A strengthening thunderstorm on the southwest side of Casper Mountain spawned a landspout tornado near Jackson Canyon. The tornado lasted about ten minutes and was visible from all across Casper.
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 strengthening thunderstorm on the southwest side of Casper Mountain spawned a landspout tornado near Jackson Canyon. The tornado lasted about ten minutes and was visible from all across Casper.
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 May 23, 10:25 AM MST, 2 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 1125 AM MDT FRI MAY 23 2014 .SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT A FEW SHOWERS PERSIST OVER THE FORECAST AREA THIS MORNING...GENERALLY CONFINED TO FREMONT AND NORTHERN SWEETWATER COUNTIES. SHOWERS WILL CONTINUE THROUGH THE REMAINDER OF THE NIGHT...WITH ADDITIONAL SHOWER COVERAGE DEVELOPING THROUGH THE MORNING HOURS UNDER THE CONTINUED INFLUENCE OF THE AREA OF LOW PRESSURE. ANOTHER ROUND OF INSTABILITY WILL IMPACT THE STATE THIS AFTERNOON...WITH WIDESPREAD SHOWERS AND THUNDERSTORMS. THREATS OF HEAVY RAIN...GUSTY WIND...AND SMALL HAIL HAVE BEEN INCLUDED WITH STORM ACTIVITY THIS AFTERNOON. MODELS INDICATE THE BEST INSTABILITY WILL BE FOUND IN THE EARLY AFTERNOON...WITH ACTIVITY WEAKENING DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. SIMILAR TEMPERATURES ARE EXPECTED TODAY...THOUGH SLIGHTLY COOLER IN SOUTHERN WYOMING. THE AREA OF LOW PRESSURE WILL REMAIN OVER THE DESERT SOUTHWEST FOR SATURDAY...WITH ANOTHER PUSH OF MOISTURE AND ASSOCIATED SHOWERS AND THUNDERSTORMS. BY SUNDAY MORNING...THE AREA OF LOW PRESSURE IS LOOKING FAVORABLE TO BEGIN TO LIFT NORTHEAST INTO COLORADO. THIS WILL AGAIN CREATE SOME SHOWERS AND THUNDERSTORMS OVER THE AREA. THE PLACEMENT OF THE LOW IS ESPECIALLY FAVORABLE FOR STORM DEVELOPMENT OVER SWEETWATER AND NATRONA COUNTIES. MOISTURE WILL AGAIN WANE DURING THE EVENING AND OVERNIGHT HOURS. CONTINUED CLOUD COVER OVER THE AREA WILL LEAVE COOLING TEMPERATURES OVER THE FORECAST AREA...THOUGH VALUES IN THE MID TO UPPER 70S ARE STILL ANTICIPATED OVER THE CENTRAL AND NORTHERN BASINS. .LONG TERM...MONDAY THROUGH FRIDAY MEMORIAL DAY LOOKS TO BE WARM WITH ONLY ISOLATED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. THE WEATHER PATTERN FOR NEXT TUESDAY THROUGH FRIDAY WILL FEATURE A SOUTHWEST FLOW ALOFT. A NEW STORMS SYSTEM MOVES INTO THE PACIFIC NORTHWEST TUESDAY AND IT HANGS AROUND THERE THROUGH WEDNESDAY. THEN IT MIGRATES NORTHEAST INTO SOUTHWEST CANADA THURSDAY. AS THAT OCCURS MORE ENERGY DROPS SOUTH ALONG THE WEST COAST THURSDAY NIGHT AND FRIDAY...THUS KEEPING THE SW FLOW ALOFT OVER THE AREA. THE FORECAST CHALLENGE IN THIS SW FLOW ALOFT WILL BE WHERE CONVECTION WILL OCCUR EACH DAY. THERE WILL BE A DEWPOINT BOUNDARY THAT WILL TEND TO MOVE BACK AND FORTH EAST OF THE DIVIDE. NORMALLY THE NORTH AND NORTHEAST ZONES WILL HAVE THE HIGHER DEWPOINT TEMPS WHILE THE SOUTHWEST AND SOUTH WILL SEE THE LOWEST. THE CENTRAL ZONES WILL TEND TO DRY OUT DURING THE AFTERNOON AND EVENING. THEN THIS AREA USUALLY RECOVERS LATE EVENING OR OVERNIGHT FROM AN OUTFLOW BOUNDARY THAT PUSHES IN THE FROM THE NORTH OR EAST. ANOTHER FACTOR IS WEAK WEATHER DISTURBANCES MOVING THROUGH THE SW FLOW ALOFT WHICH COULD HELP AID CONVECTION DEVELOPMENT. THE FORECAST FROM NEXT TUE THROUGH FRI WILL HAVE A SLIGHT CHANCE OF AFTERNOON AND EVENING SHOWERS AND STORMS EACH DAY. LOOKS TO BE LESS COVERAGE IN THE SOUTH AND SOUTHWEST AND A LITTLE BETTER COVERAGE IN THE NORTH AND NORTHEAST ZONES. AS FOR TEMPS...THE GFS AND ECMWF ARE NOW QUITE WARM TUESDAY AND WEDNESDAY. THIS WILL INCREASE SNOWMELT AT THE HIGHER ELEVATIONS. THE ECMWF MODEL WISHES TO BRING A COLD FRONT THROUGH WED NIGHT LEADING TO A COOLER DAY THURSDAY. THE GFS DOES NOT HAVE THIS FRONT MOVING THROUGH AND THUS A WARM DAY ON THURSDAY. HAVE GONE WITH THE ECMWF AS HAVE MOST NEIGHBORS. THEN WARMING BACK UP FOR NEXT FRIDAY. && .AVIATION.../18Z