1 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 Apr 22, 1:45 AM CST, 4 hours 15 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 245 AM CDT SUN APR 22 2001 THIS IS THE KIND OF FCST THAT A HYDROLOGIST WORKING THE FORECAST DESK ON A MIDNIGHT SHIFT DREAMS OF...OR IS THAT HAS NIGHTMARES ABOUT. AVN AND ETA IN GENERAL AGREEMENT ON MAIN FEATURES THRU 60 HOURS. ETA BRINGS MID LVL WRM FNTL BNDRY MUCH FARTHER N AND W INTO THE CWA AHEAD OF MAIN LOW THAN THE AVN. WILL OPT FOR ETA SOLUTION ON THE DETAILS WHERE THEY DIFFER. SVR THREAT IN FAR SERN ZONES THIS EVNG AT THE NOSE OF THE DRY SLOT THAT WILL MOV INTO ERN NE AND WRN IA. STRONG LIFT...DECENT INSTABILITY...AND SOME DIFFERNTIAL THETA-E ADVECTION TO COME TOGETHER SE OF THE MID LVL FRNTL BNDRY BETWEEN 00Z AND 06Z. TOUGHEST QUESTION FOR THIS FCST IS SNOW CHCS IN WRN CWA TNGT. ETA SNOW ACCUMUALTION IS VERY IMPRESSIVE JUST TO THE W OF THE CWA. LOOKING AT THICKNESS FOR SEVERAL DIFFERENT LAYERS...IT LOOKS LIKE THE FAR WRN ZONES WL SEE THE PRECIP CHG TO SNOW THIS EVNG... WITH THE CHANGEOVER SPREADING EAST ACRS MUCH OF THE CWA THRU 12Z MON. BEST CHCS FOR ACCUMULATION WL BE FROM THE JAMES RIVER WEST... WITH A QUICK SHOT OF HEAVIER SNOW CENTERED AROUND 06Z. IF THE WRM FRNTL BNDRY DOES NOT MOV AS FAR N AND W AHEAD OF THE LOW...SNOW CHCS WOULD BE BETTER SINCE THERE WONT BE AS MUCH WARM AIR FOR THE STRONG DYNAMICS TO OVERCOME. NO CHGS TO THE EXTENDED ATTM. STILL LOOKS LIKE GENERALLY DRY WITH A WARMING TREND THROUGH THE END OF THE WEEK. .FSD...WINTER STORM WATCH TONIGHT FAR NWRN CWA GILLISPIE
SDZ071-IAZ012>014-020>022-031-032-NEZ014-222115- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 410 AM CDT SUN APR 22 2001 ...MODERATE RISK OF SEVERE THUNDERSTORMS IN MUCH OF NORTHWEST IOWA... STRONG LOW PRESSURE DEVELOPING OVER COLORADO THIS MORNING IS EXPECTED TO MOVE NORTHEAST...AND CROSS OVER NORTHWEST IOWA TONIGHT. HUMID AND UNSTABLE AIR ALONG AND SOUTHEAST OF THE TRACK OF THE LOW WILL COMBINE WITH VERY STRONG WIND FIELDS TO PRODUCE A SIGNIFICANT SEVERE WEATHER THREAT. THE THREAT OF SEVERE STORMS WITH LARGE HAIL...DAMAGING WINDS...AND POSSIBLY TORNADOES...WILL BE MAINLY LATE THIS AFTERNOON AND THIS EVENING. THE GREATEST SEVERE WEATHER THREAT INCnLUDES NORTHWEST IOWA EXCEPT FOR THE FAR NORTHERN BORDER COUNTIES...AS WELL AS DAKOTA COUNTY IN NEBRASKA AND UNION COUNTY IN SOUTH DAKOTA. WILLIAMS/GILLISPIE
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Heavy rains caused flooding along Pipestone Creek, with a crest 3.6 feet above flood stage on the 23rd.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2001Every state in 2001This day in weather historyWarnings in Minnesota, 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: 5242961.