A cattle truck was toppled by high wind near milepost 58 along State Highway 28 on the northeast side of South Pass.
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The episode as NWS RIW wrote it up.
A cattle truck was toppled by high wind near milepost 58 along State Highway 28 on the northeast side of South Pass.
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 Dec 14, 3:02 PM MST, 38 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 302 PM MST TUE DEC 14 2010 .SHORT TERM...TONIGHT THROUGH FRIDAY WINTER STORM JUST NOW MOVING INTO THE WEST WITH GENERALLY LIGHT SNOW FALLING IN THE NW AND GRADUALLY WORKING SWD. TEMPERATURES SOARED INTO THE LOWER 40S IN THE WRN VALLEYS BRIEFLY BUT SNOW BEGAN QUICKLY IN THE JACKSON VALLEY AND TEMPS FELL BACK INTO THE MID 30S. THE STAR VALLEY IS STILL IN THE UPPER 30S TO NEAR 40 BUT ONCE THE PRECIP MOVES IN FROM ERN IDAHO...THE SNOW WILL LIKELY DEVELOP JUST AS QUICKLY AS IT DID IN THE JACKSON VALLEY. SHOULD BE A GOOD SHOT OF SNOW OVERNIGHT WITH ADVISORY AMOUNTS COVERING MUCH OF THE AREA. COMBINATION OF SNOW AND WIND...ESPECIALLY THIS EVENING... SHOULD MAKE FOR A DECENT WINTER STORM THROUGH AT LEAST THIS EVENING WITH SNOW CONTINUING INTO WEDNESDAY MORNING. AIRMASS IS RATHER WARM INITIALLY BUT THEN WE GET SOME OPTIMAL TEMPS FOR MAX DENDRITIC GROWTH THIS EVENING. NOT REAL IMPRESSED WITH POTENTIAL FOR WIDESPREAD WINTER STORM WARNING AMOUNTS IN ZONE 12 BUT AT LEAST WE'LL HAVE SNOW AND WIND AND A FEW AREAS UP NEAR OR AROUND A FOOT. WINDS ARE ALSO A CONCERN THROUGH THE EARLY EVENING IN THE ABSAROKAS AND EAST SLOPE OF THE WIND RIVERS. WIND RIVER RAWS IS GUSTING NEAR 60 MPH AND LND JUST GUSTED TO 45 MPH. WILL KEEP THE HIGH WIND WARNING GOING THROUGH 03Z. CPR ACTUALLY GUSTED TO 43KTS SO FAR WHICH IS STRONGER THAN ALL BUT FALES ROCK. SHOULD CONTINUE WINDY THERE THROUGH THE EARLY EVENING BEFORE DECREASING. ONLY LOCALIZED HIGH WINDS ARE EXPECTED NEAR OUTER DRIVE AND AROUND FALES ROCK. OTHER AREAS SHOULD BE IN THE 40 TO 55 MPH RANGE WITH GUSTS. LATER TONIGHT...THE FRONT WILL EDGE INTO THE NRN ZONES WITH SNOW DEVELOPING AND THEN SPREADING SOUTH TO CASPER. MANY AREAS WILL SEE 1 TO 3 INCHES FROM THE NRN AND ERN BIG HORN BASIN OVER TO JOHNSON COUNTY AND SOUTH TO NATRONA. POTENTIAL FOR MORE AROUND CPR WITH 2 TO 4 INCHES QUITE POSSIBLE. NEXT SHIFT CAN LOOK AT THE POTENTIAL FOR A SHORT ADVISORY THERE OF 8 TO 12 HOURS. COLD AIR COMES IN BEHIND THIS SYSTEM WITH -30 TO -32C AT H5 AND -13 TO -15C AT H7. HIGH TEMPERATURES WILL STEADILY COOL THE NEXT FEW DAYS AS WILL OUR LOWS. ANOTHER WEAK SHORTWAVE MOVES THROUGH THURSDAY WITH A POCKET OF -30 TO -32C AIR AT H5 WHICH SHOULD RESULT IN SCT MTN SNOW SHOWERS AND MAYBE EVEN A FEW TRYING TO GET OFF THE HILLS IN CENTRAL WYO. ANOTHER WEAKER SYSTEM COMES THROUGH FRIDAY TO REINFORCE THE COLD AIR. MUCH COLDER LOWS WEDNESDAY NIGHT AND THURSDAY NIGHT WITH SINGLE DIGITS ABOVE TO SINGLE DIGITS BELOW ZERO QUITE COMMON. .LONG TERM...FRIDAY NIGHT THROUGH TUESDAY A PERSISTENT LONGWAVE TROUGH/UPPER LOW WILL REMAIN ACROSS EXTREME EASTERN PACIFIC...BECOMING MORE AMPLIFIED MONDAY AND TUESDAY. THIS UPPER LOW/TROUGH WILL RESULT IN A GOOD FETCH OF PACIFIC MOISTURE IN EITHER SOUTHWEST OR WEST