An increasing pressure gradient ahead of a southward-moving Arctic cold front was aided by strong upper level wind to produce high wind in areas around Clark. There were many gusts over 60 mph on Sunday afternoon, November 9.
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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 RIW wrote it up.
An increasing pressure gradient ahead of a southward-moving Arctic cold front was aided by strong upper level wind to produce high wind in areas around Clark. There were many gusts over 60 mph on Sunday afternoon, November 9. The strongest gust was 84 mph approximately five miles west-northwest of Clark at 1425MST.
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 9, 12:02 PM MST, 1 hour 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 1202 PM MST SUN NOV 9 2014 .SHORT TERM...SUNDAY THROUGH TUESDAY NIGHT ISSUED WINTER WEATHER ADVISORY FOR THE WESTERN MOUNTAINS 11 PM TONIGHT TO NOON. REARRANGED ADVISORIES IN THE NORTH TO ALL START AT 11 PM WHILE THOSE TO THE SOUTH STARTING AT 5 AM. TODAY WILL BE LAST MILD DAY FOR A WHILE AND PROBABLY THE WARMEST DAY UNTIL NEXT MARCH OR APRIL. THE WELL PUBLICIZED ARCTIC FRONT WILL BEGIN DROPPING SOUTHWARD THROUGH MONTANA TODAY. WITH HIGH PRESSURE TO THE SOUTH THIS WILL TIGHTEN UP THE PRESSURE GRADIENT AND BRING GUSTY WINDS TO MUCH OF THE AREA. WE WILL CONTINUE THE HIGH WIND WARNING FOR THE CLARK FOOTHILLS. IT MAY EVEN NEED TO BE EXTENDED BUT WE WILL LEAVE IT AS IS FOR NOW. WE ARE ON THE FENCE AS WELL ACROSS OTHER AREAS. THE MODELS SHOW 700 MILLIBAR WINDS STRENGTHENING TO 55 TO AS MUCH AS 65 KNOTS ACROSS PORTIONS OF THE AREA THIS EVENING. HOWEVER...THERE IS A DECENT AMOUNT OF SPEED SHEAR AND WITH THESE OCCURRING AFTER SUNSET THERE MAY NOT BE ENOUGH MIXING. SO AS OF NOW WE WILL NOT EXPAND THE HIGH WIND WARNING...BUT IT WILL HAVE TO BE WATCHED BY THE DAY SHIFT. IT WILL BE A WARM DAY TODAY. THE GFS IS ESPECIALLY WARM WITH MAXIMUM TEMPERATURES INTO THE 70S FOR RIVERTON AND LANDER. WE DID NOT GO THAT WARM BUT HIGH SHOULD BE WELL INTO THE 60S. AS FOR PRECIPITATION...ALL THE MODELS KEEP THINGS DRY SO WE REMOVED THE POPS FROM SUNDAY MORNING AND CONFINED MAINLY ISOLATED ACTIVITY TO THE MOUNTAINS FOR THIS AFTERNOON. AFTER THAT...WE TURN THE LIGHTS OUT ON FALL AND OPEN THE CURTAIN TO WINTER. WE WILL COVER THIS IN TWO PARTS...THE SNOW AND THEN THE COLD. FIRST FOR THE SNOW. THE ARCTIC FRONT WILL BEGIN WORKING INTO THE STATE LATER THIS EVENING AND PRESS SOUTH THROUGH THE NIGHT AND TOMORROW MORNING. THERE ARE STILL SOME MODEL DIFFERENCES WITH THE PASSAGE WITH THE GFS THE SLOWEST WHILE THEN NAM AND EUROPEAN ARE BOTH A BIT FASTER. FOR THE FORECAST...WE BLENDED THE NAM AND GFS ALONG WITH CONTINUITY. BY MORNING...THE PRECIPITATION WILL LIKELY BE CLOSE TO A RIVERTON TO CASPER LINE. THE