High-based thunderstorms generated damaging outflow wind in central 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.
High-based thunderstorms generated damaging outflow wind in central 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 30, 2:34 PM MST, 4 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 334 PM MDT MON JUN 30 2008 .SHORT TERM...TONIGHT THROUGH THURSDAY SCATTERED SHOWERS AND THUNDERSTORMS FORMED AND CONTINUE TO MOVE THROUGH WESTERN WYOMING THIS AFTERNOON. THESE SHOWERS WILL CONTINUE INTO THE EVENING HOURS TONIGHT...TAPERING OFF BY MIDNIGHT AND MAY PRODUCE STRONG GUSTY WINDS AND SMALL HAIL. RIDGE OF HIGH PRESSURE CONTINUES TO BE THE PRIMARY SYSTEM OVER THE CWA FOR THE NEXT COUPLE OF DAYS. HOWEVER...EMBEDDED SHORTWAVES WILL BRING ADDITIONAL INSTABILITY ACROSS THE AREA DURING THE AFTERNOONS AND EVENINGS. COLD FRONT EXPECTED TO MOVE THROUGH THE STATE TUESDAY NIGHT AND WEDNESDAY MORNING...WHICH WILL BRING THE STRONGER SHOWERS AND THUNDERSTORMS ON WEDNESDAY AFTERNOON. TEMPERATURES WILL REMAIN WARMER THROUGH THE SHORT TERM...WITH LOW TO MID 90S ANTICIPATED ACROSS THE EASTERN AND CENTRAL BASINS. THE PASSAGE OF THE COLD FRONT WILL SLIGHTLY COOL TEMPERATURES ON WEDNESDAY...BUT VALUES ARE EXPECTED TO REBOUND BACK INTO THE LOW 90S FOR THURSDAY WHEN THE RIDGE RETURNS IN FORCE...GENERALLY DRYING OUT CONDITIONS OTHER THAN THE EXTREME NORTH. WINDS WILL GENERALLY REMAIN LIGHT ON THURSDAY IN RESPONSE TO THE RE-AMPLIFICATION OF THE RIDGE. .LONG TERM...THURSDAY NIGHT THROUGH MONDAY BEST CHANCE OF STORMS THURSDAY AFTERNOON AND EVENING LOOKS TO BE OVER THE NORTH AND EAST ZONES WHERE SOME MOISTURE TO RESIDE AND INSTABILITY. LITTLE OR NO ACTIVITY ELSEWHERE AS AIRMASS DRY AND MORE STABLE. UPPER RIDGE AXIS OVER WY FRIDAY WITH THE FOURTH OF JULY BEING AS HOT AS A FIRECRACKER. ISOLATED STORMS AT BEST OVER THE NORTH ZONES IN THE AFTERNOON AND EVENING. GFS AND ECMWF BRING A SHORTWAVE ACROSS SOUTHERN CANADA AND THE NORTHERN ROCKIES SATURDAY INTO SATURDAY NIGHT. BEST CHANCE OF STORMS WILL BE OVER THE NORTH WITH ISOLATED STORMS OVER THE CENTRAL AND SOUTH. SUNDAY LOOKS DRY WITH WEAK HIGH PRESSURE OVER THE AREA WITH ONLY A FEW DEGREES OF COOLING EXPECTED. THE UPPER RIDGE BUILDS BACK INTO THE REGION NEXT MONDAY WITH DRY WEATHER FOR NOW. AS FOR TEMPS...80S AND 90S WILL PREVAIL WITH 60S AND 70S FOR THE HIGH COUNTRY. && .AVIATION... DOMINANT RIDGE OVER WYOMING WILL CONTINUE TO BRING VFR CONDITIONS WITH SOME CLOUDS FROM 100-250 AGL TODAY. THE WESTERN AREAS OF THE STATE INCLUDING KBPI, KCOD, KJAC, KPNA...KRKS, AND KWRL MAY SEE SOME ISOLATED THUNDERSTORMS THIS AFTERNOON...WITH MODERATELY GUSTY WINDS AND SMALL HAIL THE POTENTIAL HAZARDS. THESE THUNDERSTORMS SHOULD CLEAR OUT OVERNIGHT...LEAVING THE AREA WITH MOSTLY CLEAR/PARTLY CLOUDY SKIES AND LIGHT WINDS INTO THE MORNING HOURS. && .FIRE WEATHER... SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH WESTERN WYOMING THIS AFTERNOON AND EVENING...TAPERING OFF DURING THE LATER EVENING. MEANWHILE...WARM TEMPERATURES AND LIGHT WINDS WILL CONTINUE OVER THE FORECAST AREA TUESDAY AS A RIDGE REMAINS OVER THE INTERMOUNTAIN WEST. EMBEDDED DISTURBANCES...INCLUDING A COLD FRONT WHICH WILL MOVE THROUGH THE STATE LATE TUESDAY INTO WEDNESDAY...WILL IMPACT PORTIONS OF THE FORECAST AREA. THESE FEATURES WILL CAUSE ADDITIONAL SHOWER AND THUNDERSTORM ACTIVITY. THE COLD FRONT PASSAGE WILL BRING SLIGHTLY COOLER TEMPERATURES ON WEDNESDAY...THOUGH TEMPERATURES WILL BE ABLE TO EFFECTIVELY REBOUND ON THURSDAY INTO THE LOW 90S. HUMIDITIES ACROSS THE CENTRAL AND EASTERN BASINS WILL REMAIN LOW OVER THE NEXT FEW DAYS...WITH VALUES IN THE LOW TO MID TEENS. WINDS WILL BE STRONG AROUND SHOWER ACTIVITY. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...BRANHAM LONG TERM...AR AVIATION...BERC/DOMKE FIRE WEATHER...BRANHAM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 500 AM MDT MON JUN 30 2008 WYZ001>020-022>030-011200- 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- 500 AM MDT MON JUN 30 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED SHOWERS AND THUNDERSTORMS IN THE NORTHWESTERN MOUNTAINS THIS AFTERNOON AND EVENING WILL HAVE THE POTENTIAL TO PRODUCES STRONG GUSTY WINDS AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED TUESDAY AND WEDNESDAY...MAINLY IN THE MOUNTAINS AND NORTH TUESDAY AND EAST OF THE DIVIDE WEDNESDAY. ISOLATED THUNDERSTORMS ARE EXPECTED IN NORTHERN WYOMING AS WELL AS IN JOHNSON AND NATRONA COUNTIES THURSDAY. FRIDAY LOOKS HOT FOR THE FOURTH OF JULY WITH ISOLATED AFTERNOON AND EVENING STORMS OVER THE NORTH. SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY UNUSUALLY STRONG WIND GUSTS AND ANY HAIL IN THUNDERSTORMS THIS AFTERNOON AND EVENING. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 231 PM MDT MON JUN 30 2008 WYZ001>003-012-013-016-302130- ABSAROKA MOUNTAINS-CODY FOOTHILLS-JACKSON HOLE- TETON AND GROS VENTRE MOUNTAINS-UPPER WIND RIVER BASIN- YELLOWSTONE NATIONAL PARK- 231 PM MDT MON JUN 30 2008 THROUGH 330 PM SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREAT ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS UP TO 40 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...YELLOWSTONE NATIONAL PARK...CODY...JACKSON...AND DUBOIS. WYZ014-015-023>027-302130- SALT RIVER AND WYOMING RANGES-SOUTH LINCOLN COUNTY-STAR VALLEY- UPPER GREEN RIVER BASIN-UPPER GREEN RIVER BASIN FOOTHILLS- WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- 231 PM MDT MON JUN 30 2008 THROUGH 330 PM SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREAT ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS UP TO 40 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...KEMMERER... AFTON...PINEDALE...AND LABARGE. WYZ028>030-302130- EAST SWEETWATER COUNTY-FLAMING GORGE-ROCK SPRINGS AND GREEN RIVER- 231 PM MDT MON JUN 30 2008 THROUGH 330 PM SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREAT ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS UP TO 40 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...FARSON...ROCK SPRINGS...GRANGER...AND INTERSTATE 80 BETWEEN GRANGER AND WAMSUTTER. BERC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 326 PM MDT MON JUN 30 2008 WYZ001>003-012-013-016-302230- ABSAROKA MOUNTAINS-CODY FOOTHILLS-JACKSON HOLE- TETON AND GROS VENTRE MOUNTAINS-UPPER WIND RIVER BASIN- YELLOWSTONE NATIONAL PARK- 326 PM MDT MON JUN 30 2008 THROUGH 430 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREATS ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS TO 45 MPH...AND SMALL HAIL. AREAS AFFECTED INCLUDE...YELLOWSTONE NATIONAL PARK...CODY...JACKSON...AND DUBOIS. WYZ014-015-023>027-302230- SALT RIVER AND WYOMING RANGES-SOUTH LINCOLN COUNTY-STAR VALLEY- UPPER GREEN RIVER BASIN-UPPER