FLOW...WITH PERIODS OF SIGNIFICANT SNOWFALL POSSIBLE WEST OF THE DIVIDE THIS WEEKEND INTO EARLY NEXT WEEK...WITH MAINLY DRY CONDITIONS EAST OF THE DIVIDE. HOWEVER...THE EXTENDED WILL BEGIN ON THE DRY SIDE FRIDAY WITH LOW AMPLITUDE RIDGING OVER THE NORTHERN ROCKIES. CURRENTLY IT APPEARS THE BEST CHANCE OF PRECIPITATION THIS WEEKEND WILL BE SATURDAY AFTERNOON INTO SATURDAY NIGHT. A LULL IS EXPECTED TO DEVELOP LATE SUNDAY THROUGH MONDAY...AS THE TROUGH IN THE EASTERN PACIFIC AMPLIFIES WITH DOWNSTREAM RIDING DEVELOPING IN RESPONSE OVER THE ROCKIES. HOWEVER...GLOBAL MODELS SHOW SNOW RETURNING IN EARNEST MONDAY NIGHT/TUESDAY...AS MOIST SOUTHWEST FLOW AHEAD OF THIS TROUGH AFFECTS WESTERN WYOMING. WILL HAVE HIGHER/LOWER POPS FOR EXPECTED PEAKS/LULLS RESPECTIVELY...BUT WILL HAVE POPS CONTINUOUSLY ACROSS THE WEST AFTER FRIDAY NIGHT DUE TO ADEQUATE MOISTURE AND FAVORABLE WIND FLOW THROUGH THE PERIOD AND TIMING ISSUES THIS FAR OUT. TEMPERATURES...ESPECIALLY EAST OF THE DIVIDE WILL BE A CHALLENGE AS GLOBAL MODELS KEEP THE ARCTIC AIR JUST NORTH/NORTHEAST OF THE FORECAST AREA FOR MUCH OF THE PERIOD...BUT COULD SETTLE INTO THE AREA ESPECIALLY ON SUNDAY. && .AVIATION... A VIGOROUS FAST MOVING PACIFIC TROUGH OF LOW PRESSURE AND ASSOCIATED COLD FRONT WILL PRODUCE A RELATIVELY QUICK SHOT OF MODERATE TO HEAVY SNOWFALL ACROSS FAR WESTERN WYOMING THROUGH TONIGHT. MODERATE RAIN AND SNOW WILL CONTINUE IN THE FAR WEST VALLEYS INCLUDING KJAC FOR THE REMAINDER OF THIS AFTERNOON WITH MVFR/IFR CONDITIONS AND MTN OBSCURATIONS BEFORE CHANGING TO ALL SNOW AROUND SUNSET. EXPECT WIDESPREAD IFR/LIFR CONDITIONS AND MOUNTAIN OBSCURATIONS IN THE WESTERN MOUNTAINS THROUGH TONIGHT ALONG WITH CONSIDERABLE BLOWING AND DRIFTING SNOW. AS TEMPERATURES CONTINUE TO FALL IN THE LOWER ELEVATIONS AND SOUTH WINDS OF 15 TO 25 MPH WITH GUSTS TO 35 MPH CONTINUE...BLOWING AND DRIFTING SNOW WILL DEVELOP PRODUCING WIDESPREAD IFR/LIFR CONDITIONS IN THE VALLEYS LATER THIS EVENING AND THROUGH THE REST OF TONIGHT. EXPECT SOME GUSTS OF 40 MPH IN THE HIGHER EXPOSED ELEVATIONS. SNOW WILL BEGIN TO DECREASE IN INTENSITY BY SUNRISE IN WESTERN WYOMING ENDING FROM NORTHWEST TO SOUTHEAST WEDNESDAY MORNING. EAST OF THE CONTINENTAL DIVIDE...VERY WINDY CONDITIONS ACROSS THE ABSAROKA AND EAST SLOPE OF THE WIND RIVER MOUNTAINS ARE EXPECTED TO CONTINUE THROUGH 03Z THIS EVENING WITH WEST SOUTHWEST WINDS OF 50 MPH ALONG WITH GUSTS OF UP TO 75 MPH EXPECTED. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS OF 45 TO 55 MPH CAN BE EXPECTED TO CONTINUE FROM THE RED DESERT TO THE VICINITY OF KCPR THROUGH 03Z THIS EVENING. A COLD FRONT WILL PUSH SOUTH ACROSS NORTHERN WYOMING LATE TONIGHT AND ACROSS CENTRAL WYOMING SOUTH OF THE OWL CREEK MTNS BY 12Z WEDNESDAY MORNING. WIDESPREAD LIGHT SNOW CAN BE EXPECTED ALONG AND BEHIND THE FRONT ALONG WITH MVFR/IFR CONDITIONS ALONG WITH MTNS OBSCURATIONS. KCPR IS EXPECTED TO BE THE MOST IMPACTED BY THIS SNOWFALL WEDNESDAY MORNING EAST OF THE DIVIDE. THE SNOWFALL WILL CONTINUE TO DIMINISH IN WESTERN WYOMING WEDNESDAY AFTERNOON WITH SNOW TAPERING OFF EAST OF THE DIVIDE. && .FIRE WEATHER... WINTER STORM TO IMPACT THE WEST THROUGH TONIGHT WITH STRONG TO HIGH WINDS ALONG THE LEE OF THE