1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 Aug 14, 1:26 PM MST, 3 hours 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 226 PM MDT MON AUG 14 2006 .SHORT TERM...THROUGH WED. THE REGION WILL BE UNDERNEATH THE NORTHWESTERN EDGE OF A FLAT UPPER RIDGE TONIGHT THROUGH WED. FLOW ALOFT WILL BE FROM THE WEST TONIGHT BEFORE BACKING TUE. FLOW WILL REMAIN SOUTHWESTERLY TUE NIGHT AND WED. REGARDING SENSIBLE WEATHER...WILL KEEP POPS IN FOR THIS EVENING AS THE CONVECTIVE ACTIVITY CURRENTLY DEVELOPING OVER THE FORECAST AREA WILL KEEP GOING FOR AWHILE WITH MOIST SURFACE BASED UPSLOPE FLOW. A FEW OF THE STORMS THIS EVENING MAY BE MARGINALLY SEVERE WITH THE PRIMARY THREAT BEING HAIL. CONVECTION SHOULD DIMINISH LATE TONIGHT. LOW LEVEL UPSLOPE WILL CONTINUE TUE...BUT RISING HEIGHTS INDICATE A WARMER DAY WITH AFTERNOON TEMPERATURES REACHING THE 90S IN MOST AREAS EAST OF THE MOUNTAINS. WED WILL BE SIMILARLY WARM BUT WITH LESS MOISTURE IN THE AIRMASS. BEST CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS WED WILL BE IN AND NEAR THE MOUNTAINS AS OROGRAPHY ASSISTS PARCEL UPLIFT. .LONG TERM...THE SHORTWAVE TROUGH NOW AT ABOUT 45N AND 150W WILL CONTINUE TO DIG AS IT MOVES EAST. THE FEATURE WILL END UP OVER THE PACIFIC NORTHWEST WEDNESDAY NIGHT AND THEN FILLS AT IT HEADS OVER THE NORTHERN ROCKIES. MODELS ALL TIME THE SHORTWAVE TROUGH DIFFERENTLY AND THE INITIALLY DEEPER AND MORE PROGRESSIVE GFS IS PREFERED BY NCEP AND WILL BE USED MAINLY FOR THIS FORECAST. AS THE FEATURE FILLS AS IT MOVES OVER THE NORTHERN ROCKIES ON FRIDAY...IT WILL PUSH A COLD FRONT THROUGH THE CWA THURSDAY NIGHT AND EARLY FRIDAY MORNING. TEMPERATURES WILL BE JUST ABOVE NORMAL VALUES AHEAD OF THE FRONT ON WEDNESDAY NIGHT AND THURSDAY AND THEN COOL 4 TO 8 DEGREES FOR FRIDAY. HEIGHTS REBUILD OVER THE ROCKIES SATURDAY WITH THE RIDGE AXIS ALOFT OVER THE HIGH PLAINS BY NEXT MONDAY. TEMPERATURES WILL REBOUND TO AT OR JUST ABOVE NORMAL VALUES ON THOSE DAYS. THE MID AND UPPER LEVEL MOISTURE PLUME PER THE GFS AND DGEX RETURNS OVER MUCH OF THE CWA ON SATURDAY AND THEN PERSISTS THROUGH MONDAY. WILL INCREASE POPS A BIT FOR THOSE DAYS. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && JR/WEILAND
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1044 AM MDT MON AUG 14 2006 NEZ001>003-019>021-054-055-WYZ060-067>070-151200- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-NIOBRARA-PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 1044 AM MDT MON AUG 14 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING. A FEW OF THE STORMS WILL HAVE THE POTENTIAL TO BECOME SEVERE. THE PRIMARY THREATS WITH THE STORMS WILL BE WIND GUSTS TO 60 MPH IN ADDITION TO PENNY SIZED HAIL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY AT LEAST ISOLATED THUNDERSTORMS WILL BE POSSIBLE EVERY DAY EXCEPT FRIDAY AND SATURDAY...WITH THE BEST CHANCE ON THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND THIS EVENING. WYZ059-061>066-151200- CONVERSE-SOUTHWEST CARBON-NORTH CARBON-SNOWY RANGE- NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- 1044 AM MDT MON AUG 14 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A SLIGHT CHANCE OF THUNDERSTORMS THIS AFTERNOON AND EVENING. THE STORMS ARE NOT EXPECTED TO BE SEVERE...ALTHOUGH THE STRONGER STORMS COULD PRODUCE WIND GUSTS TO 45 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY AT LEAST ISOLATED THUNDERSTORMS WILL BE POSSIBLE EVERY DAY EXCEPT FRIDAY AND SATURDAY...WITH THE BEST CHANCE ON THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
The Cheyenne radar (KCYS), 111 km away, was scanning. The volume nearest the first event began at 23:44 UTC.
1 flash flood. Local standard time, as filed.
Rainfall from 3 to 4 inches fell over the La Grange, WY. area and produced street flooding with some water in basements. A county road bridge was also washed out.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2006Every state in 2006This day in weather historyWarnings in Wyoming, August 2006
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: 5525968.