A dry lower atmosphere set the stage for gusty outflow wind from weak convection across southwest Wyoming. A dissipating storm near Rock Springs produced a peak wind gust of 75 mph.
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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 dry lower atmosphere set the stage for gusty outflow wind from weak convection across southwest Wyoming. A dissipating storm near Rock Springs produced a peak wind gust of 75 mph.
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 10, 1:35 PM MST, 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 235 PM MDT MON JUN 10 2013 .SHORT TERM...TONIGHT THROUGH TUESDAY AN UPPER LEVEL LOW PRESSURE TROUGH IN EASTERN IDAHO AND NORTHERN UTAH WILL BRING SOME HIGH BASED SHOWERS AND THUNDERSTORMS TO WESTERN AND CENTRAL WYOMING THIS EVENING WITH VERY STRONG WIND GUSTS POSSIBLE. TEMPERATURES WILL COOL SOME TONIGHT AND TUESDAY. ANOTHER TROUGH WILL PASS OVER THE WEST ON TUESDAY WITH ANOTHER ROUND OF HIGH BASED SHOWERS AND THUNDERSTORMS WITH STRONG WIND GUSTS EXPECTED. .LONG TERM...TUESDAY NIGHT THROUGH MONDAY WEAK SHORTWAVE RIDGE TO TRAVERSE THE FORECAST AREA TUESDAY NIGHT IN THE WAKE OF WEAKENING MID-LEVEL SYSTEM TRACKING EAST ONTO THE PLAINS. UPPER LOW DROPPING INTO THE PACIFIC NORTHWEST WILL INCREASE SOUTHWEST FLOW ACROSS THE GREAT BASIN AND WYOMING FOR WEDNESDAY AND THURSDAY. MID-LEVEL MOISTURE IS EXPECTED TO INCREASE ACROSS WESTERN WYOMING LATE WEDNESDAY MORNING AND AFTERNOON. THIS WILL COUPLE WITH 250MB JET STREAK OF 90KT+ AND LIFTED INDICES AROUND -3 TO PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE NORTHWEST QUARTER OF THE STATE. SUFFICIENT JET DYNAMICS LINGER IN THIS REGION OVERNIGHT AND HAVE BUMPED UP CHANCE OF SHOWERS/STORMS ACCORDINGLY WEDNESDAY EVENING AND OVERNIGHT. GUSTY SOUTHWEST SURFACE WIND OF 20 TO 40 MPH TO BE COMMON ACROSS SOUTHWEST AND CENTRAL WYOMING ON THURSDAY AS PRESSURE GRADIENT TIGHTENS AHEAD OF UPPER LOW AND ASSOCIATED COLD FRONT. THIS SOUTHWEST FLOW WILL BE DRY AND EXPECT SOUTHWEST SURGE AT THE SURFACE TO PUSH WELL INTO THE BIG HORN BASIN AND JOHNSON COUNTY. THEREFORE...ONLY VERY LOW CHANCES OF SHOWERS/STORMS ACROSS THE FAR NORTH ON THURSDAY AFTERNOON AND EVENING. TEMPERATURES WILL WARM WEDNESDAY AND THURSDAY FOLLOWING THE BRIEF TUESDAY COOL DOWN. COLD FRONT ASSOCIATED WITH UPPER LOW IS POISED ON OUR DOOR STEP BY 00Z/FRI. THIS COOLER AIR WILL SWEEP EAST THURSDAY NIGHT AND COOL OVERNIGHT LOW TEMPERATURES... PARTICULARLY IN YELLOWSTONE NP. UPPER LOW THAT BROUGHT THE COOLER AIR FOR FRIDAY WILL STAY TO OUR NORTH FRIDAY AND SATURDAY WITH DRY...WESTERLY FLOW PREVAILING ACROSS THE REGION. FRIDAY TEMPERATURES WILL TREND DOWN TO MORE SEASONAL LEVELS WITH 700MB TEMPS AROUND 10C IN THE CENTRAL FORECAST AREA. ANOTHER UPPER LOW TRIES TO REPLACE PREVIOUS ONE ALBEIT FARTHER TO THE WEST OFF THE PACIFIC NORTHWEST COAST. THIS NEARLY STATIONARY LOW WILL SET-UP SHOP OFF THE COAST BY 00Z/SUN. SATURDAY WILL SEE TEMPERATURES ALREADY BEGIN TO REBOUND INTO THE 80S ACROSS MOST OF THE BASINS AND VALLEYS UNDER ABUNDANT SUNSHINE. RIDGE AXIS OVER THE SOUTHERN AND CENTRAL ROCKIES WILL EXTEND INTO THE INTERMOUNTAIN WEST FOR SUNDAY AND MONDAY. 