A strong thunderstorm moved off the Wind River Range into Lander producing a 59 mph wind gust at Hunt Field.
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The episode as NWS RIW wrote it up.
A strong thunderstorm moved off the Wind River Range into Lander producing a 59 mph wind gust at Hunt Field.
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 Jun 28, 1:53 PM MST, 6 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 253 PM MDT TUE JUN 28 2011 SHORT TERM...TONIGHT THROUGH FRIDAY MOISTURE ALREADY CREEPING NORTHWARD THIS AFTERNOON ALLOWING FOR THE FIRST THUNDERSTORM TO DEVELOP OVER SOUTHWEST SWEETWATER COUNTY. EXPANDED MY ISOLATED THUNDERSTORM COVERAGE A LITTLE MORE TO COVER MUCH OF SWEETWATER AND SOUTHEAST LINCOLN COUNTY THROUGH THIS EVENING. MORE OF THIS MID LEVEL MOISTURE WILL START SPREADING NORTH LATER TONIGHT INTO WEDNESDAY WITH AN INCREASING THREAT OF HIGH BASED STRONG WIND STORMS ON WEDNESDAY. THE POTENTIAL FOR DAMAGING WINDS WILL BE THE MAIN THREAT WITH THESE STORMS... ESPECIALLY WHEN COMBINED WITH THE OVERALL AMBIENT SOUTHWEST FLOW OF 20 TO 30 KNOTS. HAVE ADDED MORNING CONVECTION DOWN SOUTH AND INCREASED THE COVERAGE WEDNESDAY INTO THURSDAY MORNING ACROSS MUCH OF THE AREA. POTENTIAL FOR A FEW STRONGER STORMS IS STILL THERE LATE WEDNESDAY NIGHT AND THURSDAY MORNING AS THE WEST COAST LOW OPENS UP AND RACES ACROSS THE AREA FROM SW TO NE. WINDS WILL BE ON THE INCREASE INTO WEDNESDAY WITH A MILD AND WINDY NIGHT TONGIHT IN THE HIGH COUNTRY FOR CONTINUED SNOWMELT. NORTH WINDS WILL DEVELOP BEHIND THIS SYSTEM ACROSS THE NORTH WHICH MAY BE A FOCUS FOR CONTINUED SHOWERS AND ISOLATED THUNDERSTORMS INTO THURSDAY AFTERNOON ACROSS OUR NORTH. SYSTEM PULLS AWAY THURSDAY NIGHT WITH A FLATTER...DRIER FLOW ON FRIDAY. TEMPERATURES WILL LIKELY COOL 10 TO 15 DEGREES ON THURSDAY WITH LITTLE CHANGE FRIDAY IN MOST AREAS... EXCEPT WARMER SOUTH AND A LITTLE WEST. LONG TERM...FRIDAY NIGHT THROUGH TUESDAY ZONAL FLOW WILL AFFECT THE AREA FRIDAY AND SATURDAY...KEEPING TEMPERATURES SLIGHTLY BELOW NORMAL. THE MODELS ARE IMPLYING SOME VERY WEAK SHORTWAVE ENERGY WILL MOVE THROUGH FRIDAY AND SATURDAY AFTERNOONS...GIVING RISE TO VERY LOW CHANCES OF SHOWERS AND THUNDERSTORMS MAINLY IN NORTHEASTERN WYOMING. WARMING WILL BRING TEMPERATURES BACK TO NEAR NORMAL SUNDAY AND MONDAY AS HIGH PRESSURE BUILDS INTO THE GREAT BASIN AND CENTRAL ROCKIES. BOTH THE GFS AND ECMWF KEEP A BIT OF A 700MB TEMPERATURE NORTH-SOUTH ORIENTED GRADIENT OVER THE STATE THOUGH WITH ZONAL FLOW THROUGH THE NORTHERN ROCKIES. THE LATEST 00Z ECMWF IS MORE IN LINE WITH THE 00Z GFS WITH SLIGHTLY HIGHER 500MB HEIGHTS OVER THE AREA MONDAY AND TUESDAY. THE PREVIOUS ECMWF RUNS WERE KEEPING MORE ENERGY MOVING THROUGH THE SOUTHERN CANADIAN ROCKIES. WITH THE HIGH BUILDING IN TO OUR SOUTH...MOISTURE AND INSTABILITY ARE LIKELY TO BE ENHANCED OVER WYOMING...INCREASING CLOUDINESS AND CHANCES OF SHOWERS AND THUNDERSTORMS FOR FOURTH OF JULY ACTIVITIES. THE 00Z ECMWF IS HINTING AT A SHORTWAVE TROUGH TO MOVE OVER THE RIDGE FROM THE PACIFIC NORTHWEST AND ENHANCE CONVECTION TUESDAY AFTERNOON AND EVENING. WINDS APPEAR TO REMAIN RELATIVELY LIGHT DURING THE EXTENDED PERIOD...WITH SOME EASTERLY FLOW EAST OF THE DIVIDE AT TIMES. AVIATION... VFR CONDITIONS EXPECTED AT LOCAL AIRPORTS THROUGH 12Z WEDNESDAY. A FEW SHOWERS MAY DEVELOP OVER THE NORTHERN MOUNTAINS AND EXTREME SOUTHERN SWEETWATER COUNTY THROUGH 06Z THIS EVENING. THE NORTHERN STORMS MAY RESULT IN SOME MOUNTAIN TOP OBSCURATIONS. GUSTY WIND WILL BE FOUND ACROSS MUCH OF THE AREA THROUGH THE FORECAST PERIOD...ESPECIALLY THROUGH 06Z TONIGHT AND AFTER 18Z WEDNESDAY. AN APPROACHING AREA OF LOW PRESSURE WILL INTRODUCE ISOLATED SHOWERS AND THUNDERSTORMS