Severe thunderstorms developed across eastern Idaho and swept east across Lincoln County. The first storm had visible signs of rotation and eventually dropped golf ball sized hail in Star Valley Ranch.
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.
Severe thunderstorms developed across eastern Idaho and swept east across Lincoln County. The first storm had visible signs of rotation and eventually dropped golf ball sized hail in Star Valley Ranch. A second storm developed later in the evening and impacted the south end of Star Valley around Afton. There were multiple reports of large hail.
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 15, 3:00 PM MST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 400 PM MDT MON JUN 15 2015 .SHORT TERM...TONIGHT THROUGH TUESDAY ACTIVE PERIOD IN STORE AS WE'VE TALKED ABOUT FOR DAYS NOW. MORNING SHORTWAVE HAS FIRED ELEVATED CONVECTION FROM WEST TO EAST. THIS WILL MOVE TOWARDS AND INTO OUR FAR ERN/NERN ZONES THROUGH THE AFTERNOON. IN THE MEANTIME...WE WAIT FOR DAYTIME HEATING TO DESTABILIZE THE ATMOSPHERE WITH THE ERN HALF TAKING THE LONGEST TIME DUE TO MORNING STRATUS. MORNING SOUNDING ANALYSIS IS STILL SHOWING SIGNIFICANT BUILDING CAPE THROUGH 00Z WITH FAVORABLE SHEAR...LL SE FLOW BECOMING MODERATE WLY IN THE MID LEVELS AND UP. WE'VE HAD SEVERE WORDING IN OUR FORECAST SINCE SATURDAY AND THAT STILL LOOKS GOOD. MID MORNING SPC DAY1 ALSO HAS SLIGHT RISK OVER MOST OF THE AREA EXCEPT FOR THE FAR NORTH. EXITING JET STREAK AND NOSE OF APPROACHING JET STILL LOOKS LIKE IT HAS THE POTENTIAL TO CREATE AN UPPER DIVERGENCE COUPLET OVER CENTRAL WYO BY THIS EVENING. SHORTWAVE ALONG THE OREGON/NRN CA COAST IS STILL EXPECTED TO ARRIVE IN THE WEST LATE THIS AFTERNOON AND THEN MOVE EAST ACROSS THE REST OF THE AREA THIS EVENING INTO THE OVERNIGHT HOURS. FRONTAL BOUNDARY WILL REMAIN ALONG THE DIVIDE/RED DESERT WITH INCREASING LL MOISTURE NORTH OF THIS BOUNDARY. POTENTIAL FOR THUNDERSTORMS TO CONGEAL INTO A MCS OVER CENTRAL WYO IS STILL THERE BY TONIGHT AS THE UPPER FORCING/SHORTWAVE FOCUS THE CONVECTION COMBINED WITH THE FRONTAL BOUNDARY. PW'S AROUND AN INCH WILL INCREASE THE FLASH FLOOD THREAT THROUGH THE NIGHT. TUESDAY STILL HAS THE POTENTIAL TO BE ANOTHER ACTIVE DAY AT LEAST FOR AREAS EAST OF THE DIVIDE WHERE THE FRONT WILL REMAIN IN PLACE AND THUS HIGH LL MOISTURE AND STILL FAVORABLE SHEAR. IDEA OF SEVERE WORDING STILL LOOKS GOOD IN CENTRAL WYO TUESDAY AFTERNOON WHERE SLIGHT RISK REMAINS. .LONG TERM...TUESDAY NIGHT THROUGH MONDAY NIGHT STRONG THUNDERSTORMS WILL CONTINUE INTO TUESDAY EVENING...WITH THE POTENTIAL FOR SOME SEVERE STORM ACTIVITY. CONDITIONS WILL WEAKEN WITH THE LOSS OF DAYLIGHT. ONLY THE NORTHERN MOUNTAINS WILL SEE MUCH IN THE WAY OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. A FLATTENED RIDGE WILL MOVE INTO THE FORECAST AREA WEDNESDAY...HELPING TO KEEP SHOWER ACTIVITY SOMEWHAT CONFINED TO THE NORTHERN THIRD OF THE STATE. THE REMAINDER OF THE AREA CAN EXPECT DRIER CONDITIONS. MOST AREAS WILL SEE A CONTINUATION OF THE WARMING TREND. THE RIDGE WILL AMPLIFY THURSDAY...WITH THE AXIS MOVING INTO CENTRAL WYOMING BY LATE THURSDAY AFTERNOON. THE CHANGE TO A STRONGER SOUTHWEST FLOW WILL PERMIT SOME ADDITIONAL MOISTURE AND INSTABILITY TO MOVE INTO WESTERN WYOMING WITH SOME SHOWERS AND THUNDERSTORMS POSSIBLE FRIDAY AFTERNOON. THE SHORT WAVE RIDGE OVER