Collapsing showers northwest of Elk Mountain produced brief wind gusts of 50 to 60 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 CYS wrote it up.
Collapsing showers northwest of Elk Mountain produced brief wind gusts of 50 to 60 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 Cheyenne, WY wrote its last area forecast discussion before the first event at May 22, 7:10 PM MST, 1 hour 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 810 PM MDT WED MAY 22 2013 .UPDATE... ISSUED AT 810 PM MDT WED MAY 22 2013 ISOLATED SHOWERS LINGER EARLY THIS EVENING TO THE WEST OF THE LARAMIE RANGE. THERE WERE A FEW LIGHTNING STRIKES IN THAT AREA SEVERAL HOURS AGO...BUT HAVE SINCE ENDED. A TIGHT SOUTHEAST SURFACE PRESSURE GRADIENT OVER SOUTHEAST WYOMING TONIGHT WILL PRODUCE GUSTS AS HIGH AS 40 MPH. PERHAPS THE BIGGEST QUESTION LATER TONIGHT WILL CONTINUE TO BE THE TIMING OF THE WESTWARD SPREAD OF THE LOWER CLOUDS TO OVER THE LARAMIE RANGE. THE EXPECTED WINDS AND SURFACE PRESSURE GRADIENT MAY CREATE ENOUGH MIXING TO LIMIT THE VISIBILITY REDUCTION IN FOG SOME. THE CLOUDS AND FOG SHOULD MOVE TO OVER THE LARAMIE RANGE BETWEEN 06Z AND 09Z. THE FOG WILL LIKELY BE DENSE AT TIMES OVER THE SOUTHERN LARAMIE RANGE STARTING AFTER 09Z. AREAS OF DRIZZLE WILL ALSO BE POSSIBLE OVER THE EAST PART OF THE CWA LATER TONIGHT AS THE CLOUD DEPTH DEEPENS. THE CLOUDS AND FOG WILL BE SLOW TO LIFT ON THURSDAY...WITH CLOUD COVER OVER THE EAST PART OF THE CWA LASTING FOR MUCH OF THE DAY. HAVE MADE MINOR FIRST PERIOD ADJUSTMENTS IN A RECRNY UPDATE. && .SHORT TERM...(THIS EVENING THROUGH THURSDAY) ISSUED AT 233 PM MDT WED MAY 22 2013 A FEW SHOWERS HAVE DEVELOPED THIS AFTERNOON ACROSS ALBANY AND CARBON COUNTIES. ISOLATED SHOWER ACTIVITY WILL CONTINUE INTO EARLY THIS EVENING BEFORE DYING OFF. SHOWERS WILL TRY TO PUSH EASTWARD AND COULD REACH THE NEBRASKA BORDER BY THIS EVENING...BUT THAT MAY BE PUSHING THE EASTERN EXTENT OF ANY ACTIVITY AS A LOW LEVEL INVERSION WILL BE STRENGTHENING THIS EVENING AS COOL MOIST LOW LEVEL AIR ADVECTS WESTWARD. SHOWER ACTIVITY COULD BE ACCOMPANIED BY A FEW WEAK THUNDERSTORMS...BUT THOSE WILL BE FEW AND FAR BETWEEN. SEVERE THUNDERSTORMS NOT EXPECTED BUT COULD SEE A FEW STRONGER WIND GUSTS GIVEN 30 TO 40 DEGREE SURFACE DEW POINT DEPRESSIONS. THERE IS A VERY SMALL CHANCE FOR ELEVATED SHOWERS TO SPREAD EAST ACROSS THE PANHANDLE THIS EVENING IN ASSOCIATION WITH AN ELEVATED WARM FRONT. NOT A LOT OF MOISTURE TO WORK WITH SO KEPT POPS BELOW MENTION IN THE FORECAST BUT SOMETHING TO KEEP AN EYE ON THIS EVENING. STRATUS DECK HAS HELD FIRM ALL DAY AT CHADRON AND ALLIANCE. THE STRATUS WILL WORK ITS WAY WEST THIS EVENING...BANKING UP ALONG THE LARAMIE RANGE. SOME OF THE LOW CLOUDS MAY