OVER THE WEST PART OF THE CWA SATURDAY NIGHT AND SUNDAY...WITH OROGRAPHICS TAKING OVER ON SUNDAY. AT THIS TIME...HAVE 3 TO 5 INCHES IN THE FORECAST FOR SATURDAY NIGHT AND SUNDAY WHICH IS IN LINE WITH THE HPC NUMBERS. WILL HOLD OFF ON THE ISSUANCE OF ANY WINTER HIGHLIGHTS FOR THE MOUNTAINS AT THIS TIME AS THE ACCUMULATING SNOW WILL CONTINUE INTO THE LONG TERM PART OF THE FORECAST. THE SHALLOW COLD FRONT CURRENTLY OVER NORTHERN SOUTH DAKOTA AND FAR NORTHERN WYOMING WILL CONTINUE TO SLOWLY PUSH SOUTH THROUGH EARLY TONIGHT. MODELS PLACE THE BOUNDARY OVER THE NORTHEAST THIRD OF THE CWA BY 06Z. THE BOUNDARY THEN ERODES EAST LATE TONIGHT AND SATURDAY BEFORE BEING REINFORCED AND MOVING BACK WEST AND INTO THE EAST PART OF THE CWA SATURDAY NIGHT. THE BOUNDARY WILL THEN BE PUSHED BACK EAST DURING THE DAY ON SUNDAY. TO THE EAST OF THE BOUNDARY WILL BE LOW CLOUDS...FOG...FLURRIES AND POSSIBLY FREEZING DRIZZLE. QUESTION IS WHERE THE BOUNDARY WILL ACTUALLY END UP. LAST NIGHT...THE FRONT DID NOT MAKE IT INTO THE CWA AT ALL AND WAS FURTHER EAST THAN THE MODELS INDICATED. THE WEATHER ASSOCIATED WILL BE IN THE DEEPER COLD AIR FURTHER EAST OF THE FRONT AND MAY NOT REALLY AFFECT THE CWA. WESTERLY WINDS WILL REMAIN FAIRLY STRONG ALONG AND WEST OF THE LARAMIE RANGE THROUGH SUNDAY. THE LOW LEVEL HEIGHT DIFFERENCES INCREASE AND THE SURFACE PRESSURE GRADIENT TIGHTENS FOR A BRIEF TIME TONIGHT AND THEN BECOMES FAVORABLE FOR HIGH WINDS SUNDAY AND POSSIBLY AS EARLY AS LATE SATURDAY NIGHT. ON SUNDAY...THE 700 MB WINDS INCREASE TO AROUND 60 KNOTS OVER SOUTHEAST WYOMING. WILL HOLD OFF ON THE ISSUANCE OF A HIGH WIND WATCH AS IT WILL BE MAINLY IN THE 4TH AND 5TH PERIODS. THE STRONG WINDS WILL ALSO PRODUCE BLOWING AND DRIFTING SNOW OVER THE WEST PART OF THE CWA ON SUNDAY. LONG TERM...SUNDAY NIGHT THROUGH FRIDAY THE MAIN FORECAST CHALLENGES DURING THIS FORECAST PERIOD WILL BE WINDS...POPS AND TEMPERATURES. GENERALLY TRENDED TOWARD CONSENSUS MOS GUIDANCE. THE MID/UPPER LEVEL PATTERN WILL FEATURE A QUASI STATIONARY HIGH PRESSURE SYSTEM OVER THE EASTERN PACIFIC AND A DEEP AND PERSISTENT POLAR VORTEX OVER EASTERN CANADA. THE FLOW ALOFT BETWEEN THESE TWO SYSTEMS WILL BE NORTHWESTERLY OVER THE FORECAST AREA. THIS WILL ALLOW PERIODIC ARCTIC COLD FRONTS TO DROP SOUTH AND SOUTHEAST FROM THE CANADIAN PRAIRIES ACROSS THE NORTH CENTRAL CONUS. THERE CONTINUES TO BE CONSISTENCY FROM THE 12Z GFS AND ECMWF WITH THE TIMING OF THE FIRST COLD FRONTAL PASSAGE...BUT DIFFER IN THE POSITION OF THE FRONT. THE ECMWF HAS BEEN TRENDING FURTHER WEST THAN THE GFS...WITH THE FRONT CLIPPING THE PANHANDLE ZONES MONDAY NIGHT AND TUESDAY. PRIOR TO THE FRONT'S ARRIVAL...A TIGHT SURFACE PRESSURE GRADIENT AND 700 MB WINDS OF 50 KT WILL PRODUCE STRONG AND GUSTY WINDS FOR AREAS IN THE VICINITY OF THE LARAMIE RANGE SUNDAY