An upper level low over southwest Wyoming provided instability and spin to the atmospshere. A thunderstorm spawned a brief tornado off of Blue Rim Road in Sweetwater County, near the intersection of State Routes 372 and 28.
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.
An upper level low over southwest Wyoming provided instability and spin to the atmospshere. A thunderstorm spawned a brief tornado off of Blue Rim Road in Sweetwater County, near the intersection of State Routes 372 and 28. The tornado was observed up-close and from two different distant vantage points, but remained over open country and caused no damage.
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 Sep 15, 1:58 PM MST, 2 hours 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 258 PM MDT SUN SEP 15 2013 .SHORT TERM...TONIGHT THROUGH MONDAY AN UPPER LEVEL HIGH PRESSURE CENTER OVER MONTANA WITH AN UPPER LEVEL LOW PRESSURE CENTER OVER NORTHWEST COLORADO PRODUCING MOIST SOUTHEAST FLOW ALOFT WILL CONTINUE TO SPREAD MOISTURE OVER SOUTHERN AND CENTRAL WYOMING AND UP ALONG THE CONTINENTAL DIVIDE THIS EVENING WITH SHOWERS AND ISOLATED THUNDERSTORMS OVER CENTRAL AND SOUTHERN WYOMING AND THE MOUNTAINS WITH DECREASING SHOWERS TO THE WEST AWAY FROM THE CONTINENTAL DIVIDE. COOLER AND MORE STABLE AIR WILL BE OVER THE NORTH WITH CLEARING. WITH CLEARING AREAS OF FOG WILL DEVELOP IN THE NORTHERN AND CENTRAL BASINS AND WESTERN VALLEYS AFTER MIDNIGHT CONTINUING INTO LATE MONDAY MORNING. A HIGH PRESSURE RIDGE OVER THE WESTERN GREAT BASIN WILL MOVE RAPIDLY EAST AND BUILD NORTH BRINGING DRY SOUTHWEST FLOW ALOFT TOWARDS SUNRISE MONDAY. THE SOUTHWEST FLOW ALOFT WILL INCREASE ACROSS THE AREA THROUGH THE DAY. WITH HEATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL DEVELOP MONDAY AFTERNOON OVER THE WESTERN MOUNTAINS ALONG AND WEST OF THE CONTINENTAL DIVIDE. EAST OF THE MOUNTAINS CONDITIONS SHOULD BE DRY. TEMPERATURES WILL WARM AS THE SOUTHWEST FLOW INCREASES OVER THE AREA. .LONG TERM...MONDAY NIGHT THROUGH SUNDAY RELATIVELY PROGRESSIVE UPR PATTERN WILL CONTINUE AS CHANGES FROM WIDESPREAD DEEP SOUTHEASTERLIES AND MID LVL BACKING COLD ADV...AROUND WHAT WAS A SLOW MOVING NEARLY BLOCKED UPR LOW...AWASH IN MODEST PVA AND MID TO UPR LIFT AHEAD OF THE UPR TROF... MORPHS INTO A MORE NORMAL STRENGTHENING CYCLONIC SWRLY REGIME BEHIND THE EXITING SW LOW ON MONDAY AS MODERATE RIDGING TAKES PLACES AHEAD OF WHAT WILL BE ANOTHER RAPIDLY APPROACHING SW SPINNING IN FROM EPAC. BEGINNING MONDAY NIGHT THEN...RELATIVELY DRY WITH ONLY ISOLATED CHANCES FOR PRECIP OVER THE MOUNTAINS...MAINLY THE WINDS AND ABSAROKAS...ASSOCIATED WITH A MINOR DISTURBANCE THAT WILL RIDE THE TAIL OF THE EXITING SW/LOW MENTIONED ABOVE...AND IS CURRENTLY LOCATED IN WV IMAGERY JUST OVER CNTRL CALIFORNIA. DRY ELSEWHERE. LOW TEMPS WILL BE SEASONABLY COOL. TUESDAY...CYCLOGENESIS LOOKS TO BE THE ORDER OF THE DAY...AS RAPID UPR LVL HT FALLS ACCOMPANY THE APPROACH OF THE VIGOROUS EPAC