ACROSS WESTERN AND CENTRAL WYOMING AFTER 18Z WEDNESDAY. GUSTY AND ERRATIC WIND MAY ACCOMPANY ANY STORM ACTIVITY AT LOCAL AIRPORTS. IN ADDITION TO WIND...THESE STORMS MAY BRING PERIODS OF MVFR CONDITIONS TO IMPACTED AIRPORTS. HYDROLOGY... IT WILL CONTINUE VERY WARM TO HOT THROUGH WEDNESDAY ALONG WITH INCREASING WIND. TONIGHT WILL BE MILD AND WINDY EVEN IN THE MOUNTAINS TO ALLOW SNOWMELT TO CONTINUE. SCATTERED HIGH BASED THUNDERSTORMS WITH STRONG WINDS WILL DEVELOP ON WEDNESDAY ACROSS THE SOUTH AND SPREAD NORTHWARD ACROSS THE AREA. A FEW WETTER AND STRONGER THUNDERSTORMS ARE POSSIBLE LATER WEDNESDAY NIGHT AND THURSDAY MORNING BUT THE STORMS SHOULD BE MOVING FAIRLY QUICKLY. TEMPERATURES WILL COOL 10 TO 15 DEGREES ON THURSDAY WITH SHOWERS RETREATING TO THE FAR NORTH. FRIDAY WILL BE DRY AND SEASONABLE. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...SKRBAC LONG TERM...MCDONALD AVIATION...BRANHAM HYDROLOGY...SKRBAC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 509 AM MDT TUE JUN 28 2011 WYZ001>020-022>030-291100- 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- 509 AM MDT TUE JUN 28 2011 ...FLOOD WARNING FOR THE WIND RIVER FROM DUBOIS TO RIVERTON AND FOR SMALLER CREEKS AND RIVERS OF BIG HORN COUNTY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT EXCESSIVE SNOWMELT DUE TO WARM TEMPERATURES WILL CAUSE RISING WATER LEVELS ON THE WIND RIVER FROM FROM DUBOIS THROUGH RIVERTON. FLOODING IS LIKELY IN LOW LYING AREAS ADJACENT TO THE WIND RIVER. OTHER FLOODING IS POSSIBLE ON SMALLER CREEKS AND RIVERS OF SOUTHEAST BIG HORN COUNTY AROUND MANDERSON...HYATTVILLE...AND SHELL. A FLOOD WATCH HAS BEEN ISSUED FOR THE GREEN RIVER NEAR LABARGE AND THE BLACKS FORK NEAR GRANGER DUE TO SNOWMELT. WATER WILL CONTINUE TO RUN HIGH IN THESE LOCATIONS TODAY AND TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS WILL OCCUR WEDNESDAY. THEN A BETTER CHANCE OF STORMS WEDNESDAY NIGHT AND THURSDAY AS A WEATHER SYSTEM MOVES THROUGH THE AREA. SOME OF THE STORMS COULD HAVE STRONG WIND GUSTS AND HAIL. CREEKS AND RIVERS WILL CONTINUE TO RUN HIGH AND SWIFT AS THE HIGH MOUNTAIN SNOWPACK CONTINUES TO MELT THIS WEEK. THE WIND RIVER... SHOSHONE RIVER...GREEN RIVER...BLACKS FORK...AND BIG HORN RIVER BASINS WILL BE MOST SUSCEPTIBLE TO THE HIGH RUNOFF. EXERCISE CAUTION NEAR FAST FLOWING RIVERS AS THE CURRENT WILL BE DANGEROUS AND DEBRIS WILL BE FLOWING IN THE CHANNEL AS WELL. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT FLOODING TO THE NATIONAL WEATHER SERVICE AT 1-800-211-1448. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 646 PM MDT TUE JUN 28 2011 WYZ014-015-290300- WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- 646 PM MDT TUE JUN 28 2011 SCATTERED SHOWERS AND THUNDERSTORMS WILL IMPACT THE WIND RIVER MOUNTAINS THIS EVENING. LIGHTNING AND VERY GUSTY OUTFLOWS TO 55 MPH CAN BE EXPECTED. THOSE TRAVELLING HIGHWAY 28 OVER SOUTH PASS SHOULD BE PREPARED FOR SUDDEN...ERRATIC STRONG GUSTS. TWB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 702 PM MDT TUE JUN 28 2011 WYZ018-290300- LANDER FOOTHILLS- 702 PM MDT TUE JUN 28 2011 SHOWERS AND THUNDERSTORMS OVER THE WIND RIVER MOUNTAINS THIS EVENING COULD BRING VERY GUSTY OUTFLOW WINDS TO THE LANDER AND FORT WASHAKIE AREAS. OUTFLOWS TO 55 MPH ARE POSSIBLE IN THESE AREAS. RESIDENTS AND MOTORISTS SHOULD BE PREPARED FOR SUDDEN... ERRATIC STRONG GUSTS. TWB
The Riverton/Lander radar (KRIW), 34 km away, was scanning. The volume nearest the first event began at 03:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm produced a 59 mph outflow wind gust at Lander Hunt Field.
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, June 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: 314358.