A lone thunderstorm produced a tornado over extreme southeast Fremont County.
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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.
A lone thunderstorm produced a tornado over extreme southeast Fremont County.
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 3, 3:10 AM MST, 9 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 410 AM MDT WED JUN 3 2009 .SHORT TERM...TODAY THROUGH FRIDAY NIGHT TOPS ARE WARMING ACROSS WESTERN WYOMING. FOG PRODUCT AND AREA OBS INDICATING LOW STRATUS DECK HANGING ON EAST OF THE DIVIDE. LOW CLOUDS WILL DISSIPATE BY MID MORNING AS DECREASING HIGH AND MID CLOUDS ALLOW FOR MORE SOLAR INSULATION TO EVAPORATE THE STRATUS AS A TRANSITORY RIDGE BUILDS INTO THE AREA SANDWICHED BETWEEN THE NORTHERN STREAM JET AND CLOSED LOW OFF THE CALIFORNIA COAST. WITH LOW LEVEL MOISTURE IN PLACE FROM ABUNDANT PRECIP THAT FELL DURING THE LAST 24 HOURS AND LIFTED INDICES OF -2 TO -3...SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS THE CWA WITH THE EXCEPTIONS OF THE BIG HORN BASIN...THE BIG HORN MTNS AND JOHNSON COUNTY WHERE JUST SCATTERED SHOWERS ARE EXPECTED WHERE THE MORE STABLE AIRMASS WILL BE LINGERING. BY THURSDAY THE SOUTH SOUTHWEST FLOW AHEAD OF THE APPROACHING CLOSED LOW OFF THE CA COAST WILL BECOME INCREASINGLY DIFFLUENT. THIS WILL RESULT IN AN INCREASING CHANCE OF THUNDERSTORMS...ESPECIALLY OVER NW WY. SOUTHEAST NATRONA COUNTY IS UNDER A SLIGHT RISK FOR THURSDAY. BY FRIDAY...THE CLOSED LOW THAT HAD BEEN EJECTING THE SHORTWAVES NORTHEAST TO WYOMING THIS WEEK...NOW OFFSHORE FROM CALIFORNIA... WILL FINALLY TRACK TO WYOMING AS AN OPEN WAVE BY SATURDAY. THIS WEATHER SYSTEM WILL DRIVE ANOTHER STRONG COLD FRONT SOUTH ACROSS WYOMING...ESPECIALLY EAST OF THE DIVIDE ACROSS NORTHERN WY FRIDAY NIGHT. THE INCREASED DIFFLUENT FLOW AND THE INCREASING FRONTAL SURFACE CONVERGENCE WILL RESULT IN LIKELY POPS ACROSS THE NORTHERN TWO THIRDS OF WYOMING FRIDAY AND FRIDAY NIGHT. ONCE AGAIN...SOUTHEAST NATRONA COUNTY WILL BE UNDER A SLIGHT RISK FRIDAY. COLD AIR BEHIND THE FRONT WILL CAUSE 700MB TEMPS TO DROP TO -8C OVER NORTHERN WY FRIDAY NIGHT. AS A RESULT...UP TO A HALF A FOOT OF WET SNOWFALL COULD OCCUR ACROSS THE ABSAROKA MTNS AS WELL AS OVER THE HIGHER BIG HORN AND UPPER EAST SLOPE OF THE WIND RIVER MOUNTAINS. THE NORTHERN BIG HORN BASIN MAY EVEN SEE SOME SNOWFLAKES FRIDAY NIGHT. NAM IS FORECASTING AT LEAST THREE QUARTERS OF AN INCH OF RAIN ACROSS THE BIG HORNS DURING FRIDAY AND FRIDAY NIGHT. THE APPROACHING 700MB LOW OVER MT AS WELL AS THE LEFT FRONT QUAD OF THE 90 KNOT JET WILL ALSO HELP ENHANCE PRECIP FRIDAY AND FRIDAY NIGHT OVER THIRDS OF WY. TEMPERATURES WILL WARM TODAY ONLY TO COOL OFF AGAIN FRIDAY NIGHT. .LONG TERM...SATURDAY THROUGH WEDNESDAY ACTIVE PERIOD TO CONTINUE THROUGH THE MEDIUM RANGE AS INTERACTION WITH MOISTURE FROM THE SOUTHWEST AND COLD FRONTS FROM THE NORTH CONTINUE THROUGH THE MIDDLE OF NEXT WEEK. THE FIRST SYSTEM ON SATURDAY IS SHOWING SOME SIGNIFICANT TIMING DIFFERENCES BETWEEN THE GFS AND EURO. THE GFS IS FASTER WITH THE REMNANTS OF THE SW LOW MOVING ACROSS THE SERN HALF OF THE AREA DURING THE DAY SATURDAY. THE ECMWF IS ABOUT 24 HOURS