THE REGION ON THURSDAY...WILL BE QUICKLY EXITING TO THE EAST BY 12Z FRIDAY. ANY OVERNIGHT CONVECTION WILL BE CONFINED ACROSS NORTHERN PORTIONS OF THE CWA. OTHERWISE...THE PERIOD WILL BE DOMINATED BY ZONAL FLOW THROUGH SUNDAY NIGHT MONDAY...WHEN ANOTHER SHORTWAVE RIDGE QUICKLY MOVES ACROSS THE AREA. A FRONTAL BOUNDARY WILL BE SOMEWHAT STATIONARY ACROSS SOUTHERN MONTANA AT 12Z FRIDAY...AND SLOWLY PUSH SOUTHWARD INTO CENTRAL WYOMING BY 12Z SUNDAY. THE CHANCE FOR AFTERNOON THUNDERSTORMS WILL REMAIN ALONG THE WYOMING/MONTANA BORDER AND JOHNSON COUNTY ON BOTH FRIDAY AND SATURDAY. CONDITIONS WILL BE DRY ACROSS THE REST OF THE FORECAST AREA DURING THIS TIME AND THROUGH THE END OF THE PERIOD. ANOTHER DRY COLD FRONT WILL MAKE ITS WAY ACROSS NORTHERN PORTIONS MONDAY NIGHT. TEMPERATURES WILL BE SLIGHTLY ABOVE NORMAL THROUGH THE PERIOD...WITH WIDESPREAD 80S FOR ALL BUT WESTERN PORTIONS. THE COOLEST DAY WILL BE SATURDAY WITH 70S AND LOWER 80S ACROSS THE CWA. && .AVIATION.../00Z ISSUANCE/ AREAS OF RAIN TO CONTINUE AFTER 06Z TONIGHT. OTHERWISE...VFR CONDITIONS WILL PREVAIL LATER TONIGHT THROUGH TUESDAY. A WEAK BOUNDARY ACROSS THE AREA WILL BE THE FOCUS FOR WIDELY SCATTERED AFTERNOON AND EARLY EVENING THUNDERSTORMS. KCOD TO KGEY AND NORTH TO THE MONTANA BORDER COULD SEE THE MOST ACTIVITY WITH BRIEF HEAVY RAIN AND GUSTY SURFACE WIND. A FEW MOUNTAIN THUNDERSTORMS ARE ALSO POSSIBLE THE NEXT FEW DAYS...AS THE FLOW ALOFT REMAINS WEST TO EAST. && .FIRE WEATHER... FIRE DANGER SHOULD REMAIN RELATIVELY LOW OVER THE NEXT FEW DAYS AS MOISTURE AND PRECIPITATION CHANCES INCREASE. CHANCES FOR SHOWERS AND THUNDERSTORMS WILL CONTINUE TO GROW THROUGH THE EVENING HOURS AND CONTINUE IN MANY AREAS OVERNIGHT. SOME STORMS MAY BE SEVERE AND OR CAUSE FLASH FLOODING. STRONG STORMS WILL ALSO BE POSSIBLE ON TUESDAY...WITH A FEW SEVERE STORMS LIKELY OVER THE CENTRAL AND NORTHERN FORECAST AREA. && .RIW WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH TUESDAY EVENING FOR WYZ002>011-015>020- 022. && SHORT TERM...PS LONG TERM...BRANHAM/LAVOIE AVIATION...KPL FIRE WEATHER...PS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 235 PM MDT MON JUN 15 2015 WYZ001>020-022>030-161200- YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS- NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN- SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS- BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE- WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST- UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS- GREEN MOUNTAINS AND RATTLESNAKE RANGE- NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY- SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS- UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY- ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY- 235 PM MDT MON JUN 15 2015 ...SEVERE THUNDERSTORM WATCH UNTIL 11 PM MDT FOR MUCH OF CENTRAL AND WESTERN WYOMING... ...FLASH FLOOD WATCH FOR NORTHERN AND CENTRAL WYOMING ALONG AND EAST OF THE CONTINENTAL DIVIDE FROM 3 PM THIS AFTERNOON THROUGH 12 MIDNIGHT TUESDAY NIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WY...CENTRAL WYOMING...NORTH CENTRAL WYOMING...NORTHWEST WYOMING...SOUTH CENTRAL WYOMING AND WEST CENTRAL WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED TO NUMEROUS THUNDERSTORMS. A FEW STRONG TO SEVERE THUNDERSTORMS ALSO EXPECTED ALONG WITH POTENTIAL FLASH FLOOD PRODUCING STORMS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY...ISOLATED TO SCATTERED THUNDERSTORMS ACROSS NORTHERN AND CENTRAL WYOMING. A FEW STRONG TO SEVERE THUNDERSTORMS WILL AGAIN BE POSSIBLE ALONG WITH SOME WITH VERY HEAVY RAIN WHICH WILL HAVE THE POTENTIAL TO PRODUCE FLASH FLOODING. WEDNESDAY AND THURSDAY...ISOLATED AFTERNOON AND EVENING THUNDERSTORMS ACROSS NORTHERN WYOMING. FRIDAY AND SATURDAY...ISOLATED TO SCATTERED THUNDERSTORMS MAINLY ALONG AND EAST OF THE DIVIDE. