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 27, 2:30 AM MST, 5 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 330 AM MDT SUN AUG 27 2006 .SHORT TERM...TODAY THROUGH MONDAY...SATELLITE WATER VAPOR LOOP SHOWS A WEAK CIRCULATION CURRENTLY OVER NERN WY ASSOCIATED WITH STRONG SHORTWAVE TROUGH THAT IS PUSHING INTO HIGH PLAINS. MORE IMPORTANT UPPER LOW IS SHIFTING INTO NW CORNER OF CO. MODELS CONTINUE IDEA OF TRACKING IT JUST SOUTH OF SOUTHERN WY BORDER TODAY THEN TURN IT ENE THROUGH SE CRNR WY AND WESTERN NEBRASKA THIS EVENING. ALTHOUGH MAIN PRECIP NOW IS CONFINED TO JUST THE FAR EASTERN CWA WITH SHORTWAVE TROUGH...STILL EXPECT SHOWERS TO FILL BACK IN AND GET CAUGHT IN WRAP AROUND SO HIGH POPS REMAIN IN ORDER FOR TODAY. CLOUDS AND COOL TEMPS WILL LIMIT INSTABILITY THOUGH. SHOWERS/FEW TSTMS WILL SLOWLY DECREASE FROM WEST TO EAST TONIGHT. MAIN MODEL DIFFERENCE PERSISTS FOR MON WITH NAM/WRF CONTINUING TO SHOW LIGHT QPF OVER EASTERN AREAS MON MORNING...AND OVER MUCH OF CWA MON AFTERNOON VS. DRIER GFS. THIS DIFFERENCE EXISTS DESPITE BOTH MODELS SHOWING THE UPPER LOW MOVING EAST ACROSS NEBRASKA. SO...IN ADDITION TO THE SHOWERS IN EASTERN CWA...A LOW TSTM POP MAY BE IN ORDER IN SE WY ROUGHLY FROM LAR TO DGW EASTWARD. TEMPS WILL NOT BE AS COOL MONDAY...MAV NUMBERS TOO WARM GIVEN H7 TEMPS. .LONG TERM...NORTHEAST FLOW WILL BE ALOFT MONDAY NIGHT AS THE UPPER LOW MOVES SLOWLY EAST ACROSS NEB. E TO SE WINDS WL CONT AT THE SFC WITH LOW AND SOME MID LEVEL MOISTURE OVER THE NEB PANHANDLE. WILL GO WITH A SLIGHT CHANCE OF EVENING THUNDERSTORMS OVER THE PANHANDLE. TUES THRU THUR MORNING WILL BE DRY AS UPPER RIDGE AXIS MOVES EAST OF THE CWA. THE UPPER FLOW OVER THE FORECAST AREA WILL BECOME SW AT THIS TIME AS AN UPPER TROUGH MOVES INLAND ALONG THE NW COAST. THE UPPER TROUGH WILL BEGIN TO MOVE INTO THE NORTHERN ROCKIES ON THURSDAY. WILL MENTION A SLIGHT CHANCE OF THUNDERSTORMS ACROSS THE WEST PORTION OF THE CWA THUR AFTERNOON. THEN FOR THUR EVENING...SHOWERS WILL OCCUR WEST OF THE LARAMIE RANGE WITH THUNDERSTORMS TO THE EAST. THE UPPER TROF AXIS WILL MOVE OVER THE CWA FRIDAY AND A FAIRLY STRONG COLD FRONT WILL MOVE ACROSS THE FORECAST AREA EARLY IN THE DAY. NW FLOW WILL DEVELOP ALOFT SATURDAY AS THE TROUGH SPINS UP AN UPPER LOW OVER THE NORTHERN PLAINS. WILL GO WITH DRY CONDITIONS DURING THIS TIME. HIGH TEMPERATURES WILL BE AROUND NORMAL EACH DAY...WITH THE EXCEPTION OF FRIDAY...WHEN TEMPERATURES WILL BE AROUND 5 TO 10 DEGREES BELOW NORMAL. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE NE...NONE && JLH/KMD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 503 AM MDT SUN AUG 27 2006 NEZ001>003-019>021-054-055-WYZ059>070-281115- 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- 503 AM MDT SUN AUG 27 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SHOWERS AND ISOLATED THUNDERSTORMS WILL OCCUR ACROSS THE AREA TODAY AND TONIGHT. THE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE IS A SLIGHT CHANCE OF LATE DAY THUNDERSTORMS EAST OF THE LARAMIE RANGE ON MONDAY...AND ACROSS THE AREA ON THURSDAY. SEVERE DROUGHT CONDITIONS WILL PERSIST OVER MUCH OF THE REGION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. KMD
The Cheyenne radar (KCYS), 152 km away, was scanning. The volume nearest the first event began at 14:31 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains resulted in some flooding of county roads along Cow Creek.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2006Every state in 2006This day in weather historyWarnings in Nebraska, 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: 5525970.