CENTRAL MTNS. SNOW WILL SPREAD EAST OF THE DIVIDE LATER TONIGHT ACROSS THE NORTH AND THEN SPREAD SOUTH TO CPR BY EARLY MORNING. MUCH COLDER AIR WITH LESS WIND WILL DEVELOP WEDNESDAY THROUGH THURSDAY. && .RIW WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING UNTIL 8 PM MST THIS EVENING WYZ002-015. WINTER WEATHER ADVISORY UNTIL 8 AM MST WEDNESDAY WYZ013-014-023>025. WINTER STORM WARNING UNTIL 8 AM MST WEDNESDAY WYZ012. WINTER WEATHER ADVISORY UNTIL 5 AM MST WEDNESDAY WYZ001. && SHORT TERM...SKRBAC LONG TERM...WM AVIATION...LIPSON FIRE WEATHER...SKRBAC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 1123 AM MST TUE DEC 14 2010 WYZ001>020-022>030-151200- 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- 1123 AM MST TUE DEC 14 2010 ...WINTER STORM WARNING IN EFFECT FOR YELLOWSTONE AS WELL AS THE TETON AND GROS VENTRE MOUNTAINS THIS AFTERNOON THROUGH WEDNESDAY MORNING... ...HIGH WIND WARNING IN EFFECT FOR THE ABSAROKA AND EASTERN WIND RIVER MOUNTAINS THIS AFTERNOON THROUGH 8 PM THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SNOW...HEAVY AT TIMES...IS EXPECTED TO DEVELOP OVER PARTS OF YELLOWSTONE...AS WELL AS TETON AND GROS VENTRE MOUNTAINS THIS AFTERNOON. THE SNOW IS EXPECTED TO EXPAND SOUTHWARD ACROSS WESTERN WYOMING LATE THIS AFTERNOON INTO THE EVENING WITH RAIN AND...OR SNOW IN THE VALLEYS CHANGING TO ALL SNOW BY SUNSET. SIGNIFICANT SNOWFALL IS POSSIBLE ACROSS THE SALT RIVER...WYOMING AND WESTERN SLOPES OF THE WIND RIVER MOUNTAINS. THE SNOW OVER THE WEST IS EXPECTED TO TAPER OFF WEDNESDAY MORNING. VERY STRONG WESTERLY WINDS ARE EXPECTED TO DEVELOP THIS AFTERNOON ACROSS THE EASTERN SLOPES OF THE ABSAROKAS AND WIND RIVER MOUNTAINS. WIND SPEEDS ARE EXPECTED TO REACH AROUND 50 MPH AT TIMES WITH GUSTS NEAR 75 MPH. THE VERY STRONG WINDS ARE EXPECTED TO WEAKEN BY ABOUT 8 PM. STRONG WINDS ARE EXPECTED ACROSS SOUTHEAST FREMONT COUNTY...AS WELL AS THE LOWER ELEVATIONS OF NATRONA COUNTY THIS AFTERNOON AND EARLY EVENING AT SPEEDS OF 25 TO 35 MPH WITH GUSTS OF 45 TO 55 MPH. PLEASE SEE THE LATEST STATEMENTS ON THIS WINTER WEATHER AND HIGH WIND EVENT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY SIGNIFICANT SNOWFALL COULD ONCE AGAIN OCCUR ACROSS PARTS OF WESTERN WYOMING SATURDAY AND SATURDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY SNOW AMOUNTS AND WIND GUST OVER 45 MPH. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 1050 AM MST TUE DEC 14 2010 WYZ019-020-142300- GREEN MOUNTAINS AND RATTLESNAKE RANGE- NATRONA COUNTY LOWER ELEVATIONS- 1050 AM MST TUE DEC 14 2010 SOUTHWEST WINDS WILL INCREASE FROM JEFFERY CITY AND THE SURROUNDING GREEN MOUNTAINS AND RATTLESNAKE RANGE TO CASPER THIS AFTERNOON. WIND SPEEDS OF 25 TO 35 MPH WITH GUSTS OF 45 TO 55 MPH WILL BE COMMON ALONG HIGHWAY 287 THROUGH JEFFERY CITY AS WELL ALONG WYOMING BOULEVARD JUST SOUTH OF CASPER. THE STRONGEST WINDS ARE EXPECTED TO OCCUR FROM 3 PM THIS AFTERNOON THROUGH 8 PM THIS EVENING. IF DRIVING THROUGH THESE AREAS DURING THIS TIME FRAME ANTICIPATE POTENTIALLY DANGEROUS CROSS WINDS...ESPECIALLY IF DRIVING A HIGH PROFILE VEHICLE. LIPSON
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 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: 265166.