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY FLOODING...RIVERS OUT OF THEIR BANKS...OR NORMALLY DRY WASHES RUNNING WITH WATER. SPOTTERS ARE ALSO ENCOURAGED TO REPORT HEAVY RAIN...HAIL OF ANY SIZE...AND DAMAGING WIND GUSTS. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 313 PM MDT MON JUN 15 2015 WYZ028-030-152200- ROCK SPRINGS AND GREEN RIVER-EAST SWEETWATER COUNTY- 313 PM MDT MON JUN 15 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SWEETWATER COUNTY UNTIL 400 PM MDT... AT 312 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR ROCK SPRINGS...MOVING EAST AT 30 MPH. DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... SWEETWATER COUNTY AIRPORT AROUND 320 PM MDT. SUPERIOR AROUND 335 PM MDT. # THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 103 AND 142. PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO LOCALIZED FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT FOR SOUTH CENTRAL WYOMING. LAT...LON 4156 10925 4178 10929 4197 10862 4152 10854 TIME...MOT...LOC 2112Z 263DEG 27KT 4167 10917 13
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 345 PM MDT MON JUN 15 2015 WYZ030-152230- EAST SWEETWATER COUNTY- 345 PM MDT MON JUN 15 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SWEETWATER COUNTY UNTIL 430 PM MDT... AT 344 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES EAST OF SWEETWATER COUNTY AIRPORT...WHICH IS 19 MILES EAST OF ROCK SPRINGS...MOVING EAST AT 45 MPH. DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... BITTER CREEK REST AREA AROUND 410 PM MDT. TABLE ROCK AROUND 420 PM MDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE PATRICK DRAW NATURAL GAS PROCESSING PLANT...RED DESERT...POINT OF ROCKS...BITTER CREEK... JIM BRIDGERCPACIFICORP POWER PLANT AND TIPTON. # THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 121 AND 169. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT FOR SOUTH CENTRAL WYOMING. LAT...LON 4124 10886 4184 10900 4206 10819 4136 10794 TIME...MOT...LOC 2144Z 256DEG 39KT 4159 10887 13
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 348 PM MDT MON JUN 15 2015 WYZ029-030-152230- EAST SWEETWATER COUNTY-FLAMING GORGE- 348 PM MDT MON JUN 15 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL SWEETWATER COUNTY UNTIL 430 PM MDT... AT 348 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 19 MILES EAST OF LOWE CANYON...WHICH IS 28 MILES EAST OF MANILA...MOVING EAST AT 30 MPH. HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM. THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF SOUTH CENTRAL SWEETWATER COUNTY...INCLUDING THE FOLLOWING LOCATIONS...VERMILLION NATURAL GAS PROCESSING PLANT. # PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT FOR SOUTH CENTRAL WYOMING. LAT...LON 4100 10927 4115 10931 4132 10867 4100 10856 TIME...MOT...LOC 2148Z 259DEG 28KT 4108 10919 13