SW. UPR JET PHASING...BEGINNING BY EARLY TO MID MORNING ON TUE...WILL GREATLY ACCELERATE CYCLOGENESIS TO OUR WEST...WITH FLOW FROM S TO SSW NEAR THE SFC VEERING TO SWRLY AT MID/UPR LVLS. SFC WARM TYPE FRONT/BOUNDARY IS CURRENTLY PROGGED TO FORM ALONG/NEAR OUR NRN BORDER REGION...AND LIFT SLOWLY...WITH THE DEVELOPING SFC LOW...TO THE N THRU THE DAY. WE WILL EFFECTIVELY BE IN THE WARM SECTOR THRU THE AFTERNOON AND PART OF THE EVENING. ATTM...IT LOOKS LIKE STORMS WILL INITIALLY DEVELOP OVER THE HIGHER TERRAIN OF SWRN TO WRN WY TUE AFTERNOON...OR EVEN ALONG SOME SPEED CONVERGENCE ASSOCIATED WITH THE INCREASED SRLY FLOW OUT AHEAD OF THE DEVELOPING LOW. SUBSEQUENT DEVELOPMENT TO THE NORTH WILL TAKE PLACE DURING THE DAY WITH A PERSISTENT AREA OF SHOWERS AND STORMS OCCURRING ALONG/NEAR THE FRONT/ BOUNDARY NEAR OR NORTH OF OUR BORDER. THIS AREA ALONG/NEAR THE BORDER WILL ALSO BE AN AREA TO WATCH FOR STRONGER STORMS...ESPECIALLY IF THE FRONT SAGS INTO OUR CWA. UNLIKE SUNDAY HOWEVER...THE BOUNDARY LAYER WILL NOT BE PARTICULARLY MOIST AND IT WILL NOT BE ALL THAT UNSTABLE EITHER...BUT THERE SILL BE SUFFICIENT MOISTURE/STEEPENING LAPSE RATES CLOSE TO OUR NW AND NRN BORDER AREAS TO ALLOW FOR SMALL POSSIBILITY OF STRONG TO MARGINALLY SEVERE STORMS BY TUESDAY AFTERNOON IN THIS AREA. ALL WILL DEPEND ON THE FINAL POSITIONING OF THE THREE DIMENSIONAL VIEW. WEDNESDAY AND BEYOND...STRONG UPR TROF PLOWS THROUGH THE STATE...SIGNIFICANTLY DROPPING UPR LVL TEMPS AND DRAGGING SFC FRONT THRU THE FA...LEAVING COOL AND MOSTLY STABLE CONDITIONS BEHIND WITH LITTLE PRECIPITATION CHANCES EXCEPT THE EXTREME NW REGION WHICH STILL BE UNDER THE GREATEST VORT ADV DURING THE DAY AND IS ALSO NEAREST THE JET EXIT REGION...AND MAY ALSO BE SUBJECT TO A SECONDARY FRONTAL PUSH IN FROM THE NW. THURSDAY... RIDGING BEGINS AGAIN...WITH MORE MID TO UPR DRYING IN W TO NW FLOW. INDICATIONS ARE THAT UPR RIDGING...LITTLE IN THE WAY OF DISTURBANCES...AND NO TAP INTO ANY MONSOONAL MOISTURE...WILL KEEP THE FA MOSTLY PRECIP FREE THROUGH SATURDAY...DEPENDING ON THE TIMING AND ARRIVAL OF THE NEXT SW TROF FROM THE EPAC...WHICH THERE ARE SOME MARGINALLY SIGNIFICANT DIFFERENCES IN THE LRMS BY THIS TIME. ONE THING THAT THE LRMS DO SEEM TO AGREE ON IN THIS TIME PERIOD IS THE AMPLITUDE OF THE SYSTEM...MORE OR LESS BRUSHING OUR NW OR NRN BORDER AREA...SO THIS WILL BE THE REGION FOR INCREASED CHANCES IN DAY 7. SNOW MAY BE A POSSIBILITY SUNDAY NIGHT INTO MONDAY MORNING...NW MOUNTAINS IF CURRENT TRENDS HOLD. && .AVIATION.../00Z ISSUANCE/ AN UPPER LEVEL HIGH PRESSURE CENTER OVER MONTANA WITH AN UPPER LEVEL LOW PRESSURE CENTER OVER NORTHWEST COLORADO PRODUCING MOIST SOUTHEAST FLOW ALOFT WILL CONTINUE TO SPREAD MOISTURE OVER SOUTHERN AND CENTRAL WYOMING AND UP ALONG THE CONTINENTAL DIVIDE THIS EVENING WITH SHOWERS AND ISOLATED THUNDERSTORMS OVER CENTRAL AND SOUTHERN WYOMING AND THE MOUNTAINS WITH DECREASING SHOWERS TO THE WEST AWAY FROM THE CONTINENTAL DIVIDE. AREAS