Gap flow and mountain wave activity brought high wind to areas west of Clark. Several gusts over 60 mph were recorded with the highest topping out at 82 mph.
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The episode as NWS RIW wrote it up.
Gap flow and mountain wave activity brought high wind to areas west of Clark. Several gusts over 60 mph were recorded with the highest topping out at 82 mph.
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 Riverton, WY wrote its last area forecast discussion before the first event at Nov 24, 2:22 PM MST, 7 hours 32 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 222 PM MST THU NOV 24 2011 .SHORT TERM...TONIGHT THROUGH SUNDAY A PACIFIC TROUGH MOVING INTO THE PACIFIC NORTHWEST WILL MOVE RAPIDLY EAST BRINGING SNOW TO WESTERN WYOMING LATER THIS EVENING. THE SNOWFALL WILL CONTINUE THROUGH FRIDAY. ALONG WITH THE SNOW WINDY CONDITIONS ARE EXPECTED OVER THE MOUNTAINS WITH BLOWING AND DRIFTING SNOW. WINTER WEATHER ADVISORIES ARE IN EFFECT FOR YELLOWSTONE NATIONAL PARK...TETON COUNTY AND THE STAR VALLEY FOR LATE THIS EVENING THROUGH FRIDAY. AS THE TROUGH APPROACHES HIGH WINDS ARE EXPECTED EAST OF THE CONTINENTAL DIVIDE IN PARK COUNTY ALONG THE EAST SLOPES OF THE ABSAROKA MOUNTAINS AND THE CODY FOOTHILLS WITH A HIGH WIND WARNING IN EFFECT TONIGHT. STRONG WINDS WILL SPREAD EAST THROUGH FRIDAY AND FRIDAY EVENING WHILE A COLD FRONT PASSES THROUGH FROM THE NORTHWEST TO SOUTHEAST ACROSS THE AREA. SOME SNOWFALL WILL SPREAD EAST OF THE CONTINENTAL DIVIDE BUT MOST OF IT WILL BE LIMITED TO THE MOUNTAIN AREAS. TEMPERATURES WILL COOL BEHIND THE COLD FRONT FOR LATE FRIDAY NIGHT...SATURDAY AND SATURDAY NIGHT. CONDITIONS WILL BE DRY WITH CLEARING. WARMING WILL OCCUR ON SUNDAY AS WEST FLOW ALOFT PICKS BACK UP AND DOWNSLOPE WARMING OCCURS. .LONG TERM...SUNDAY NIGHT THROUGH THURSDAY THE RIDGE OVER THE WESTERN CONUS WILL BREAK DOWN ON MONDAY AS A CLIPPER SYSTEM MOVES SOUTHEASTWARD ACROSS SOUTHERN CANADA. THIS SYSTEM WILL PUSH A COLD FRONT TOWARD THE AREA FROM THE NORTH POTENTIALLY BRINGING SOME LIGHT SNOW TO THE NORTHERN AND WESTERN MOUNTAINS. THE MAIN LOW REMAINS WELL REMOVED FROM THE FRONT SO A SIGNIFICANT COOL DOWN IS UNLIKELY AS THE COLD AIR MASS REMAINS TO THE NORTH. AFTER A BRIEF TRANSITORY RIDGE OF TUESDAY...A MORE VIGOROUS SHORTWAVE MOVES IN FROM THE PACIFIC NORTHWEST. LOW CONFIDENCE IN THE TIMING OF THIS FEATURE AS MODELS HAVE BEEN DIFFERING AND INCONSISTENT. GFS SOLUTION BRINGS THE WAVE THROUGH DURING THE DAY WEDNESDAY WHILE THE ECMWF AND GEM BRING THE WAVE THROUGH LATER. MODEL DISAGREEMENT REDUCES CONFIDENCE IN FORECAST FURTHER FOR THURSDAY. HAVE SIDED WITH THE ECMWF SOLUTION IN KEEPING TEMPERATURES LOWER AND A CHANCE FOR PRECIPITATION ACROSS THE AREA FOR THURSDAY. && .AVIATION.../00Z ISSUANCE/ WINDY CONDITIONS WILL CONTINUE ALONG THE KJAC TO