1 thunderstorm wind, as filed by the National Weather Service.
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 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 Sep 21, 2:50 AM MST, 9 hours 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 350 AM MDT WED SEP 21 2005 .SHORT TERM...TODAY THROUGH THU NIGHT...WATER VAPOR AND INFRARED SATELLITE IMAGERY SHOW INCREASING HIGH AND MID LEVEL MOISTURE OVER THE FORECAST AREA WELL AHEAD OF A WEAKENING UPPER LOW CURRENTLY LOCATED OVER CENTRAL CA. THE LOW WILL CONTINUE WEAKENING TODAY AS IT SHEARS NORTHEASTWARD OVER THE GREAT BASIN REGION. THE FEATURE WILL WEAKEN TO A WEAK RIPPLE TONIGHT AS IT PASSES OVER WY. GFS IS STRONGER THAN THE NAM WITH THE FEATURE. FLOW ALOFT WILL THEN GRADUALLY BACK TO SOUTHWESTERLY THU INTO THU NIGHT IN RESPONSE TO A DIGGING TROUGH APPROACHING THE PACIFIC NORTHWEST. MODELS PROG MOISTURE TO INCREASE TODAY WITH A COLD FRONT TO PUSH THROUGH MUCH OF THE FORECAST AREA THIS AFTERNOON. CHANCE OF SHOWERS AND THUNDERSTORMS WILL INCREASE THIS AFTERNOON...WHICH IS WELCOME CONSIDERING CHEYENNE HAS RECORDED ONLY A TRACE ALL MONTH. TEMPERATURES TODAY WILL STILL REACH THE MID 70S TO MID 80S OUTSIDE THE MOUNTAINS...WHICH IS WELL ABOVE NORMAL. LOW LEVEL MOISTURE WILL INCREASE POSTFRONTALLY WITH SURFACE BASED UPSLOPE WINDS DEVELOPING. BEST CHANCE OF RAIN IS TONIGHT CONSIDERING THE COMBINATION OF THE AFOREMENTIONED SHORTWAVE DISTURBANCE AND THE MOIST POSTFRONTAL UPSLOPE FLOW BEING OVERRUN BY MOIST SOUTHWESTERLY FLOW. THU WILL BE REFRESHINGLY COOLER AND SHOULD BE DRY ALTHOUGH THERE WILL BE A FAIR AMOUNT OF MID LEVEL MOISTURE OVER THE AREA. .LONG TERM...MOST OF THE CWA WILL BE UNDER SW FLOW ALOFT AND BETWEEN SYSTEMS ON FRI. HOWEVER...WITH BOTH NAM AND GFS SHOWING SOME QPF OVER NORTHERN AND WESTERN AREAS...WILL INCLUDE A LOW POP FOR A FEW AFTERNOON/EVENING SHOWERS AND TSTMS ROUGHLY FROM RWL TO DGW TO AIA. NAM ACTUALLY HAS QUITE A BIT OF INSTABILITY RETURNING TO NEBRASKA PANHANDLE. APPROACHING UPPER TROUGH FOR WEEKEND WILL DO THE SPLITS WITH UPPER LOW FORMING OFF CA COAST AND THE WEAKER NORTHERN STREAM TROUGH GOING ACROSS NORTHERN WY INTO THE DAKOTAS ON SATURDAY. DECENT COLD FRONT PASSAGE FRI EVENING WITH UPSLOPE FLOW BRINGING SOME SHOWERS FROM FRI NIGHT THROUGH SATURDAY NIGHT MAINLY OVER NORTHERN AND EASTERN AREAS. IT DOES APPEAR THAT THE SHOWERS WILL DECREASE FASTER ON SUNDAY THOUGH IT WILL REMAIN COOL. UPPER RIDGE BUILDING IN FOR MONDAY PROMISES A DRY AND WARMER DAY THAN EARLIER EXPECTED. NEXT UPPER TROUGH MOVING IN ALONG WITH AN ACCOMPANYING PACIFIC COLD FRONT FOR TUESDAY. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1026 AM MDT WED SEP 21 2005 NEZ001>003-019>021-054-055-WYZ059>070-221630- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON- SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 1026 AM MDT WED SEP 21 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT A SCATTERED COVERAGE OF SHOWERS AND THUNDERSTORMS WILL SPREAD OVER THE REGION FROM WEST TO EAST THIS AFTERNOON AND EVENING. ANY STORMS WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH AND A PERIOD OF MODERATE RAINFALL. THE STRONGER ACTIVITY WILL ALSO PRODUCE SMALL HAIL AS WELL AS DANGEROUS LIGHTNING. SOME THUNDERSTORMS WILL LINGER THROUGH THE EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A FEW LATE DAY THUNDERSTORMS ARE POSSIBLE FRIDAY. COOLER TEMPERATURES AND SCATTERED SHOWERS WILL PREVAIL SATURDAY AND SUNDAY WITH THE SHOWERS DECREASING SUNDAY AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. WEILAND
The Cheyenne radar (KCYS), 29 km away, was scanning. The volume nearest the first event began at 19:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm outflow winds from west to north of Cheyenne, WY.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2005Every state in 2005This day in weather historyWarnings in Wyoming, September 2005
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: 5471579.