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 21, 2:30 AM CST, 4 hours 25 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SIOUX FALLS SD 330 AM CDT WED AUG 21 2002 AS OF 08Z LINE OF TSTMS WERE SLOWLY PULLG NE OVR SE SD AND SW MN. HVY RAIN HAS BEEN THE PRBLM THE LAST FEW HOURS BUT NO REPORTS OF ANY FLOODG PROBLEMS. SCTD SHWRS IN WRN AREAS NW OF TSTMS LINE WHILE IN SE AREAS OVR NW IA IT STILL IS DRY. WILL PUT A LOW CHC OF SOMETHING MAKING IT INTO NW IA THIS MRNG. PCP SHLD WEND FM W TO E THIS MRNG WITH IT DRY THIS AFTN AND THEN REFORM AGN BY EVE WITH BNDRY FM SE SD INTO SW MN AND HEATG OF DAY. TSTMS WILL CONT ALNG BNDRY INTO TNGT AS S/WV MOVES THRU FM W WITH BEST CHC OVR EXTRM SE SD INTO NW IA WHERE MOST SGNFNT RAIN SHLD OCCUR. KEEP CHC OF SHWRS AND TSTMS GOING OVR SRN PARTS OF CWA OF N OF BNDRY WHERE THERE IS PLNTY OF MSTR AND S/WV MOVG THRU. CRNT FCST HAS IT DRYING OUT FOR FRI BUT MODELS TRYG TO SHOW VORT MAX MOVG E OVR SRN PARTS OF CWA THAT COULD BRING A CHC OF TSTMS THRU SRN ZNS. WILL ADD A CHC THERE FOR FRI. OTRW LOOKS TO BE DRY AND COOL INTO FIRST OF NEXT WEEK. .FSD...NONE 45
The Sioux Falls radar (KFSD), 40 km away, was scanning. The volume nearest the first event began at 12:57 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall of up to six inches caused flooding of roads and low areas. The flooding included the area along Spring Creek, with flooding and resulting damage to several holes on a golf course.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2002Every state in 2002This day in weather historyWarnings in Minnesota, 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: 5317617.