NIGHT AND MONDAY. INCREASING MOISTURE AND FAVORABLE OROGRAPHIC FLOW WILL PRODUCE PERIODS OF RAIN/SNOW FOR THE LOWER ELEVATIONS WITH HIGHER ELEVATION SNOWFALL SUNDAY NIGHT THROUGH MONDAY NIGHT. SNOW ACCUMULATIONS WILL RANGE FROM 2 TO 4 INCHES WITH LOCALLY HIGHER AMOUNTS FOR NORTHWEST AND WEST FACING SLOPES. LITTLE OR SNOW ACCUMULATION IS EXPECTED FOR AREAS EAST OF THE LARAMIE RANGE. PRECIPITATION ENDS TUESDAY FOR ALL BUT THE MOUNTAINS IN CARBON COUNTY DUE TO MOIST NORTHWEST UPSLOPE FLOW. THE COLD FRONT THEN SURGES EAST ACROSS THE PLAINS AND MIDWEST TUESDAY AFTERNOON AND NIGHT...THEN ATTENTION IS DIRECTED TO THE NEXT STRONGER COLD FRONT WHICH LOOKS TO TAKE A MORE SOUTHWARD PATH ACROSS THE CWA PER THE ECMWF WEDNESDAY THROUGH THURSDAY MORNING...AND A GLANCING BLOW FOR THE EASTERN CWA BY THE GFS. MOISTURE ONCE AGAIN INCREASES AREAWIDE DURING THIS TIME...WITH HIGHER POPS AND QPF TARGETED FOR THE SNOWY AND SIERRA MADRE RANGES. LIKE ITS PREDECESSOR...THIS FRONT WILL THEN SLIDE EAST ACROSS THE PLAINS THURSDAY NIGHT AND FRIDAY. DRIER CONDITIONS RETURN TO ALL BUT THE SIERRA MADRE AND SNOWY RANGES WHERE ISOLATED SNOW SHOWERS WILL BE POSSIBLE DUE TO OROGRAPHIC FLOW. TEMPERATURES MONDAY AND TUESDAY WILL BE 5 TO 10 DEGREES ABOVE SEASONAL NORMALS...COOL BACK TO NORMAL WEDNESDAY AND THURSDAY...AND MODERATE BACK TO A FEW DEGREES ABOVE NORMAL. AVIATION...18Z TAF ISSUANCE AREAS OF STRATUS WILL CAUSE PERIODIC MVFR CIGS AT KRWL THIS AFTERNOON AND TONIGHT. OUTSIDE THE LOW CLOUDS OVER CARBON COUNTY...VFR CONDITIONS WILL PREVAIL THROUGH TONIGHT. SOME OF THE MODELS ARE PREDICTING PATCHY FOG AND SOME LOW CLOUDS OVER PORTIONS OF THE NEBRASKA PANHANDLE LATER TONIGHT AND EARLY SATURDAY MORNING...BUT WILL HOLD OFF UNTIL THE 18Z MODEL DATA ARRIVES. WESTERLY WINDS WILL BE GUSTING TO 30 KT OVER PORTIONS OF SOUTHEAST WYOMING THIS AFTERNOON BEFORE DIMINISHING AROUND SUNSET. THERE WILL BE PERIODS OF LIGHT SNOW OCCASIONALLY OBSCURING THE SNOWY AND SIERRA MADRE MOUNTAINS TONIGHT AND SATURDAY MORNING. FIRE WEATHER... WESTERLY SURFACE WINDS WILL GUST BETWEEN 40 AND 50 MPH THROUGH THE WEEKEND IN AREAS ALONG AND WEST OF THE LARAMIE RANGE. SOME LIGHT MOUNTAIN SNOW WILL BE POSSIBLE AT TIMES THROUGH NEXT WEEK...WITH MUCH OF THE REST OF THE CWA DRY. TEMPERATURES WILL ALSO REMAIN MILD THROUGH NEXT WEEK WITH MINIMUM RELATIVE HUMIDITIES OVER THE SOUTHEAST WYOMING PLAINS BETWEEN 30 AND 40 PERCENT EACH DAY. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION... LONG TERM...