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 Jul 24, 9:15 AM CST, 13 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 1015 AM CDT WED JUL 24 2001 BONAFIDE TORRENTIAL RAINFALL ACCOMPANYING MCS ACRS SERN SD...XTRM NW IA...AND SW MN THIS MORNING. THUSFAR...STILL WORKING TO BUILD THE NEW DAILY RAINFALL RECORD AT FSD /THRU 10AM...2.14 INCHES/. ACTIVITY IS MAINLY ALG AND N OF STAGNANT LOW LVL BOUNDARY ACRS ERN NEBR AND NW IA...WITH LTST STLT TREND SHOTING REDEVLOPMENT ON SRN FLANK...WITH ADDITIONAL LARGE STRATIFORM AREA IN WAKE. FBY PROF INDICATING MORE THAN FAIR LOW LVL FEED...SO EXPECT CONTINUED TREND FOR REDEVELOPMENT ON SRN FLANK OF MCS THRU AFTN...WITH FOCUS SHIFTING TO NW IA AND SW MN...ALONG WITH WK MID LVL TROUGH. SEVERE THREAT WOULD ALSO BE MINIMAL WITH EXTEND OF STABILIZATION...AND LESS THAN STRONG WND SHEAR. LCLY HVY RAINFALL IS ONLY REMOTE THREAT. TECH NOTES...KFSD RADAR IS STILL OTM UFN. ALSO FOR GOES STLT " ENTHUSIASTS...SIGNIFICANT DEGREE OF PARALLAX OCCURRING WITH RADAR/LIGHTNING DATA DISPLACED ABOUT 20NM TO SOUTH OF STLT COLDEST TOPS. .FSD...NONE CHAPMAN
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Rainfall of three and a half inches caused flooding of the Lyon County fairgrounds, forcing several fair events to be cancelled or postponed. The fair manager described part of the fairgrounds as like a lake, and six to eight inches of water stood in livestock barns.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2001Every state in 2001This day in weather historyWarnings in Iowa, July 2001
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: 5261236.