HEAVIEST PRECIPITATION STILL LOOKS TO BE DURING THE MORNING AND EARLY AFTERNOON HOURS OF MONDAY WHEN THE DEEPEST MOISTURE INTERACTS WITH BEST LEFT FRONT QUAD OF AN 100+ KNOT JET STREAK. THE MODELS DO DIFFER WITH AMOUNTS WITH THE GFS THE DRIEST AND THE NAM AND EUROPEAN THE WETTEST. THE MODELS MAY HAVE TOO MUCH QPF WITH THE VERY DRY AIR MASS. HOWEVER...WE DID UP SNOWFALL AMOUNTS A BIT IN MANY AREAS. BECAUSE OF THIS...AND THE FACT IT WILL FALL DURING THE MORNING RUSH HOUR AND THE POTENTIAL OF A FLASH FREEZE ON THE ROADS...WE WILL EXPAND THE WINTER WEATHER ADVISORY TO ALL THE AREAS THAT STILL HAVE THE SPS IN EFFECT. WE WERE ALSO THINKING ABOUT ONE FOR PORTIONS OF THE WESTERN MOUNTAINS. HOWEVER...WITH THE HIGHER CRITERIA WE WILL ALLOW THE DAY SHIFT TO MAKE THE CALL. THE HEAVIEST SNOW SHOULD END IN THE EARLY AFTERNOON WITH THE BEST LIFT MOVING AWAY. HOWEVER...UPSLOPE FLOW WILL KEEP LIGHT SNOW GOING THROUGH THE DAY. MODELS ALSO INDICATE ANOTHER LOBE OF ENERGY ROTATING AROUND THE UPPER LEVEL LOW FOR MONDAY NIGHT AND TUESDAY. AGAIN...WITH THE ORIGIN OF THE LOW AND VERY COLD ATMOSPHERE THE QPF AMOUNTS ARE PROBABLY OVERDONE WITH THE LACK OF MOISTURE. HOWEVER...LIGHT SNOW LOOKS LIKE A FAIRLY GOOD BET. AT THIS POINT...IT LOOKS LIKE A SITUATION WITH AROUND AN INCH OF FLUFFY SNOW IN MOST AREAS EVERY 12 HOURS OR SO. SNOW SHOULD FINALLY END LATER TUESDAY NIGHT AS THE ENERGY MOVES AWAY TO THE SOUTH AND EAST. NOW FOR THE SECOND PART AND PROBABLY THE BIGGER STORY...THE BITTER COLD. TEMPERATURES MAY STAY FAIRLY MILD THROUGH SUNDAY NIGHT. HOWEVER...AFTER THE FRONTAL PASSAGE...TEMPERATURES WILL FALL THROUGH THE DAY ON MONDAY AS STRONG COLD ADVECTION FROM AIR THAT ORIGINATED OVER THE ARCTIC FLOODS INTO THE COUNTY WARNING AREA. SOME AREAS IN JOHNSON COUNTY COULD END UP IN THE SINGLE DIGITS AS EARLY AS MONDAY EVENING. BY FIRST THING TUESDAY MORNING...ALMOST ALL AREAS EAST OF THE DIVIDE SHOULD BE IN THE SINGLE DIGITS. WEST OF THE DIVIDE...THE MOUNTAINS SHOULD PREVENT THE COLDEST AIR FROM DRAINING IN BUT IT WILL BE CHILLY AS WELL. SOME OF THE CHANGE IN TEMPERATURES OVER 36 HOURS ARE VERY IMPRESSIVE. THE MOST TELLING IS ON THE GFS MOS...THE MOST I COULD FIND WAS LANDER WHICH GOES FROM A HIGH OF 74 ON SUNDAY AFTERNOON TO A LOW OF 7 ON TUESDAY MORNING...A CHANGE OF 67 DEGREES IN 36 HOURS! IT MAY NOT BE THAT MUCH...BUT SOME AREAS COULD BE LOOKING AT CHANGES OF 60+ DEGREES OVER THAT TIME FRAME. TEMPERATURES SHOULD NOT RECOVER MUCH ON TUESDAY AS WELL. THE BIG QUESTION IS WHAT WILL HAPPEN FOR WEDNESDAY MORNING. THE NEW GFS MOS IS VERY COLD...WITH CASPER TAKING THE TOP PRIZE WITH A LOW OF -21. THE X FACTOR WILL BE SKY COVER. RIGHT NOW...I HAVE A HARD TIME BELIEVING THAT IT WILL GET THAT COLD IF IT STAYS CLOUDY. NEVERTHELESS...IT WILL BE A BRUTALLY COLD NIGHT WITH LOW TEMPERATURES