700MB TEMPERATURES WILL CLIMB BACK TO AROUND 14C...PERHAPS WARMER...BY MONDAY. THUS...TEMPERATURES TO BE BACK TO 10-15F ABOVE NORMAL BY THE START OF NEXT WEEK. DRIER SOUTHWEST FLOW WILL KEEP RAIN CHANCES VERY LOW THROUGH THE EXTENDED. BEST CHANCES WILL BE ACROSS THE VERY FAR NORTH AND EAST OF THE BIGHORNS. && .AVIATION.../00Z ISSUANCE/ AN UPPER LEVEL LOW WILL LIFT ACROSS THE GREAT BASIN THROUGH TONIGHT. AHEAD OF THIS FEATURE...AN EAST TO WEST SURFACE TROUGH WILL INTENSIFY ACROSS SOUTHERN WYOMING INTO THE NORTHERN GREAT BASIN AND LIFT NORTH THROUGH THE EVENING. THE BEST MOISTURE WILL BE ACROSS NORTHERN WYOMING WITH THE DEEPEST INSTABILITY ACROSS THE SOUTH. THE NORTHERN THUNDERSTORMS WILL HAVE A BETTER CHANCE OF RAIN AND SMALL HAIL...WHILE VERY STRONG WIND GUSTS FROM HIGH BASED STORMS WILL BE OVER CENTRAL AND SOUTH AREAS. THIS ACTIVITY SHOULD LIFT INTO NORTHERN WYOMING AND SOUTHERN MONTANA THROUGH THE EVENING INTO THE EARLY MORNING HOURS WITH THE BEST COVERAGE AND STRONGER THUNDERSTORMS MAINLY VCNTY AND NORTH OF A KCOD-KBYG LINE FROM 03Z-09Z TUESDAY. ANOTHER PACIFIC LOW PRESSURE TROUGH WILL BRING ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS INTO THE WEST AROUND 18Z TUESDAY SPREADING EAST THROUGH 00Z WEDNESDAY. AGAIN THE BEST CHANCE FOR RAIN AND HAIL WILL BE ACROSS THE NORTH...WHILE HIGHER BASED THUNDERSTORMS IN CENTRAL AND SOUTH AREAS WILL PRODUCE VERY STRONG OUTFLOW WINDS. && .FIRE WEATHER... AN UPPER LEVEL LOW PRESSURE TROUGH IN EASTERN IDAHO AND NORTHERN UTAH WILL BRING SOME HIGH BASED SHOWERS AND THUNDERSTORMS TO WESTERN AND CENTRAL WYOMING THIS EVENING WITH VERY STRONG WIND GUSTS POSSIBLE. TEMPERATURES WILL COOL SOME TONIGHT AND TUESDAY. ANOTHER TROUGH WILL PASS OVER THE WEST ON TUESDAY WITH ANOTHER ROUND OF HIGH BASED SHOWERS AND THUNDERSTORMS WITH STRONG WIND GUSTS EXPECTED. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...C.BAKER LONG TERM...CNJ AVIATION...C.BAKER FIRE WEATHER...C.BAKER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 400 AM MDT MON JUN 10 2013 WYZ001>020-022>030-111200- 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- 400 AM MDT MON JUN 10 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT WIDELY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ACROSS THE NORTHWEST...WITH ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE ELSEWHERE. THE STRONGEST THUNDERSTORMS ARE EXPECTED ACROSS THE NORTHWEST...ROUGHLY NORTH OF A LINE FROM JACKSON TO WORLAND. IN THIS AREA...A FEW THUNDERSTORMS COULD BECOME SEVERE...WITH DAMAGING WINDS AND LARGE HAIL. FOR THE REST OF THE AREA...THE PRIMARY HAZARD WILL BE VERY STRONG WINDS FROM DRY MICROBURSTS. THUNDERSTORMS ACROSS THE NORTH COULD LAST UNTIL AROUND MIDNIGHT...BEFORE DISSIPATING OR MOVING INTO MONTANA. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY TUESDAY AND WEDNESDAY...WIDELY SCATTERED MOUNTAIN THUNDERSTORMS WITH ISOLATED THUNDERSTORMS ACROSS THE NORTH HALF OF THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT THUNDERSTORM WIND GUSTS OVER 40 MPH...ANY HAIL...OR ANY DAMAGE. