A severe thunderstorm over extreme eastern Cheyenne county produced a tornado and hail.
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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.
A severe thunderstorm over extreme eastern Cheyenne county produced a tornado and 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 Cheyenne, WY wrote its last area forecast discussion before the first event at May 27, 2:20 PM MST, 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 320 PM MDT SUN MAY 27 2007 .SHORT TERM...TONIGHT THROUGH TUESDAY...LOW LEVEL MOISTURE AND INSTABILITY HANGING TOUGH OVER FAR EASTERN PART OF CWA LATE THIS AFTERNOON WITH ONE GOOD TSTM NORTHEAST OF KSNY. ELSEWHERE... MUCH DRIER LOW LEVELS WITH ONLY SOME VIRGA OR SPRINKLES AROUND. HAVE PLAYED BOTH OF THESE TRENDS INTO JUST EARLY THIS EVENING. ON MEMORIAL DAY...STRONG UPPER TROUGH MOVES OUT OF PACIFIC NW INTO NORTHERN ROCKIES WITH NAM A BIT FASTER THAN GFS. COLD FRONT WILL MAKE ITS WAY INTO NW PART OF CWA MON MORNING...BUT NOT INTO REST OF THE CWA UNTIL LATE AFTERNOON/EVENING. DOWNSLOPE FLOW SETS UP OVER MUCH OF WY PART OF CWA WITH INCREASING FIRE DANGER POTENTIAL WEST OF I-25. MEANWHILE...INCREASING SE WINDS WILL HELP LOW LEVEL MOISTURE AND INSTABILITY OVER FAR EASTERN PART OF CWA TO FAR EAST CENTRAL WY. SPC DAY2 OUTLOOK LOOKS GOOD FOR THIS AREA AS RIGHT REAR QUAD OF UPPER JET WILL ALSO HELP THINGS OUT BY EVENING. HAVE BOOSTED POPS A BIT OVER EAST CENTRAL WY AND NORTHERN PANHANDLE MONDAY EVENING. GRADUALLY IMPROVING CONDITIONS OVERNIGHT MONDAY BUT DID KEEP A FEW SHOWERS ALL NIGHT. GFS LOOKS TOO SLOW IN KEEPING UPPER LOW OVER MT/ND BORDER AND THUS IN DRYING THINGS OUT. TUESDAY WILL BE COOLER WITH JUST A FEW SHOWERS OR WEAK THUNDERSTORMS MAINLY OVER EAST CENTRAL WY. .LONG TERM...TUE NIGHT THROUGH SUNDAY. CYCLONIC UPPER FLOW WILL LINGER TUE NIGHT INTO WED. GFS PROGS THE CUTOFF TO SIT AND SPIN OVER WESTERN ND TUE NIGHT INTO WED...WHICH SEEMS IMPROBABLE. THE FASTER ECMWF/DGEX/NOGAPS SOLUTIONS SEEM MORE REASONABLE AND ARE PREFERRED. FLOW ALOFT WILL BECOME NORTHERLY WED THEN BEGIN BACKIMG SLIGHTLY TO NORTH NORTHWESTERLY THU. FLOW WILL BACK FURTHER TO NORTHWESTERLY FRI AND REMAIN FROM THE NORTHWEST THROUGH SUN AS AN AMPLIFIED UPPER RIDGE APPROACHES FROM THE WEST. SHOWERS AND THUNDERSTORMS WILL LINGER OVER THE EASTERN PART OF THE FORECAST AREA TUE NIGHT...WITH A CHANCE OF RAIN WED MAINLY IN AND NEAR THE MOUNTAINS IN ADDITION TO OVER NORTHERN PORTIONS OF THE FORECAST AREA. WED WILL BE A FEW DEGREES WARMER THEN THU WILL CONTINUE THE WARMING TREND AS LOW LEVEL DOWNSLOPE FLOW PRODUCES ADIABATIC WARMING AND DRY CONDITIONS. FRI AND SAT WILL BE DRY AND MILDER STILL WITH LITTLE CHANGE IN SURFACE CONDITIONS. MOISTURE WILL BEGIN TO INCREASE LATE SAT AND SOME STORMS WILL BE POSSIBLE SAT EVENING AND NIGHT. SUN WILL BE WARMER THAN NORMAL WITH A CHANCE OF RAIN. && .AVIATION...VFR CONDITIONS EXPECTED TONIGHT AND MONDAY THOUGH LOCAL MVFR CEILINGS/VSBYS POSSIBLE NEAR TSTMS MON AFTERNOON AND EVENING. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION...JLH LONG TERM...JR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1102 AM MDT SUN MAY 27 2007 WYZ059>070-281715- CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON-SNOWY RANGE- NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE-PLATTE-GOSHEN- CHEYENNE FOOTHILLS-PINE BLUFFS- 1102 AM MDT SUN MAY 27 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON AND CONTINUE INTO EARLY THIS EVENING WHILE MOVING EAST AT 20 MPH. WHILE NO SEVERE WEATHER IS EXPECTED...BRIEF WIND GUSTS TO 40 MPH CAN BE EXPECTED NEAR THE STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED THUNDERSTORMS ARE EXPECTED MONDAY AFTERNOON AND EVENING. THERE WILL BE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS TUESDAY THROUGH THURSDAY. WARM AND WINDY CONDITIONS MONDAY AFTERNOON WILL INCREASE FIRE DANGER CONCERNS AT LOWER ELEVATIONS OF CARBON AND ALBANY COUNTIES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ001>003-019>021-054-055-281715- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE- 1102 AM MDT SUN MAY 27 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TODAY AND TONIGHT SOME THUNDERSTORMS WILL DEVELOP AROUND MID AFTERNOON AND CONTINUE THROUGH THIS EVENING. THE AIR MASS WILL BE MOIST AND UNSTABLE ENOUGH TO SUPPORT A FEW STRONG STORMS MAINLY OVER DAWES...BOX BUTTE ...MORRILL AND CHEYENNE COUNTIES. HAIL AND GUSTY WINDS OVER 50 MPH WILL BE THE MAIN WEATHER THREATS FROM THE STRONGER THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED THUNDERSTORMS ARE EXPECTED AGAIN LATE MONDAY AFTERNOON AND MONDAY NIGHT...WITH A FEW POSSIBLY BECOMING STRONG OVER THE NORTHERN AND EASTERN PARTS OF THE PANHANDLE. THERE WILL BE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS TUESDAY THROUGH THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON AND EVENING IN THE AREA BETWEEN CHADRON AND SIDNEY. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE JLH
The Cheyenne radar (KCYS), 181 km away, was scanning. The volume nearest the first event began at 21:35 UTC.
1 tornado, 1 hail. Local standard time, as filed.
Short-lived tornado partially damaged a steel building.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2007Every state in 2007This day in weather historyThe tornado archive for Nebraska, 2007Warnings in Nebraska, May 2007
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: 23634, 23633.