A landspout tornado was filmed by a motorist at milepost 102 in Campbell County looking west into Johnson County.
Every event with a place to put it. Tap one for its entry below.
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 landspout tornado was filmed by a motorist at milepost 102 in Campbell County looking west into Johnson 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 1, 2:38 PM MST, 2 hours 16 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 338 PM MDT TUE JUN 1 2010 .SHORT TERM...TONIGHT THROUGH FRIDAY WEAK SHORTWAVE MOVING INTO WESTERN WYOMING MID THIS AFTERNOON WITH SCATTERED TO NUMEROUS SHOWERS...AND ISOLATED THUNDERSTORMS AHEAD OF IT. THE ACTIVITY IS MAINLY OVER THE NORTH AND EASTERN PORTIONS OF THE CWA. HAD SOME REPORTS OF SOME VERY SMALL HAIL AROUND MEETEETSE EARLIER THIS AFTERNOON. OTHERWISE...SOME MODERATE TO HEAVY RAINFALL ASSOCIATED WITH THE STRONGER SHOWERS. WEAK FRONT MADE IT INTO NORTHERN AND CENTRAL AREAS EAST OF THE DIVIDE WITH A LIGHT NORTH WIND. LOW CLOUDS HUNG IN MOST OF THE DAY AROUND JOHNSON COUNTY WHERE THE COOLER TEMPERATURES OCCURRED. SHORTWAVE WILL MOVE THROUGH OVERNIGHT TONIGHT WITH A FAST ZONAL FLOW BUILDING IN FOR THE REMAINDER OF THE WEEK. EMBEDDED SHORTWAVES IN THE FLOW WILL MOVE THROUGH NEARLY EACH DAY WITH SOME ISENTROPIC LIFT BRINGING STEADIER RAIN AND HIGH ELEVATION SNOW OCCURRING OVER THE FAR WEST MOUNTAINS AND VALLEYS WITH EACH APPROACHING SHORTWAVE. AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS CAN BE EXPECTED OVER THE WEST AND NORTH EACH DAY AS WELL...MOST NUMEROUS THURSDAY AND FRIDAY. WITH WESTERLY FLOW WILL SEE INCREASED WINDS ACROSS MUCH OF THE AREA...MAINLY IN THE AFTERNOONS AND EARLY EVENINGS. TEMPERATURES WILL BE SEASONAL TO SLIGHTLY COOLER THAN NORMAL. .LONG TERM...FRIDAY NIGHT THROUGH TUESDAY MOIST ISENTROPIC UPGLIDE AHEAD OF PACIFIC SHORTWAVE SHOULD BRING WIDESPREAD SHOWERS TO THE WEST ON FRIDAY. THE SE HALF OF THE AREA WILL GENERALLY BE DRY AND WARM. COLD FRONT WILL LIKELY SAG SOUTH AS SHORTWAVE MOVES THROUGH ON SATURDAY BRINGING A CHANCE OF SHOWERS TO THE NRN ZONES. FAST WLY FLOW CONTINUES ON SUNDAY WITH A CHANCE OF SHOWERS IN THE WEST IN ANOTHER POTENTIAL MOIST ISENTROPIC UPGLIDE PATTERN. THE NEXT TROUGH APPROACHES MONDAY AND MOVES THROUGH ON TUESDAY PER THE GFS WITH THE ECMWF FASTER. FORECAST IS WEIGHTED TOWARDS THE GFS TONIGHT WITH SHOWER CHANCES INCREASING AGAIN MONDAY INTO TUESDAY ACROSS THE WEST AND NORTH. TIMING WILL LIKELY CHANGE SOME WITH TIME IN THIS FAST WLY FLOW BUT IT LOOKS LIKE A CONTINUED ACTIVE PERIOD MORE PRECIPITATION IN THE WEST AND NORTH. && .AVIATION... AN UPPER LEVEL DISTURBANCE TRACKING EAST ACROSS THE STATE TODAY WILL RESULT IN NUMEROUS SHOWERS ALONG WITH EMBEDDED ISOLATED THUNDERSTORMS MAINLY WEST OF THE DIVIDE THIS EVENING WHERE THE WESTERLY UPSLOPE COMPONENT WILL ENCOURAGE ENHANCED PRECIPITATION THERE. THE STRONGEST THUNDERSTORMS WILL LIKELY OCCUR IN NORTHWEST WYOMING INCLUDING YELLOWSTONE PARK WHERE A LONGER PERIOD OF SUNSHINE THERE HAS ALLOWED THE AIRMASS TO FURTHER DESTABILIZE. MEANWHILE...A BACKDOOR COLD FRONT WILL SLIP SOUTH ACROSS JOHNSON AND NORTHERN NATRONA COUNTIES AS WELL AS OVER THE BIG HORN MOUNTAINS THIS EVENING WHICH WILL ALSO ACT AS A FOCUS FOR ADDITIONAL SHOWER AND THUNDERSTORM DEVELOPMENT...MOST NUMEROUS OVER THE BIG HORN MOUNTAINS. LOW CIGS WILL BE COMMON BEHIND THE FRONT PRODUCING MVFR AND IFR CONDITIONS ACROSS NORTHERN NATRONA AND JOHNSON COUNTIES. SCATTERED SHOWERS AND A FEW THUNDERSTORMS WILL OCCUR ELSEWHERE EAST OF THE DIVIDE. PRECIPITATION WILL GRADUALLY TAPER OFF LATER TONIGHT STATEWIDE. THESE SHOWERS WILL PRODUCE MVFR CONDITIONS ALONG WITH ISOLATED IFR CONDITIONS. MOUNTAIN OBSCURATIONS ARE EXPECTED MAINLY OVER THE WESTERN MOUNTAINS AND BIG HORN MOUNTAINS. THE NEXT IN A SERIES OF UPPER LEVEL DISTURBANCES WILL BRING AN INCREASE OF SHOWER AND THUNDERSTORM ACTIVITY ESPECIALLY TO NORTHWEST WYOMING BY LATE WEDNESDAY. && .FIRE WEATHER... SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED THIS EVENING...ESPECIALLY OVER THE NORTH AND WEST. A FAST WESTERLY ZONAL FLOW WILL INCREASE WEDNESDAY THROUGH THE REMAINDER OF THE WEEK WITH STEADIER RAIN AND HIGH ELEVATION SNOW IN THE FAR WEST. ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED OVER THE NORTH AND WEST IN THE AFTERNOONS AND EVENINGS AS WELL. SOUTHWEST TO WEST WINDS WILL OCCUR MOST AREAS THROUGH THE WEEK. TEMPERATURES WILL BE SEASONAL. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...TWB LONG TERM...SKRBAC AVIATION...LIPSON FIRE WEATHER...TWB
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 429 PM MDT TUE JUN 1 2010 WYZ001>020-022>030-021200- 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- 429 PM MDT TUE JUN 1 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL OCCUR UNTIL SUNSET OVER THE REGION. SMALL HAIL...BRIEF HEAVY RAIN...AND DANGEROUS LIGHTNING WILL BE POSSIBLE WITH STORMS. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY STREAMS OR RIVERS RISING RAPIDLY OR NEAR BANKFULL THIS WEEK DUE TO HIGH ELEVATION SNOWMELT. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 1156 AM MDT TUE JUN 1 2010 WYZ012-013-012000- JACKSON HOLE-TETON AND GROS VENTRE MOUNTAINS- 1156 AM MDT TUE JUN 1 2010 ...SCATTERED SHOWERS AND A FEW THUNDERSTORMS ARE EXPECTED ACROSS PORTIONS OF NORTHWEST WYOMING THROUGH 2 PM... A NORTH TO SOUTH ORIENTED BAND OF SHOWERS WILL BE MOVING EAST FROM EASTERN IDAHO INTO NORTHWEST WYOMING THROUGH 2 PM THIS AFTERNOON. A FEW THUNDERSTORMS ARE ALSO EXPECTED TO DEVELOP WITHIN THIS BAND OF SHOWERS...MAINLY OVER THE TETONS...JACKSON VALLEY AND THE GROS VENTRE RANGE. ANY THUNDERSTORMS THAT DO FORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WINDS. LIPSON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 241 PM MDT TUE JUN 1 2010 WYZ020-012200- NATRONA COUNTY LOWER ELEVATIONS- 241 PM MDT TUE JUN 1 2010 AT 234 PM MDT...RADAR INDICATED A CLUSTER OF THUNDERSTORMS CURRENTLY OVER THE WALTMAN AREA...MOVING NORTHEAST AT AROUND 30 MPH. THESE STORMS ARE EXPECTED TO CROSS US HIGHWAY 20/26 BETWEEN WALTMAN AND POWDER RIVER THROUGH 315 PM MDT. THESE STORMS ARE CAPABLE OF PRODUCING BRIEF MODERATE TO HEAVY RAINFALL...BRIEF GUSTY WINDS... OCCASIONAL CLOUD TO GROUND LIGHTNING...AND POSSIBLY SOME SMALL HAIL. ADDITIONAL SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED TO PERSIST ACROSS NATRONA COUNTY THROUGH 400 PM MDT. McNEEL
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 423 PM MDT TUE JUN 1 2010 WYZ001-020000- YELLOWSTONE NATIONAL PARK- 423 PM MDT TUE JUN 1 2010 ...THUNDERSTORMS TO IMPACT YELLOWSTONE NATIONAL PARK... SHOWERS AND A FEW THUNDERSTORMS WILL MOVE EAST FROM EASTERN IDAHO INTO YELLOWSTONE NATIONAL PARK THROUGH 6 PM. SOME OF THESE STORMS WILL IMPACT OLD FAITHFUL...LAKE YELLOWSTONE AND OTHER TOURIST ATTRACTION LOCATIONS. THESE STORMS WILL BE CAPABLE OF CLOUD TO GROUND LIGHTNING...SMALL HAIL...AND BRIEF HEAVY RAIN. SEEK SAFE SHELTER INDOORS WHEN THUNDERSTORMS APPROACH. AR
The Riverton/Lander radar (KRIW), 233 km away, was scanning. The volume nearest the first event began at 23:53 UTC.
1 tornado. Local standard time, as filed.
A motorist on Interstate 90 at milepost 102 in Campbell County shot video of a landspout tornado estimated to be five miles west in far eastern Johnson County. No damage or injuries were reported. The landspout did not occur in conjunction with a thunderstorm.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2010Every state in 2010This day in weather historyThe tornado archive for Wyoming, 2010Warnings in Wyoming, June 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: 238639.