GREEN RIVER BASIN FOOTHILLS- WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- 326 PM MDT MON JUN 30 2008 THROUGH 430 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREATS ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS TO 45 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...KEMMERER... AFTON...PINEDALE...AND LABARGE. WYZ028>030-302230- EAST SWEETWATER COUNTY-FLAMING GORGE-ROCK SPRINGS AND GREEN RIVER- 326 PM MDT MON JUN 30 2008 THROUGH 430 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREATS ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS TO 45 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...FARSON...ROCK SPRINGS...GRANGER...AND INTERSTATE 80 BETWEEN GRANGER AND WAMSUTTER. WYZ007-017-018-302230- LANDER FOOTHILLS-OWL CREEK AND BRIDGER MOUNTAINS-WIND RIVER BASIN- 326 PM MDT MON JUN 30 2008 THROUGH 430 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE AREA. THE PRIMARY THREATS ASSOCIATED WITH THESE STORMS WILL BE OCCASIONAL CLOUD TO GROUND LIGHTNING...THUNDERSTORMS OUTFLOW WINDS TO 45 MPH AND SMALL HAIL. AREAS AFFECTED INCLUDE...LANDER... RIVERTON...BOYSEN DAM...AND LYSITE. BERC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 442 PM MDT MON JUN 30 2008 WYZ001>003-302330- ABSAROKA MOUNTAINS-CODY FOOTHILLS-YELLOWSTONE NATIONAL PARK- 442 PM MDT MON JUN 30 2008 THROUGH 530 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH THE AREA. HEAVY RAIN...OCCASIONAL CLOUD TO GROUND LIGHTNING...AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. AREAS AFFECTED INCLUDE...YELLOWSTONE NATIONAL PARK...WAPITI...AND CODY. HEAVY RAIN MAY CAUSE MINOR STREET FLOODING IN SOME AREAS. BERC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 618 PM MDT MON JUN 30 2008 WYZ003>006-008-010130- BIGHORN MOUNTAINS WEST-CODY FOOTHILLS-NORTH BIG HORN BASIN- SOUTHEAST BIG HORN BASIN-SOUTHWEST BIG HORN BASIN- 618 PM MDT MON JUN 30 2008 THROUGH 730 PM...SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH THE AREA. HEAVY RAIN...OCCASIONAL CLOUD TO GROUND LIGHTNING...WIND GUSTS TO 45 MPH...AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. AREAS AFFECTED INCLUDE...GREYBULL...WORLAND...GRANITE PASS...AND LOVELL. BERC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 757 PM MDT MON JUN 30 2008 WYZ009>011-010300- BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- 757 PM MDT MON JUN 30 2008 A LINE OF THUNDERSTORMS WILL MOVE OFF THE EAST SLOPES OF THE BIG HORN MOUNTAINS THROUGH EASTERN JOHNSON COUNTY BETWEEN 8 PM AND 9 PM. THESE STORMS WILL CROSS INTERSTATE 25 BETWEEN BUFFALO AND KAYCEE BETWEEN 830 PM AND 850 PM. THE MAIN HAZARD WITH THESE STORMS WILL BE STRONG WIND GUSTS OF 40 TO 50 MPH PRIMARILY OUT OF THE WEST...CAUSING STRONG CROSSWIND ACROSS THE INTERSTATE. ALSO EXPECT BRIEF HEAVY DOWNPOURS WITH SMALL PEA TO MARBLE-SIZED HAIL... LIMITED VISIBILITY AND PONDING OF WATER ON THE INTERSTATE. AEM
The national radar mosaic for the moment the first event began.
1 thunderstorm wind. Local standard time, as filed.
The ASOS at Riverton Regional Airport recorded a wind gust to 65 mph. The damaging wind downed one large tree on the Central Wyoming College campus.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2008Every state in 2008This day in weather historyWarnings in Wyoming, June 2008
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: 99243.