BELOW ZERO ACROSS MUCH OF THE AREA. SO...TIME TO PUT AWAY THE GOLF CLUBS AND BREAK OUT THE HOCKEY STICKS AND SNOWBOARDS. .LONG TERM...WEDNESDAY THROUGH SUNDAY THE LONG RANGE MODELS HAVE VERY COLD 700MB TEMPS OVER THE REGION ON WEDNESDAY. EVEN AREAS WEST OF THE DIVIDE LOOK TO GET SOME OF THE COLD AIR AND HAD TO ADJUST SOME HIGHS IN THE WEST AND SOUTHWEST. WEDNESDAY DOES LOOK DRY NOW WITH SOME SUNSHINE TO TRY AND OFFSET THE COLD AIR. DRY AND VERY COLD WEDNESDAY NIGHT WITH MOST AREAS EAST OF THE DIVIDE BELOW ZERO FOR LOWS. SOME CLOUDS MAY DEVELOP OVER THE FAR WEST AND SOUTHWEST WHICH MAY HELP STEADY OUT THE TEMPS LATE WED NIGHT. THE MODELS CONTINUE TO SHOW AN INCREASE IN MOISTURE THURSDAY THROUGH FRIDAY NIGHT AS A NW FLOW ALOFT IS FED WITH PACIFIC MOISTURE. LIGHT SNOW SHOULD DEVELOP OVER THE WEST AND SOUTHWEST BY MIDDAY THURSDAY AND CONTINUE OFF AND ON THROUGH FRIDAY MORNING. THIS PATTERN HAS THE POTENTIAL TO BRING DECENT SNOW TO A PORTION OF THE WESTERN MOUNTAINS AND SOUTH. WILL BE WATCHING THIS OVER THE UPCOMING DAYS. THE NORTH AND CENTRAL STAYS DRY FOR NOW BUT SOME SNOW COULD OCCUR IN THE CENTRAL ZONES IF THE MOISTURE IS DEEP ENOUGH AND NOT TAKEN BY THE WESTERN MOUNTAINS. SATURDAY WILL SEE LINGERING LIGHT SNOW WITH THE SNOW ENDING FROM NORTH TO SOUTH IN THE AFTERNOON. NEXT SUNDAY MAY SEE A FEW SNOW SHOWERS IN THE NORTHERN MOUNTAINS WITH DRY CONDITIONS ELSEWHERE. HIGH TEMPS WILL MODERATE THURSDAY AND FRIDAY. ANOTHER QUICK SHOT OF COLD AIR MAY OCCUR EAST OF THE DIVIDE ON SATURDAY MAKING HIGH TEMPS A LITTLE COLDER. MILDER NEXT SUNDAY. .AVIATION.../18Z ISSUANCE/ WEST OF THE DIVIDE KBPI/KJAC/KPNA/KRKS ROUTES BREEZY TO WINDY CONDITIONS...AREAS OF LLWS...WILL DEVELOP AHEAD OF AN APPROACHING COLD FRONT DURING THE LATE MORNING AND AFTERNOON SUNDAY. THE COLD FRONT WILL SPREAD RAIN AND SNOW WITH SNOW LEVELS INITIALLY 7.5-8.5KFT SOUTH TO A VCNTY KJAC-KPNA LINE BY 3Z MONDAY...ALONG WITH AREAS OF IFR CONDITIONS AND MTS BECOMING OBSCURED. SNOW LEVELS WILL LOWER TO VALLEY FLOORS AFTER 06Z MONDAY. -SHRA/-SHSN IS EXPECTED TO BE MORE SCT ALONG THE INTERSTATE 80 CORRIDOR 06Z-12Z MONDAY WHERE SFC WEST WIND AT 20-30KT WILL CONTINUE OUT AHEAD OF THE COLD FRONT. EAST OF THE DIVIDE...KCPR/KCOD/KLND/KRIW/KWRL ROUTES BREEZY TO WINDY CONDITIONS...W-SW SFC WINDS 15-30KT... AND AREAS OF LLWS WILL PRECEDE A COLD FRONT THAT WILL MOVE SOUTH ACROSS THE AREA 06Z-15Z MONDAY. THE STRONGER SFC WINDS WILL BE ACROSS THE SOUTHERN WIND CORRIDOR AND ALONG THE EASTERN FOOTHILLS DURING THE DAY SUNDAY WITH STRONGER WINDS MIXING DOWN TO THE SURFACE IN THE LOWER CENTRAL BASINS SUNDAY EVENING. VFR CONDITIONS WILL PREVAIL AHEAD OF THE COLD FRONT. CONDITIONS WILL RAPIDLY DETERIORATE BEHIND THE COLD FRONT 06Z-12Z MONDAY WITH WIDESPREAD IFR CONDITIONS IN SN BLSN...SFC NORTH WIND 20-30KT...EXPECTED