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 416 PM MDT MON JUN 15 2015 WYZ002-012-014>016-152300- TETON AND GROS VENTRE MOUNTAINS-WIND RIVER MOUNTAINS EAST-UPPER WIND RIVER BASIN-ABSAROKA MOUNTAINS-WIND RIVER MOUNTAINS WEST- 416 PM MDT MON JUN 15 2015 ...SPECIAL WEATHER STATEMENT... AT 415 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES SOUTHWEST OF TOGWOTEE PASS...WHICH IS 17 MILES SOUTHEAST OF MORAN JUNCTION...MOVING EAST AT 25 MPH. HALF INCH HAIL...WINDS IN EXCESS OF 30 MPH...AND FREQUENT LIGHTNING WILL BE POSSIBLE WITH THIS STORM. THIS STRONG THUNDERSTORM WILL BE NEAR... TOGWOTEE PASS AROUND 435 PM MDT. PINNACLE BUTTES AROUND 450 PM MDT. OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE CROOKED CREEK GUEST RANCH...PINNACLE CAMPGROUND...PINNACLES CAMP GROUND...PINNACLE BUTTES LODGE...FALLS CAMPGROUND...BROOKS LAKE CAMPGROUND AND BROOKS LAKE LODGE. # PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT FOR NORTHWESTERN WYOMING. LAT...LON 4354 11036 4375 11036 4395 10981 4344 10975 TIME...MOT...LOC 2215Z 268DEG 23KT 4366 11025 BRANHAM
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
431 PM MDT MON JUN 15 2015
WYZ030-152315-
EAST SWEETWATER COUNTY-
431 PM MDT MON JUN 15 2015
...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL SWEETWATER COUNTY
UNTIL 515 PM MDT...
AT 429 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
TABLE ROCK...WHICH IS 16 MILES SOUTHWEST OF WAMSUTTER...MOVING EAST
AT 30 MPH.
HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM. THE MAIN IMPACT FROM THIS STORM WILL REMAIN JUST SOUTH
OF INTERSTATE 80.
THIS STRONG THUNDERSTORM WILL BE NEAR...
WAMSUTTER AROUND 450 PM MDT.
OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE RED DESERT AND TIPTON.
#
THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 149 AND 178.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
&&
LAT...LON 4195 10846 4200 10786 4166 10790 4166 10793
4144 10793 4135 10794 4130 10846
TIME...MOT...LOC 2229Z 263DEG 40KT 4158 10826
KPLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
504 PM MDT MON JUN 15 2015
WYZ030-152330-
EAST SWEETWATER COUNTY-
504 PM MDT MON JUN 15 2015
...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL SWEETWATER COUNTY
UNTIL 530 PM MDT...
AT 501 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
CRESTON JUNCTION...WHICH IS 13 MILES EAST OF WAMSUTTER...MOVING EAST
AT 30 MPH.
HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM BEFORE IT EXITS SWEETWATER COUNTY. HEAVY RAIN IS LIKELY
ALONG PARTS OF INTERSTATE 80.
#
THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 177 AND 198.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
&&
LAT...LON 4202 10791 4208 10767 4207 10764 4207 10762
4201 10755 4201 10753 4202 10752 4189 10750
4166 10751 4166 10793
TIME...MOT...LOC 2301Z 269DEG 34KT 4172 10773
KPLThe Pocatello radar (KSFX), 141 km away, was scanning. The volume nearest the first event began at 23:12 UTC.
2 hail. Local standard time, as filed.
Trained spotters reported hail ranging in size from quarters to golf balls at Star Valley Ranch.
The Lincoln County Sheriff's Office reported quarter sized hail covering roads in Afton. A trained spotter also reported one inch diameter hail just to the northwest of town.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, June 2015
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: 572455, 572456.