ISSUANCE/ EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL ROUTES VFR CONDITIONS WILL PREVAIL THROUGH 18Z SATURDAY. A WEAK UPPER LEVEL DISTURBANCE WILL LIFT NORTH ACROSS EASTERN WYOMING THIS AFTERNOON. A LINE OF SHOWERS AND THUNDERSTORMS WILL MOVE INTO THE REGION FROM THE SOUTH OR SOUTHEAST IN THE EARLY AFTERNOON...GRADUALLY PUSHING FURTHER N TO NW THROUGH THE AFTERNOON AND EVENING. THE HEAVIEST LINE OF ACTIVITY WILL LIKELY OCCUR BETWEEN KRIW AND KCPR. BRIEF MVFR/IFR CONDITIONS IN HEAVY RAIN AND SMALL HAIL WILL BE POSSIBLE WITH STRONGER STORMS ALONG WITH OCCASIONAL WIND GUSTS 25 TO 40KT. A FEW LIGHT SHOWERS AND SOME MVFR CLOUDS WILL HANG AROUND THE MOUNTAINS THROUGH 06Z. WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS ROUTES VFR CONDITIONS WILL PREVAIL THROUGH THE PERIOD. A WEAK UPPER LEVEL DISTURBANCE WILL LIFT NORTH ACROSS THE REGION THIS AFTERNOON. SHOWER AND THUNDERSTORM ACTIVITY WILL MOVE INTO THE REGION FROM THE SOUTH...WITH THE HEAVIEST ACTIVITY LOCATED BETWEEN KRKS AND KPNA IN SCATTERED SHOWERS AND ISOLATED THUNDER. ELSEWHERE...SHOWER/THUNDER ACTIVITY WILL BE MORE ISOLATED. BRIEF MVFR/IFR CONDITIONS IN HEAVY RAIN AND SMALL HAIL MAY OCCUR WITH ISOLATED STRONGER STORMS IN THIS AREA. A FEW LIGHT SHOWERS AND SOME MVFR CLOUDS WILL HANG AROUND THE MOUNTAINS THROUGH 06Z. && .FIRE WEATHER... AFTERNOON SHOWERS AND THUNDERSTORMS WILL REMAIN PRESENT THROUGH THE WEEKEND...WITH TEMPERATURES TRENDING TO COOLER. CONSEQUENTLY DAYTIME HUMIDITY WILL INCREASE THROUGH THE WEEKEND. STORMS OVER THE AREA COULD RESULT IN GUSTY AND ERRATIC WIND. FRIDAY STORMS MAY BRING PERIODS OF HEAVY PRECIPITATION...WITH THE STRONGER STORMS ANTICIPATED TO OCCUR IN THE EARLY AFTERNOON HOURS. THE AREA OF LOW PRESSURE WILL BEGIN TO LIFT INTO COLORADO BY SUNDAY...WHICH MAY RESULT IN ADDITIONAL STORM COVERAGE ACROSS ZONES 279...289...280...AND 300. AGAIN...GUSTY WIND WILL BE THE PRIMARY THREAT. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...BRANHAM LONG TERM...AR AVIATION...JB FIRE WEATHER...BRANHAM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 400 AM MDT FRI MAY 23 2014 WYZ001>020-022>030-241200- 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 FRI MAY 23 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT AFTERNOON SHOWERS AND THUNDERSTORMS ARE ANTICIPATED ACROSS CENTRAL AND WESTERN WYOMING. SOME STORMS MAY CONTAIN HEAVY RAIN...SMALL HAIL...AND GUSTY WIND. HEAVY RAIN WILL RAISE CONCERNS WITH RISING RIVER LEVELS...ESPECIALLY AS STORMS DEVELOP OVER MOUNTAIN LOCATIONS. STORM ACTIVITY LOOKS TO DEVELOP QUICKLY DURING THE EARLY AFTERNOON HOURS...WITH STORMS WEAKENING THROUGH THE EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY SATURDAY...THUNDERSTORMS POSSIBLE CAPABLE OF PRODUCING STRONG GUSTY WINDS...SMALL HAIL AND OCCASIONAL HEAVY DOWNPOURS IN THE MOUNTAINS OVER RIPE SNOW PACK...KEEPING FLOOD CONCERNS ELEVATED. SUNDAY...A SLIGHT CHANCE OF THUNDERSTORMS EAST OF THE CONTINENTAL DIVIDE...ESPECIALLY OVER SWEETWATER AND NATRONA COUNTIES. MONDAY THROUGH WEDNESDAY...WARMER. ISOLATED THUNDERSTORMS EACH AFTERNOON AND EVENING. BREEZY TO WINDY TUESDAY AND WEDNESDAY WITH INCREASED FIRE DANGER FOR THE LOWER ELEVATIONS OF THE SOUTHWEST AND CENTRAL. .SPOTTER INFORMATION STATEMENT... SPOTTERS SHOULD REPORT ANY HAIL OR WIND GUSTS OF 40 MPH OR HIGHER...AS WELL AS ANY FLOODING AND RAINFALL AMOUNTS. THANK YOU. TEAM RIVERTON
The Riverton/Lander radar (KRIW), 171 km away, was scanning. The volume nearest the first event began at 19:36 UTC.
1 tornado. Local standard time, as filed.
A tornado on the southwest side of Casper Mountain in the vicinity of Jackson Canyon was seen and photographed by people from across Casper.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2014Every state in 2014This day in weather historyThe tornado archive for Wyoming, 2014Warnings in Wyoming, May 2014
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: 509256.