VCNTY AND NORTH OF A KRIW-KCPR LINE BY 12Z MONDAY. .FIRE WEATHER... NORTHWEST FLOW ALOFT WILL CONTINUE TODAY WITH STRONG DOWNSLOPE WINDS ALONG THE EAST SLOPES OF THE MOUNTAINS WITH WARMING AND LOWERING RELATIVE HUMIDITY. VARIABLE MID AND HIGH CLOUDS WILL MOVE ACROSS THE AREA. TONIGHT AN ARCTIC COLD FRONT WILL MOVE INTO THE NORTH AND SPREAD RAPIDLY SOUTH WITH INCREASED SNOWFALL AND MUCH COLDER TEMPERATURES AS THE WIND SHIFTS TO THE NORTHEAST. COLD TEMPERATURES WILL CONTINUE FOR MOST OF THE WEEK. && .RIW WATCHES/WARNINGS/ADVISORIES... WINTER WEATHER ADVISORY FROM 5 AM MONDAY TO 5 AM MST TUESDAY WYZ005>007-011-016>020-022. WINTER WEATHER ADVISORY FROM 11 PM THIS EVENING TO NOON MST MONDAY WYZ001-012-024. WINTER WEATHER ADVISORY FROM 11 PM THIS EVENING TO 5 AM MST TUESDAY WYZ002>004-008>010-014-015. HIGH WIND WARNING UNTIL 5 PM MST THIS AFTERNOON WYZ002-003. && SHORT TERM...HATTINGS LONG TERM...AR AVIATION...C.BAKER FIRE WEATHER...HATTINGS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 400 AM MST SUN NOV 9 2014 WYZ001>020-022>030-101300- 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- 400 AM MST SUN NOV 9 2014 ...HIGH WIND WARNING IN EFFECT FOR ABSAROKAS AND CODY FOOTHILLS 11 PM SATURDAY UNTIL 5 PM SUNDAY... ...WINTER WEATHER ADVISORY IN EFFECT FOR THE ABSAROKA...WIND RIVER... AND BIGHORN MOUNTAINS SUNDAY NIGHT THROUGH TUESDAY MORNING... ...WINTER WEATHER ADVISORY IN EFFECT FOR THE REMAINDER OF THE AREA EAST OF THE DIVIDE MONDAY MORNING THROUGH TUESDAY MORNING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT HIGH WINDS LIKELY IN THE CODY FOOTHILLS LATE TONIGHT. WIND GUSTS OF 60 MPH ARE POSSIBLE. SEE HIGH WIND WARNING PRODUCT FOR DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SNOW IS LIKELY MONDAY FOR MUCH OF THE AREA. PLEASE SEE FORECASTS AND WINTER WEATHER PRODUCTS FOR DETAILS. LIGHT SNOW WILL CONTINUE INTO TUESDAY. BITTERLY COLD TEMPERATURES WILL OCCUR EAST OF THE DIVIDE FROM MONDAY NIGHT THROUGH THURSDAY MORNING. CHANCES FOR SNOWFALL WILL INCREASE ACROSS THE WESTERN MOUNTAINS AND IN THE SOUTHWEST ON THURSDAY AND FRIDAY. ANOTHER COLD FRONT MOVES THROUGH NORTHERN AND CENTRAL WYOMING ON SATURDAY BRINGING COLDER TEMPERATURES. SOME LIGHT SNOW MAY OCCUR EAST OF THE DIVIDE FRIDAY NIGHT INTO SATURDAY AS A RESULT OF THIS FRONT. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE URGED TO REPORT STRONG WIND GUSTS. THANK YOU. TEAM RIVERTON
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Several wind gusts of over 58 mph were recorded in the vicinity of Clark. The maximum wind gust was 84 mph reported 5 miles WNW of Clark.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2014Every state in 2014This day in weather historyWarnings in Wyoming, November 2014
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: 545216.