OF MVFR TO IFR CEILINGS WILL OCCUR ASSOCIATED WITH THE PRECIPITATION. COOLER AND MORE STABLE AIR WILL BE OVER THE NORTH WITH CLEARING. AFTER 09Z MONDAY... WITH CLEARING AREAS OF FOG WILL DEVELOP IN THE NORTHERN AND CENTRAL BASINS AND WESTERN VALLEYS WITH LOCAL MVFR TO IFR CEILINGS AND VISIBILITIES THROUGH 18Z MONDAY. A HIGH PRESSURE RIDGE OVER THE WESTERN GREAT BASIN WILL MOVE RAPIDLY EAST AND BUILD NORTH BRINGING DRY SOUTHWEST FLOW ALOFT TOWARDS SUNRISE MONDAY. THE SOUTHWEST FLOW ALOFT WILL INCREASE ACROSS THE AREA THROUGH THE DAY. WITH HEATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL DEVELOP MONDAY AFTERNOON OVER THE WESTERN MOUNTAINS ALONG AND WEST OF THE CONTINENTAL DIVIDE. EAST OF THE MOUNTAINS CONDITIONS SHOULD BE DRY WITH VFR CONDITIONS. && .FIRE WEATHER... AN UPPER LEVEL HIGH PRESSURE CENTER OVER MONTANA WITH AN UPPER LEVEL LOW PRESSURE CENTER OVER NORTHWEST COLORADO PRODUCING MOIST SOUTHEAST FLOW ALOFT WILL CONTINUE TO SPREAD MOISTURE OVER SOUTHERN AND CENTRAL WYOMING AND UP ALONG THE CONTINENTAL DIVIDE THIS EVENING WITH SHOWERS AND ISOLATED THUNDERSTORMS OVER CENTRAL AND SOUTHERN WYOMING AND THE MOUNTAINS WITH DECREASING SHOWERS TO THE WEST AWAY FROM THE CONTINENTAL DIVIDE. COOLER AND MORE STABLE AIR WILL BE OVER THE NORTH WITH CLEARING. A HIGH PRESSURE RIDGE OVER THE WESTERN GREAT BASIN WILL MOVE RAPIDLY EAST AND BUILD NORTH BRINGING DRY SOUTHWEST FLOW ALOFT TOWARDS SUNRISE MONDAY. THE SOUTHWEST FLOW ALOFT WILL INCREASE ACROSS THE AREA THROUGH THE DAY. WITH HEATING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL DEVELOP MONDAY AFTERNOON OVER THE WESTERN MOUNTAINS ALONG AND WEST OF THE CONTINENTAL DIVIDE. EAST OF THE MOUNTAINS CONDITIONS SHOULD BE DRY. TEMPERATURES WILL WARM AND RELATIVE HUMIDITY WILL DROP AS THE SOUTHWEST FLOW INCREASES OVER THE AREA. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...C.BAKER LONG TERM...BRAUN AVIATION...C.BAKER FIRE WEATHER...C.BAKER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 400 AM MDT SUN SEP 15 2013 WYZ001>020-022>030-161200- 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 SUN SEP 15 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT THE POTENTIAL FOR LOCALLY HEAVY RAIN EXISTS TODAY AS SHOWERS AND THUNDERSTORMS OCCUR OVER THE REGION. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ISOLATED THUNDERSTORMS WILL OCCUR IN THE WESTERN MOUNTAINS MONDAY AND TUESDAY MAINLY DURING THE AFTERNOON AND EVENING. SLIGHT CHANCE OF THUNDERSTORMS WEDNESDAY AS A COLD FRONT MOVES THROUGH THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY RAPIDLY RISING CREEKS OR STREAMS...AS WELL AS ANY FLOODING...INCLUDING MUDSLIDES. THANK YOU. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 215 PM MDT SUN SEP 15 2013 WYZ016>019-152200- GREEN MOUNTAINS AND RATTLESNAKE RANGE-LANDER FOOTHILLS- UPPER WIND RIVER BASIN-WIND RIVER BASIN- 215 PM MDT SUN SEP 15 2013 LIGHT RAIN IS CONTINUING TO MOVE FROM SOUTHEAST TO NORTHWEST AT AROUND 15 MPH ACROSS THE WIND RIVER BASIN AND INTO THE EAST SLOPES OF THE WIND RIVER MOUNTAINS AND SOUTHERN ABSAROKA MOUNTAINS. POCKETS OF MODERATE RAIN AND OCCASIONAL LIGHTNING HAVE ALSO BEEN OBSERVED IN PLACES. ISOLATED RAINFALL AMOUNTS FROM A TENTH OF AN INCH TO A QUARTER OF AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 400 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. WYZ028>030-152200- EAST SWEETWATER COUNTY-FLAMING GORGE-ROCK SPRINGS AND GREEN RIVER- 215 PM MDT SUN SEP 15 2013 ISOLATED SHOWERS AND THUNDERSTORMS ARE DEVELOPING AND MOVING FROM SOUTHEAST TO NORTHWEST THIS AFTERNOON ACROSS SWEETWATER COUNTY AT AROUND 15 MPH. POCKETS OF MODERATE RAIN...SMALL HAIL AND OCCASIONAL LIGHTNING HAVE BEEN OBSERVED IN PLACES. ISOLATED RAINFALL AMOUNTS FROM A TENTH OF AN INCH TO A QUARTER OF AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 400 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. JFB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 225 PM MDT SUN SEP 15 2013 WYZ016>019-152200- GREEN MOUNTAINS AND RATTLESNAKE RANGE-LANDER FOOTHILLS- UPPER WIND RIVER BASIN-WIND RIVER BASIN- 225 PM MDT SUN SEP 15 2013 LIGHT RAIN IS CONTINUING TO MOVE FROM SOUTHEAST TO NORTHWEST AT AROUND 15 MPH ACROSS THE WIND RIVER BASIN AND INTO THE EAST SLOPES OF THE WIND RIVER MOUNTAINS AND SOUTHERN ABSAROKA MOUNTAINS. POCKETS OF MODERATE RAIN...SMALL HAIL AND OCCASIONAL LIGHTNING HAVE ALSO BEEN OBSERVED IN PLACES. ISOLATED RAINFALL AMOUNTS FROM A TENTH OF AN INCH TO A QUARTER OF AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 400 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. WYZ028>030-152200- EAST SWEETWATER COUNTY-FLAMING GORGE-ROCK SPRINGS AND GREEN RIVER- 225 PM MDT SUN SEP 15 2013 ISOLATED SHOWERS AND THUNDERSTORMS ARE DEVELOPING AND MOVING FROM SOUTHEAST TO NORTHWEST THIS AFTERNOON ACROSS SWEETWATER COUNTY AT AROUND 15 MPH. POCKETS OF MODERATE RAIN...SMALL HAIL AND OCCASIONAL LIGHTNING HAVE BEEN OBSERVED IN PLACES. ISOLATED RAINFALL AMOUNTS FROM A TENTH OF AN INCH TO A QUARTER OF AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 400 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. JFB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 236 PM MDT SUN SEP 15 2013 WYZ019-030-152130- EAST SWEETWATER COUNTY WY-GREEN MOUNTAINS AND RATTLESNAKE RANGE WY- 236 PM MDT SUN SEP 15 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SWEETWATER COUNTY UNTIL 330 PM MDT... AT 230 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHEAST OF SUPERIOR TO I80 EXIT 142...AND MOVING NORTH TO NORTHWEST AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THESE STORMS... ALONG WITH HEAVY RAIN. THESE STORMS WILL BE NEAR... RURAL CENTRAL SWEETWATER COUNTY THROUGH 330 PM MDT THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 138 AND 144. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4220 10908 4202 10812 4159 10856 4183 10912 TIME...MOT...LOC 2036Z 175DEG 12KT 4185 10892 4170 10858 BRAUN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 302 PM MDT SUN SEP 15 2013 WYZ017>019-152200- GREEN MOUNTAINS AND RATTLESNAKE RANGE WY-LANDER FOOTHILLS WY-WIND RIVER BASIN WY- 302 PM MDT SUN SEP 15 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FREMONT COUNTY UNTIL 400 PM MDT... AT 258 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM ARAPAHOE TO STATE HWY 135 MILE MARKER 10...AND MOVING NORTHWEST AT 5 MPH. HAIL UP TO ONE-QUARTER INCH IN DIAMETER IS EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN. THESE STORMS WILL BE NEAR... GAS HILLS RD MILE MARKER 10 AROUND 335 PM MDT. ARAPAHOE AROUND 345 PM MDT. ST. STEPHENS...FREMONT COUNTY FAIRGROUNDS...U.S. HWY 26 MILE MARKER 130 AND RIVERTON AROUND 400 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. BRIEF HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4318 10889 4315 10812 4278 10804 4282 10885 TIME...MOT...LOC 2102Z 133DEG 6KT 4296 10854 4287 10825 BRAUN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 330 PM MDT SUN SEP 15 2013 WYZ028>030-152300- EAST SWEETWATER COUNTY-FLAMING GORGE-ROCK SPRINGS AND GREEN RIVER- 330 PM MDT SUN SEP 15 2013 SHOWERS AND THUNDERSTORMS ARE DEVELOPING AND MOVING FROM SOUTHEAST TO NORTHWEST THIS AFTERNOON ACROSS SWEETWATER COUNTY AT 10 TO 15 MPH. POCKETS OF HEAVY RAIN...SMALL HAIL AND OCCASIONAL LIGHTNING HAVE BEEN OBSERVED IN PLACES. ISOLATED RAINFALL AMOUNTS FROM A HALF TO THREE QUARTERS OF AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 500 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. JFB
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 355 PM MDT SUN SEP 15 2013 WYZ015>018-152300- LANDER FOOTHILLS-UPPER WIND RIVER BASIN-WIND RIVER BASIN- WIND RIVER MOUNTAINS EAST- 355 PM MDT SUN SEP 15 2013 LIGHT TO MODERATE RAIN IS CONTINUING TO MOVE FROM SOUTHEAST TO NORTHWEST AT AROUND 15 MPH ACROSS THE WIND RIVER BASIN AND INTO THE EAST SLOPES OF THE WIND RIVER MOUNTAINS AND SOUTHERN ABSAROKA MOUNTAINS. POCKETS OF ISOLATED HEAVY RAIN...SMALL HAIL AND OCCASIONAL LIGHTNING HAVE ALSO BEEN OBSERVED IN PLACES. LOCALIZED RAINFALL AMOUNTS FROM A HALF OF AN INCH TO AN INCH MAY OCCUR FROM THIS ACTIVITY THROUGH 500 PM. AREAS OF STANDING WATER MAY OCCUR DUE TO THE RECENT RAINS AND SATURATED SOILS. MOTORISTS SHOULD EXERCISE CAUTION ON AREA ROADS. JFB
The Riverton/Lander radar (KRIW), 166 km away, was scanning. The volume nearest the first event began at 23:11 UTC.
1 tornado. Local standard time, as filed.
The public posted a picture of a tornado off of Blue Rim Road, approximately 18 miles southwest of Eden. Other public reports were received of seeing the tornado from near Seedskadee and Eden. The tornado remained over open country and caused no damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2013Every state in 2013This day in weather historyThe tornado archive for Wyoming, 2013Warnings in Wyoming, September 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: 469337.