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1028 AM MST FRI JAN 14 2011 NEZ002-003-019>021-054-055-095-096-WYZ101-102-104-105-107>109-111- 113-115-118-119-151015- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN- EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY- SOUTHWEST CARBON COUNTY-UPPER NORTH PLATTE RIVER BASIN- LARAMIE VALLEY-CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 1028 AM MST FRI JAN 14 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE...EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY WEST TO SOUTHWEST WINDS ARE EXPECTED TO INCREASE IN SPEED SATURDAY NIGHT AND PERSIST INTO MONDAY. SUSTAINED WINDS OF 25 TO 35 MPH WITH GUSTS TO 45 MPH WILL BE COMMON ACROSS SOUTHEAST WYOMING AND COULD FILTER INTO THE PANHANDLE SUNDAY. THESE WINDS ARE EXPECTED TO REMAIN QUITE GUSTY THROUGH MUCH OF NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ103-106-110-116-117-151015- NORTH LARAMIE RANGE- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTH LARAMIE RANGE- SOUTH LARAMIE RANGE FOOTHILLS- 1028 AM MST FRI JAN 14 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT WEST TO SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS UP TO TO 45 MPH WILL OCCUR OVER AND NEAR THE LARAMIE RANGE AND THE ARLINGTON AREA THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY WEST TO SOUTHWEST WINDS ARE EXPECTED TO INCREASE IN INTENSITY SATURDAY NIGHT AND PERSIST INTO MONDAY. SUSTAINED WINDS OF 35 TO 45 MPH WITH GUSTS TO 70 MPH ARE POSSIBLE DURING THIS TIME. THESE WINDS ARE EXPECTED TO REMAIN QUITE GUSTY THROUGH NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ112-114-151015- SIERRA MADRE RANGE-SNOWY RANGE- 1028 AM MST FRI JAN 14 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT AREAS OF LIGHT SNOW OR FLURRIES WILL OCCUR OVER MAINLY THE HIGHER ELEVATIONS OF THE SNOWY AND SIERRA MADRE RANGES THROUGH TONIGHT. UP TO AN INCH OF NEW SNOW IS POSSIBLE ABOVE 9000 FEET. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY WEST TO SOUTHWEST WINDS ARE EXPECTED TO INCREASE IN SPEED SATURDAY NIGHT AND PERSIST INTO MONDAY. SUSTAINED WINDS OF 35 TO 45 MPH WITH GUSTS TO 70 MPH ARE POSSIBLE DURING THIS TIME. THESE WINDS ARE EXPECTED TO REMAIN QUITE GUSTY THROUGH NEXT WEEK. ACCUMULATING SNOWS ARE ONCE AGAIN POSSIBLE SUNDAY NIGHT INTO MONDAY OVER THE SNOWY AND SIERRA MADRE RANGES. THIS SNOW...COMBINED WITH THE STRONG WINDS...COULD PRODUCE WHITE OUT CONDITIONS SUNDAY NIGHT INTO MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WEILAND
The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
WYDOT sensor at Arlington recorded sustained winds in excess of 40 mph and wind gusts greater than 58 mph throughout the period with a peak gust of 61 mph at 14/2256 MST.
WYDOT sensor at Bordeaux recorded sustained winds in excess of 40 mph and gusts greater than 58 mph with a peak gust of 60 mph at 15/0900 MST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2011Every state in 2011This day in weather historyWarnings in Wyoming, January 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 2026-09-24. Each event’s entry at NCEI: 268944, 268948.