KCOD AND KRKS TO KCOD CORRIDORS THROUGH MUCH OF THE FORECAST PERIOD. TURBULENCE DUE TO MOUNTAIN WAVE ACTIVITY CAN BE EXPECTED ALONG AND LEE OF THE ABSAROKA RANGE...PARTICULARLY IN THE KCOD AREA. VFR CONDITIONS WILL PERSIST ACROSS THE AREA UNTIL 03Z WHEN CIGS DECREASE OVER WESTERN WYOMING. A STORM SYSTEM WILL MOVE INTO THE AREA CAUSING CONDITIONS TO DETERIORATE TO MVFR/IFR WITH MOUNTAIN OBSCURATIONS ACROSS THE WEST. IFR CONDITIONS ARE LIKELY AT KAFO AND KJAC BY 07Z IN -SN AND BLSN AS WINDS INCREASE IN THE WESTERN VALLEYS. A COLD FRONT WILL MOVE INTO THE NORTH AFTER 18Z TURNING WIND TO THE NORTH IN THE BIG HORN AND POWDER RIVER BASINS. THE FRONT WILL REACH KRIW...KLND...AND KCPR AROUND 00Z. && .FIRE WEATHER... COOL WINTER WEATHER WILL CONTINUE ACROSS WESTERN AND CENTRAL WYOMING WITH SNOWFALL PICKING UP IN THE WESTERN MOUNTAINS TONIGHT AND CONTINUING THROUGH FRIDAY. THE SNOWFALL WILL SPREAD EAST OF THE CONTINENTAL DIVIDE BUT WEAK AND DECREASE IN COVERAGE LATER FRIDAY AND FRIDAY NIGHT. WINDY CONDITIONS WILL INCREASE IN AND NEAR THE MOUNTAINS AND EASTERN SLOPES AND THROUGH THE WIND CORRIDOR. OVERALL FAVORABLE RELATIVE HUMIDITY IS EXPECTED. && .RIW WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING FROM 8 PM THIS EVENING TO 6 AM MST FRIDAY WYZ002-003. WINTER WEATHER ADVISORY FROM 11 PM THIS EVENING TO 5 PM MST FRIDAY WYZ001-012-013-023. && SHORT TERM...C.BAKER LONG TERM...BERC AVIATION...BERC FIRE WEATHER...C.BAKER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 240 PM MST THU NOV 24 2011 WYZ001>020-022>030-251400- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 240 PM MST THU NOV 24 2011 ...HIGH WIND WARNING THE CODY FOOTHILLS AND ADJACENT ABSAROKA MOUNTAINS FOR TONIGHT WITH WINTER WEATHER ADVISORIES FOR THE WESTERN MOUNTAINS AND VALLEYS LATER TONIGHT AND FRIDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT VERY STRONG WINDS MAY DEVELOP ACROSS THE CODY FOOTHILLS AND ADJACENT ABSAROKA MOUNTAINS TONIGHT. SNOW AND BLOWING SNOW WILL INCREASE ACROSS THE WESTERN MOUNTAINS AND VALLEYS OF WYOMING TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SIGNIFICANT SNOW ACCUMULATION EXPECTED ACROSS FAR WESTERN WYOMING FRIDAY. STRONG WINDS WILL BLOW ACROSS CENTRAL WYOMING FRIDAY AND FRIDAY EVENING AHEAD OF A FAST MOVING COLD FRONT. THE STRONGEST WINDS ARE EXPECTED IN SWEETWATER...SOUTHERN FREMONT AND NATRONA COUNTIES... AND NORTHERN JOHNSON COUNTY. VERY STRONG WINDS MAY DEVELOP AGAIN ACROSS THE CODY FOOTHILLS LATER SUNDAY INTO SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT WIND GUSTS IN EXCESS OF 45 MPH AS WELL AS ANY SNOW ACCUMULATION. THANK YOU. TEAM RIVERTON
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
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, 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 2026-09-24. Each event’s entry at NCEI: 354608.