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 Apr 22, 3:10 PM CST, 2 hours 20 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 410 PM CDT SUN APR 22 2001 KOAX AND KLNX 88DS STILL SHOWING NUMEROUS CONVECTIVE ACTIVITY THROUGHOUT NEBRASKA...AS LARGE MID AND UPR LVL LOW LIFTING NEWD TNGT. BASICALLY...SFC MDL SOLNS DEPICT THE SFC LOW MOVG THRU NW IA LATER TNGT...AND THIS IS PROBABLY GOOD AS THE ETA IS MATCHING UP WITH REALITY GOOD. SVR WX POTENTIAL STILL EXISTS OVR SECTIONS OF NW IA THIS EVENING...AS WMFNT LIFTS NWD AND CATCHES THIS AREA JUST ON THE NORTH SIDE OF IT. WIND SHEAR IS GOOD...AND LLVL THTE/THTE ADV IS STRONG IN THIS AREA...THROUGH AT LEAST MIDNIGHT. INSTABILITY IS SUCH AS TO WARRANT A MENTION OF SVR WX...AND A TORNADO WATCH HAS BEEN ISSUED RECENTLY FOR AROUND THE SIOUX CITY AREA. FURTHER WEST...WINTER WX WORRIES. JAMES VALLEY IS CAUGHT IN THE WRAP ARND...WITH A TROWAL THAT ALMOST DVLPS COMPLETELY IN THIS AREA AND 700MB FRONTOGENESIS. TEMPS ARE VERY CHILLY ALREADY WITH NO HOPE OF WARMING. RUC40 AND MESOETA SNDGS ARE IN VERY GOOD AGREEMENT... SHOWING WM AIR ALOFT STUBBORNLY HANGING ON IN THE JAMES VALLEY THROUGH 06Z TO 07Z...SO THIS AREA WL LIKELY GET A MIX OF FZRA/RA BEFORE RECEIVING SNOW LATE TNGT. FURTHER WEST...THE CHAMBERLAIN AREA LOSES THEIR WM AIR ALOFT IN THE EVENING...S0 ACCUMULATING POTENTIAL IS GREATER. MDLS DEPICT PCPN MOST HEAVY THIS EVENING AND THRU ARND MIDNIGHT...BEFORE SUBSIDING A BIT IN THIS AREA AFT MIDNIGHT. SYSTEM EXITS THE AREA RAPIDLY ON MONDAY...THEN A LONG WV RIDGE DVLPS IN THE RCKYS. ON TUESDAY...ETA BRINGING DOWN A RIDGE RIDER CLIPPING THE NE QUAD OF THE CWA...SIMILAR TO WHAT THE AVN/MRF HAD YDAY... ALTHOUGH THE 12Z AVN IRONICALLY KIND OF NUKED IT TODAY. COULD SPARK A FEW SHOWERS HERE AND THERE OVR THE ERN PTN OF THE CWA UNDER SOME MID LVL CLDS...BUT PCPN WL BE LIGHT. EXTENDED STILL SHOWING VERY WM AIR LATER THIS WEEK AND THRU THE WEEKEND...WITH NO REAL PCPN TO KEY ON. FOR TEMPS...REALLY WENT COOL FOR THE JAMES VALLEY AREA THE NEXT COUPLE OF DAYS...WITH ANTICIPATED SNOW CVR ARND AND AT THE VERY LEAST SOME VERY WET GRND. A LITTLE WARMER IN THE EAST BUT STILL BLO NORMAL 9AND BLO GUIDANCE. DIDN'T WARM THINGS UP TO NORMAL AND ABV NORMAL UNTIL THURSDAY. .FSD...WINTER STORM WARNING TONIGHT FOR THE JAMES AND MO VALLEYS. FUHS
The Sioux Falls radar (KFSD), 11 km away, was scanning. The volume nearest the first event began at 23:27 UTC.
1 lightning. Local standard time, as filed.
Lightning struck a house, injuring a man standing in the wet basement of the house. The lightning also damaged the roof and a wall of the house.
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, April 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: 5242707.