SPILL INTO THE LARAMIE VALLEY. FOG WILL BE POSSIBLE ACROSS THE NEBRASKA PANHANDLE AND PORTIONS OF SOUTHEAST WYOMING...ESPECIALLY ALONG THE LARAMIE RANGE WHERE LOCALLY DENSE FOG MAY FORM TONIGHT. SOUTHEAST WINDS WILL RATCHET UPWARD TONIGHT WITH SOME OF THE STRONGEST WINDS EAST OF THE LARAMIE RANGE. COULD EASILY SEE SOME GUSTS OVER 40 MPH TONIGHT SUCH AS AROUND DOUGLAS. WITH THE STRATUS DECK HOLDING FIRM THURSDAY UNDER SOUTHEAST FLOW...TEMPERATURES WILL STRUGGLE TO RISE ANYWHERE EAST OF THE LARAMIE RANGE...WHILE MOSTLY SUNNY AND WARM TEMPERATURES WILL BE FOUND IN THE WEST UNDER SOUTHWEST FLOW. CUT BACK ON CHANCES OF THUNDERSTORMS EAST OF THE LARAMIE RANGE WITH ISOLATED SHOWERS AND THUNDERSTORMS WEST. CHANCES FOR THUNDERSTORMS ALONG THE LARAMIE RANGE ARE DIFFICULT TO HANDICAP...DEPENDING ON WHETHER OR NOT LOW CLOUDS MIX OUT. CERTAINLY A CONVERGENCE ZONE WITH SOUTHWEST WINDS MEETING SOUTHEAST WINDS...SO SHOULD CAP WEAKEN...A FEW STORMS WOULD BE POSSIBLE. NOT EXPECTING SEVERE THUNDERSTORMS...BUT WITH CAPE AND SHEAR WOULD BE SUPPORTIVE OF A FEW STRONGER THUNDERSTORMS. STATUS SHOULD STAY LOCKED IN OVER THE AREA INTO THURSDAY EVENING...BUT THE MODELS ARE BRINGING IN A STRONG PUNCH OF DRY SOUTHWEST FLOW ALOFT THURSDAY NIGHT AND FRIDAY. STRATUS SHOULD ERODE FROM WEST TO EAST DURING THIS TIME. THIS WILL MEAN MUCH WARMER TEMPERATURES FRIDAY FOR PLACES SUCH AS CHEYENNE AND DOUGLAS. THE MAIN QUESTION IS HOW FAR EAST WILL THE DRY AIR MAKE IT. A LARGE TEMPERATURE DIFFERENCE CAN BE EXPECTED OVER A SHORT DISTANCE COME THURSDAY AFTERNOON...BUT WHERE THAT LINE SETS UP IS THE MAIN QUESTION. CHANCES FOR THUNDERSTORMS WILL EXIST ALONG AND EAST OF THE DRY LINE FRIDAY AFTERNOON. SHEAR AND CAPE PROFILES CONDUCIVE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL WITH TORNADOES NOT OUT OF THE QUESTION. FOR FRIDAY EVENING...THE DRY LINE IS EXPECTED TO RETREAT WESTWARD. STORMS VERY WELL MAY FIRE ALONG THE RETREATING DRY LINE. .LONG TERM...(SATURDAY THROUGH WEDNESDAY) ISSUED AT 310 PM MDT WED MAY 22 2013 WARMER AND MAINLY DRY CONDITIONS EXPECTED SATURDAY IN SWLY FLOW WITH SFC BOUNDARY EXPECTED TO BE NORTHEAST OF THE CWA...THOUGH NOT FAR. PATTERN THEN REMAINS QUITE SIMILAR SUNDAY THROUGH WEDNESDAY WITH SW FLOW ALOFT OVER THE CWA AHEAD OF AN UPPER TROF THAT WILL HOLD OVER THE PACIFIC NW. PERIODIC UPPER SHORTWAVE WILL PASS ACROSS THE REGION AND BRING SOME AFTERNOON AND EVENING CONVECTION BUT HARD TO SAY WHICH DAYS WILL BE BEST FOR THIS. RIGHT NOW MONDAY AND TUESDAY LOOKING SOMEWHAT BETTER. TEMPERATURES WILL REMAIN WARM THROUGH THE PERIOD. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z THURSDAY AFTERNOON) ISSUED AT 606 PM MDT WED MAY 22 2013 THROUGH 06Z...ISOLATED SHOWERS AND THUNDERSTORMS MAINLY WEST OF A DOUGLAS TO CHEYENNE LINE. AFTER 03Z...WIDESPREAD IFR AND LIFR LOW CLOUDS AND FOG SPREADING EAST TO WEST AT ALL TAF SITES EXCEPT AT RAWLINS. CEILINGS AND VISIBILITIES IMPROVING TO VFR AFTER 15Z THURSDAY. && .FIRE WEATHER... ISSUED AT 233 PM MDT WED MAY 22 2013 LOW CLOUDS AND FOG TO SPREAD ACROSS THE NEBRASKA PANHANDLE AND SOUTHEAST WYOMING EAST ALONG AND EAST OF THE LARAMIE RANGE TONIGHT. WHILE THE FOG WILL BURN OFF THURSDAY BUT LOW CLOUDS AND COOL DAMP CONDITIONS WILL PERSIST. WEST OF THE LARAMIE RANGE IT WILL BE DRY AND WARM UNDER SOUTHWEST FLOW ALOFT. FOR FRIDAY...DRY CONDITIONS ARE EXPECTED TO SHIFT EAST ACROSS THE REMAINDER OF WYOMING ALONG WITH MUCH WARMER TEMPERATURES. THUNDERSTORMS ARE POSSIBLE OVER THE NEBRASKA PANHANDLE FRIDAY AFTERNOON AND EVENING. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && UPDATE...WEILAND SHORT TERM...LIEBL LONG TERM...RE AVIATION...RUBIN FIRE WEATHER...LIEBL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 751 PM MDT WED MAY 22 2013 WYZ101>119-231045- CONVERSE COUNTY LOWER ELEVATIONS-NIOBRARA COUNTY- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY- SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 751 PM MDT WED MAY 22 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TONIGHT FOG WILL DEVELOP TONIGHT ACROSS SOUTHEAST WYOMING WITH LOCALLY DENSE FOG POSSIBLE...ESPECIALLY ALONG THE LARAMIE RANGE. SOUTHEAST WINDS WILL GUST AS HIGH AS 40 MPH IN THE LARAMIE VALLEY AND THE DOUGLAS AREA TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY FOG WILL CONTINUE THROUGH LATE MORNING THURSDAY AND WILL BE LOCALLY DENSE ESPECIALLY ALONG AND JUST EAST OF THE LARAMIE RANGE. SOUTHEAST WINDS WILL GUST AS HIGH AS 45 MPH OVER MUCH OF SOUTHEAST WYOMING ON THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-003-019>021-054-055-095-096-231045- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 751 PM MDT WED MAY 22 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TONIGHT FOG WILL DEVELOP TONIGHT ACROSS THE WESTERN NEBRASKA PANHANDLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY FOG WILL CONTINUE THROUGH LATE MORNING THURSDAY. SOUTHEAST WINDS WILL GUST AS HIGH AS 40 MPH OVER MUCH OF THE WESTERN NEBRASKA PANHANDLE THURSDAY AND THURSDAY NIGHT. THERE WILL BE A CHANCE OF THUNDERSTORMS EACH AFTERNOON AND EVENING FROM FRIDAY THROUGH THE WEEKEND. SOME STRONG STORMS LOOK TO BE POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WEILAND
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
A WYDOT wind sensor three miles northwest of Interstate 80 exit 255 measured wind gusts of 60 mph.
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, May 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: 444227.