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 136 PM MDT MON JUN 10 2013 WYZ028>030-102015- EAST SWEETWATER COUNTY WY-FLAMING GORGE WY-ROCK SPRINGS AND GREEN RIVER WY- 136 PM MDT MON JUN 10 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SWEETWATER COUNTY UNTIL 215 PM MDT... AT 134 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING SHOWERS AND STRONG THUNDERSTORMS TO THE SOUTH AND SOUTHEAST OF ROCK SPRINGS. THESE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 30 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE SHOWERS AND STORMS...ALONG WITH FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... SWEETWATER COUNTY AIRPORT AROUND 145 PM MDT STATE HWY 430 MILE MARKER 20 AROUND 145 PM MDT. THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 107 AND 141. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4184 10870 4127 10838 4119 10913 4156 10922 TIME...MOT...LOC 1934Z 243DEG 24KT 4141 10901 JONES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 213 PM MDT MON JUN 10 2013 WYZ030-102100- EAST SWEETWATER COUNTY WY- 213 PM MDT MON JUN 10 2013 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN SWEETWATER COUNTY UNTIL 300 PM MDT... AT 212 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES EAST OF I80 EXIT 122...OR 22 MILES EAST OF ROCK SPRINGS. ADDITIONAL SHOWERS AND WEAKER THUNDERSTORMS ARE ALSO LOCATED EAST OF ROCK SPRINGS AND SOUTH OF I80. ALL OF THE SHOWERS AND STORMS ARE MOVING NORTHEAST AT 35 MPH. WIND GUSTS UP TO 55 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... RURAL CENTRAL SWEETWATER COUNTY THROUGH 300 PM MDT THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 124 AND 162. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TRUCKS SHOULD BE PREPARED FOR GUSTY CROSSWINDS ON INTERSTATE 80 THROUGH SWEETWATER COUNTY. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4208 10840 4138 10807 4130 10876 4179 10895 TIME...MOT...LOC 2012Z 240DEG 31KT 4170 10879 JONES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 219 PM MDT MON JUN 10 2013 WYZ019-020-022-102100- CASPER MOUNTAIN WY-GREEN MOUNTAINS AND RATTLESNAKE RANGE WY-NATRONA COUNTY LOWER ELEVATIONS WY- 219 PM MDT MON JUN 10 2013 ...SIGNIFICANT WEATHER ADVISORY FOR NATRONA COUNTY UNTIL 300 PM MDT... AT 215 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES SOUTHEAST OF POWDER RIVER...OR 30 MILES WEST OF CASPER...MOVING EAST-NORTHEAST AT 35 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... GOLDENEYE RESERVOIR AROUND 230 PM MDT. U.S. HWY 20/26 MILE MARKER 20 AROUND 235 PM MDT. HOMA HILLS AROUND 255 PM MDT. ANTELOPE HILLS...I25 EXIT 197 AROUND 300 PM MDT. THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 176 AND 224. ADDITIONAL SHOWERS AND THUNDERSTORMS HAVE ERUPTED ACROSS NATRONA COUNTY EARLY THIS AFTERNOON. ANY OF THESE SHOWERS OR STORMS...EVEN THOSE THAT ARE WEAK...WILL BE CAPABLE OF PRODUCING WIND GUSTS OF 40 TO 50 MPH WITH LITTLE IF ANY RAINFALL. BOATERS ON AREA LAKES SHOULD HEAD TO SHORE IF SHOWERS AND STORMS APPROACH. IF THREATENING WEATHER APPROACHES YOUR AREA...YOU SHOULD TAKE SHELTER IN A STURDY BUILDING. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4242 10607 4244 10707 4318 10725 4336 10607 TIME...MOT...LOC 2016Z 256DEG 30KT 4298 10685 JONES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 227 PM MDT MON JUN 10 2013 WYZ002-005>007-102115- ABSAROKA MOUNTAINS WY-OWL CREEK AND BRIDGER MOUNTAINS WY-SOUTHEAST BIG HORN BASIN WY-SOUTHWEST BIG HORN BASIN WY- 227 PM MDT MON JUN 10 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WASHAKIE AND CENTRAL HOT SPRINGS COUNTIES UNTIL 315 PM MDT... AT 225 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR HWY JCT 170 AND 120...OR 12 MILES NORTHWEST OF THERMOPOLIS...MOVING NORTHEAST AT 35 MPH. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING. OTHER SHOWERS AND WEAKER STORMS DEVELOPING OVER THE HIGHER TERRAIN OF THE OWL CREEK MOUNTAINS WILL ALSO BE CAPABLE OF PRODUCING WIND GUSTS TO NEAR 50 MPH. THIS STORM WILL BE NEAR... LUCERNE AROUND 235 PM MDT. KIRBY AND WINCHESTER AROUND 240 PM MDT. THE WYOMING BOYS SCHOOL AROUND 255 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4406 10819 4376 10758 4358 10879 4387 10902 TIME...MOT...LOC 2026Z 246DEG 38KT 4377 10835 JONES
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 253 PM MDT MON JUN 10 2013 WYZ007-009-019-020-102130- BIGHORN MOUNTAINS SOUTHEAST WY-GREEN MOUNTAINS AND RATTLESNAKE RANGE WY-NATRONA COUNTY LOWER ELEVATIONS WY-OWL CREEK AND BRIDGER MOUNTAINS WY- 253 PM MDT MON JUN 10 2013 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN NATRONA COUNTY UNTIL 330 PM MDT... AT 251 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES SOUTHEAST OF U.S. HWY 20/26 MILE MARKER 70...MOVING NORTHEAST AT 30 MPH. WIND GUSTS UP TO 50 MPH AND DEADLY CLOUD-TO-GROUND LIGHTNING ARE EXPECTED WITH THIS STORM. THIS STORM WILL BE NEAR... HILAND AROUND 300 PM MDT. WALTMAN REST AREA AROUND 305 PM MDT. ARMINTO AROUND 315 PM MDT. ADDITIONAL SHOWERS AND STORMS ARE EXPECTED TO DEVELOP NEAR THE NATRONA-FREMONT COUNTY LINE THIS AFTERNOON. WIND GUSTS OF 40 TO 50 MPH ARE QUITE POSSIBLE WITH EVEN WEAK SHOWERS OR STORMS. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4277 10749 4328 10750 4344 10691 4290 10672 TIME...MOT...LOC 2051Z 244DEG 27KT 4309 10745 JONES
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
308 PM MDT MON JUN 10 2013
WYZ002>004-102145-
ABSAROKA MOUNTAINS WY-CODY FOOTHILLS WY-NORTH BIG HORN BASIN WY-
308 PM MDT MON JUN 10 2013
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PARK COUNTY UNTIL
345 PM MDT...
AT 306 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHWEST OF HWY JCT 296 AND 120...OR 16
MILES NORTHWEST OF CODY...MOVING NORTHEAST AT 40 MPH.
WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
DANGEROUS CLOUD-TO-GROUND LIGHTNING.
THIS STORM WILL BE NEAR...
STATE HWY 294 MILE MARKER 10 AROUND 330 PM MDT.
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.
LAT...LON 4499 10864 4459 10863 4456 10902 4451 10922
4473 10939
TIME...MOT...LOC 2107Z 239DEG 36KT 4471 10921
JONESThe Riverton/Lander radar (KRIW), 170 km away, was scanning. The volume nearest the first event began at 21:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Outflow from a dissipating thunderstorm produced strong and erratic outflow wind at the Rock Springs-Sweetwater County Airport. A peak gust of 75 mph was clocked at 1430MST from the southwest.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2013Every state in 2013This day in weather historyWarnings in Wyoming, June 2013
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: 453363.