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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Aug 27, 2:45 PM CST, 3 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 345 PM CDT TUE AUG 27 2002 TRICKY WX PTRN CONTS IN THE SHORTER TERM...GENERALLY CHARACTERIZED BY LARGE LOW LVL HIGH PRES OVER THE GRTLKS AND WK SHORTWVS TO THE WEST. DISSIPATING TS COMPLEX IN E CNTRL NEB THRU MIDDAY...HAS CREATED A RESIDUAL VORT FILAMENT ACRS THE AREA...NOT PICKED UP BY THE 1Z ETA BUT DID GET INTRODUCED BY THE 18Z ETA. VIS SAT PICTURE AND AREA 88DS SHOW A LINE OF CONVECTION FROM THE SE NEB/NE KS BORDER...STRAIGHT NWD INTO FAR SE SD. THESE STORMS WITH NOTHING IN THE WAY OF SHEAR TO WORK WITH...ARE EXHIBITING LITTLE MOVEMENT AND DUMPING SOME PRETTY GOOD AMNTS OF RAIN IN ISOLD SPOTS. SPOTTER NEAR WAKONDA RECEIVED ABOUT 2 INCHES FROM ONE TS LATE THIS AFTN. IN ADDN...SOME MORE ISOLD DEVELOPMENT CONTS ON THE BUFFALO RIDGE ARND KMML...LIKELY ENHANCED BY SOME LOW LVL UPSLOPE AND SOME DIFFERENTIAL HEATING EARLIER IN THE DAY FROM LAST NIGHTS STRATUS CLOSE TO THAT AREA. BUT ANYWAY...WITH PLENT OF CU/TCU POPPED THROUGHOUT THE FSD FA...HAD TO ACCOUNT FOR ISOLD ERLY EVE ACTIVITY UNTIL THE SUN WANES...EXCEPT ARND KYKN WHERE I HIT THINGS A BIT HARDER CLOSER TO THE VORT LOBE. SMALL SHORTWV THEN BEGINS TO MOVE INTO THE AREA WEST OF HERE LATER TNGT...POSSIBLY INFLUENCING THE WRN HALF OF THE CWA WITH SOME TS/SHRA. THIS WAVE IS STILL FCST TO NUDGE INTO THE FSD FA ON WED...POSSIBLY SPREADING SOME TS FURTHER EAST ALONG THE I 29 CORRIDOR. IT HAS BEEN VERY DIFFICULT TO TIME THESE FEATURES...AND WITH NO CAPPING PRESENT AT ALL...ONE CAN SEE THAT THESE SHOWERS CAN ALMOST GO AT ANYTIME OF THE DAY. SVR THREAT ON WED OR WED EVE SHOULD BE VERY LIMITED WITH VERY WEAK SHEAR CONTINUING...AND INSTABILITY/CAPES WHICH ARE ONLY MARGINAL AT BEST. CANNOT RULE OUT WITH THESE SLOW MOVG TS A FEW LOCATIONS GETTING SOME HEAVY RAIN HOWEVER. WAVE TRIES TO EXIT THE CWA WED NIGHT IN A DIFLUENT FLOW PATTERN... LEAVING A SMALL CHC OF TS ACRS THE AREA WITH MAYBE A LITTLE BETTER CHANCE IN THE FAR ERN FSD FA. KIND OF THE SAME STORY ON THURSDAY WITH UPR DIFLUENCE CONTINUING. KEPT POPS IN NW IA AND PART OF SW MN...BUT MAY HAVE TO EXPAND THIS TOMORROW. NEXT WELL ADVERTISED SHORTWV MOVES INTO THE AREA ON FRIDAY. BUT LIKE YDAY...THE LOW LVL JET HAS A HARD TIME GETTING ESTABLISHED AHEAD OF THIS ONE LIMITING TS CHANCES TO SMALL POPS. LOOK FOR A WARMUP ACRS THE CWA THIS WEEKEND AS 850 TEMPS CLIMB INTO THE LOWER 20S C...SO WENT WL ABV MEX/FMR GUIDANCE BOTH DAYS. THEN A FAIRLY STRONG CDFNT IS FCST TO DROP THRU THE AREA ON MON...GIVING SOME PARTS OF THE ERN CWA A CHC FOR TS. .FSD...NONE 31
The Sioux Falls radar (KFSD), 122 km away, was scanning. The volume nearest the first event began at 00:16 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall flooded roads, ditches, and other low areas.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2002Every state in 2002This day in weather historyWarnings in Nebraska, August 2002
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: 5317690.