1 lightning, 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 21, 8:15 PM CST, 6 hours 15 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 915 PM CDT SAT JUL 21 2001 UPDATED THE CWA ZONE AT 02Z. TOOK THE OPPORTUNITY TO CANCEL PART OF SEVERE THUNDERSTORM WATCH 610 FOR THE COUNTIES ALONG AND SOUTH OF INTERSTATE 90...WHILE LEAVING EAST CENTRAL SOUTH DAKOTA COUNTIES NORTH OF I90 IN THE WATCH AND MOST ALL OF THE SOUTHWEST MINNESOTA COUNTIES EXCEPT ROCK. DOUBTFUL THAT ANY SEVERE WEATHER IS GOING TO DEVELOP IN THE SOUTHERN PART OF THE WATCH PRIOR TO 11 PM. WARM ADVECTION AND AN INCREASE IN THE LOW LEVEL JET ALONG WITH LEFT OVER BOUNDARIES COULD STILL LEAD TO THUNDERSTORM DEVELOPMENT IN THE NORTH PART OF THE CWA. ADDITIONAL SHOWER AND THUNDERSTORM DEVELOPMENT IS STILL POSSIBLE DURING THE NIGHTTIME HOURS...BUT LOWERED THE POPS A BIT IN THE FORECAST AREA. CLEANED UP THE WIND FORECAST AND LEFT THE MIN TEMPERATURES AS ISSUED EARLIER. .FSD...NONE UMLAND
The Sioux Falls radar (KFSD), 87 km away, was scanning. The volume nearest the first event began at 08:27 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a house, damaging several appliances and lights.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2001Every state in 2001This day in weather historyWarnings in South Dakota, 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: 5261239.