LATER. BOTH MODELS STILL HAVE A STRONG NRN SHORTWAVE DROPPING SOUTH THROUGH MONTANA PUSHING A COLD FRONT INTO THE NRN ZONES DURING THE DAY SATURDAY AND POSSIBLY IN THE CENTRAL ZONES BY LATE IN THE DAY. THE GFS IS SHARPLY COLDER ON SATURDAY WHILE THE EURO TAKES UNTIL LATER SATURDAY NIGHT BEFORE THE COLDER AIR ARRIVES. HAVE DROPPED HIGH TEMPS ON SATURDAY 5 TO 10 DEGREES BUT THEYRE STILL A GOOD 10 DEGREES BELOW WHAT THE MEX GUIDANCE IS FORECASTING. IN FACT...THE FORECAST TEMPS ARE SIMILAR TO YESTERDAYS HIGHS. CANT GO THAT LOW YET BUT THE NEXT SHIFT WILL NEED TO LOOK AT THIS AGAIN. FORECAST IS A COMPROMISE BETWEEN THE EURO AND GFS WITH THE HIGHEST POPS IN THE NORTH. SATURDAY NIGHT INTO SUNDAY THE STRONG NRN WAVE SWINGS ACROSS WITH PLENTY OF FORCING AND UPSLOPE TO LIKELY PRODUCE WIDESPREAD PCPN ACROSS MUCH OF THE AREA. PCPN CHANCES DECREASE SUNDAY NIGHT INTO MONDAY MORNING BEHIND THE SHORTWAVE. MODELS DIVERGE AGAIN WITH THE NEXT SYSTEM WITH THE GFS BRINGING ANOTHER SHORTWAVE IN FROM THE WEST WHILE THE EURO SHOWS MORE OF A NW FLOW INFLUENCE. FORECAST SHOWS A GENERAL INCREASE IN PCPN CHANCES AGAIN MONDAY NIGHT AND TUESDAY...ESPECIALLY THE WEST AND NORTH. MOIST WEST TO SW FLOW PREVAILS ON WEDNESDAY WITH FRONTAL BOUNDARY STILL HANGING IN EAST OF THE DIVIDE. HITTING THE WEST AND NORTH WITH CHANCE FOR NOW AND AT LEAST 20 POPS ELSEWHERE. ACTIVE PATTERN CONTINUES THROUGH THIS PERIOD WITH MOST AREAS RECEIVING AT LEAST LIGHT TO MODERATE PCPN TOTALS AND LIKELY SOME HEAVY AMOUNTS AGAIN. && .AVIATION... VFR TO MVFR CONDITIONS WILL OCCUR THIS MORNING OVER THE REGION. SCATTERED LIGHT RAIN WILL OCCUR OVER THE NORTH BEFORE ENDING BY 18Z. DURING THE AFTERNOON...SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND WEST OF THE CONTINENTAL DIVIDE AND THEN MOVE EAST ACROSS CENTRAL AND EAST CENTRAL WY AFTER 21Z THROUGH 03Z THURSDAY. LOCAL MVFR CONDITIONS MAY OCCUR WITH THE STORMS ALONG WITH MOUNTAIN OBSCURATION. && .FIRE WEATHER... LOW CLOUDS WILL CLEAR OFF EAST OF THE CONTINENTAL DIVIDE BY MID MORNING. A ROUND OF MAINLY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS WESTERN AND CENTRAL WYOMING TODAY WITH JUST SCATTERED SHOWERS EXPECTED FROM THE BIG HORN BASIN TO JOHNSON COUNTY WHERE THE AIRMASS WILL BE MORE STABLE. TEMPERATURES WILL BE MILDER TODAY. A BETTER CHANCE OF MAINLY LATE THUNDERSTORMS ARE EXPECTED THURSDAY. THEN THE CLOSED LOW PRESSURE CENTER OFF THE CALIFORNIA COAST WILL EJECT TOWARD WY FRIDAY RESULTING IN A LIKELIHOOD OF PRECIP ACROSS THE NORTHERN TWO THIRDS OF WYOMING FRIDAY AND FRIDAY NIGHT. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...LIPSON LONG TERM...SKRBAC AVIATION...AR FIRE WEATHER...LIPSON
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE RIVERTON WY 521 AM MDT WED JUN 3 2009 WYZ001>020-022>030-041100- 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- 521 AM MDT WED JUN 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT MORE SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS WESTERN...SOUTHERN AND CENTRAL WYOMING...MAINLY THIS AFTERNOON AND EVENING. SOME OF THESE STORMS WILL HAVE SMALL HAIL AND LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY ADDITIONAL SHOWERS AND THUNDERSTORMS ARE EXPECTED THURSDAY AFTERNOON AND EVENING ALONG WITH SMALL HAIL AND LOCALLY HEAVY RAINFALL. SOME OF THE STORMS IN EASTERN NATRONA COUNTY MAY HAVE PEA TO DIME SIZE HAIL...HEAVY RAINFALL...FREQUENT LIGHTNING AND WIND GUSTS OF 50 MPH. ON FRIDAY...SHOWERS WILL BECOME MORE NUMEROUS ALONG WITH ISOLATED THUNDERSTORMS. ONCE AGAIN...SOME OF THE STORMS IN EASTERN NATRONA COUNTY MAY HAVE PEA TO DIME SIZE HAIL...HEAVY RAINFALL...FREQUENT LIGHTNING AND WIND GUSTS OF 50 MPH. ON FRIDAY NIGHT RAINFALL OVER THE MOUNTAINS WILL TURN TO SNOW WITH UP TO ONE HALF OF A FOOT OF WET SNOW EXPECTED ABOVE 8500 FEET WHICH MAY AFFECT TRAVEL OVER GRANITE AND POWDER RIVER PASSES IN THE BIG HORN MOUNTAINS AS WELL AS TOGWOTEE PASS AND THE CHIEF JOSEPH HIGHWAY. ADDITIONAL WIDESPREAD SIGNIFICANT PRECIPITATION IS PROBABLE FRIDAY AND FRIDAY NIGHT OVER THE NORTHERN TWO OF WYOMING SO RIVER LEVELS WILL ONCE AGAIN NEED TO BE WATCHED. ANOTHER STORM SYSTEM WILL MOVE IN OVER THE WEEKEND WITH WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS EXPECTED FOR MUCH OF THE AREA ALONG WITH MUCH COOLER WEATHER. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO REPORT WIND GUSTS OVER 40 MPH...ANY HAIL AND HEAVY RAINFALL. SPOTTERS ARE ALSO ENCOURAGED TO REPORT ANY POSSIBLE BANKFULL STREAMS OR RIVERS. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 122 PM MDT WED JUN 3 2009 WYZ030-032000- EAST SWEETWATER COUNTY- 122 PM MDT WED JUN 3 2009 ...SIGNIFICANT WEATHER ADVISORY FOR SWEETWATER COUNTY UNTIL 200 PM MDT... AT 121 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 6 MILES EAST OF STATE HWY 430 MILE MARKER 50...OR 47 MILES SOUTHEAST OF ROCK SPRINGS...MOVING EAST AT 20 MPH. HALF INCH HAIL...AND WINDS AROUND 55 MPH ARE POSSIBLE WITH THIS STORM. DANGEROUS CLOUD-TO-GROUND LIGHTNING IS POSSIBLE WITH THIS STORM. RESIDENTS IN SOUTHERN SWEETWATER COUNTY...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 139 PM MDT WED JUN 3 2009 WYZ019-032030- GREEN MOUNTAINS AND RATTLESNAKE RANGE- 139 PM MDT WED JUN 3 2009 ...SIGNIFICANT WEATHER ADVISORY FOR FREMONT AND SWEETWATER COUNTIES UNTIL 230 PM MDT... AT 139 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THUNDERSTORMS WERE RAPIDLY DEVELOPING 7 MILES SOUTHWEST OF CROOKS GAP...OR 13 MILES SOUTHWEST OF JEFFREY CITY...MOVING EAST AT 15 MPH. HALF INCH HAIL...AND WINDS AROUND 50 MPH ARE POSSIBLE WITH THESE STORMS. RESIDENTS IN NORTHEASTERN SWEETWATER AND SOUTHEASTERN FREMONT COUNTIES...INCLUDING THE LOCATION OF CROOKS GAP...SHOULD MONITOR THE WEATHER SITUATION CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. BRANHAM
The Riverton/Lander radar (KRIW), 94 km away, was scanning. The volume nearest the first event began at 19:45 UTC.
1 tornado. Local standard time, as filed.
A weak tornado was seen and photographed for about four minutes over open country in the Great Divide Basin. The tornado occurred in association with a thunderstorm moving east-southeast near the Fremont-Sweetwater County line.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2009Every state in 2009This day in weather historyThe tornado archive for Wyoming, 2009Warnings in Wyoming, June 2009
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: 163676.