1 tornado, as filed by the National Weather Service.
Every event with a place to put it. 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 20, 9:50 AM CST, 1 hour 49 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 1050 AM CDT FRI JUL 20 2001 DEALING WITH SAME OLD ISSUES TODAY...WITH SUPERCELL PLOWING ACRS SW MN CWA ATTM. STORMS STRONGER AND CLOSER TO KFSD THAN YDA...AND OUTFLOW BOUNDARY WILL MAKE MORE SIGNIFICANT SWRD PUSH...THRU MOST OF CWA IF NOT ALL BY EARLY AFTERNOON. OUTFLOW AGAIN PUSHING INTO UNSTABLE AIRMASS...AND MAY RESULT IN ADDITIONAL MORE SHORT LIVED ACTION TO SOUTH OF SUPERCELL. WL TWEEK TMPS DOWN A BIT FOR MORE CLOUDY AREAS S...WHERE 12Z RUNS INDICATE A BIT MORE MID LVL CLDS THRU DAY...AND THUNDERSTORMS TO LINGER A BIT LONGER. SPC BOX FOR ERN CWA IN ERLR UPDTS. PROBABLY DO IT ALL OVER AGAIN LATE TONIGHT AND SUNDAY MORNING. .FSD...NONE CHAPMAN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
848 AM CDT FRI JUL 20 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0825 AM 1 NW WOLSEY SD 1.75 INCH HAIL
07/20/01 BEADLE REPORTED BY STORM
SPOTTER.
0825 AM WOLSEY SD .75 INCH HAIL
07/20/01 BEADLE HAIL CONTINUED UNTIL
830 AM CDT. REPORTED BY
STORM SPOTTER.PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1046 AM CDT FRI JUL 20 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0945 AM ERWIN SD WIND DAMAGE
07/20/01 KINGSBURY WIND KNOCKED DOWN TREES.SIGNIFICANT WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1130 AM CST FRI JUL 20 2001 *** THIS SIGNIFICANT WEATHER OUTLOOK FROM THE NATIONAL WEATHER SERVICE PERTAINS ONLY TO CONDITIONS ASSOCIATED WITH THUNDERSTORMS. *** .SYNOPSIS... LITTLE HAS CHANGED IN THE OVERALL PATTERN...WHICH SHOULD YIELD ANOTHER ROUND OF THUNDERSTORMS THIS EVENING AND ESPECIALLY OVERNIGHT ACROSS THE AREA. A WELL DEFINDED OUTFLOW BOUNDARY WILL FESTER THIS AFTERNOON AND EVENING AS IT STALLS OUT BETWEEN INTERSTATE 90 AND THE MISSOURI RIVER. RECOVERY FROM THE MORNING AND EARLY AFTERNOON RAINFALL WILL BE LIMITED IN FAR EASTERN SOUTH DAKOTA...SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA DUE TO DEBRIS FROM THE MORNING AND EARLY AFTERNOON CONVECTION. HOWEVER...AREAS THROUGH CENTRAL SOUTH DAKOTA WILL HAVE ABUNDANT HEATING...AND DESTABILIZE THROUGH THE AFTERNOON. WEAK CONVERGENCE WILL ALLOW FOR STORMS TO DEVELOP ACROSS AREAS OF CENTRAL SOUTH DAKOTA THIS EVENING...BENEATH SOME RELATIVE DRY AIR ALOFT. THESE STORMS WILL HAVE VERY WEAK FLOW AND SLOW MOTION. OTHER STORMS SHOULD INITIATE ALONG A LEFTOVER BOUNDARY ACROSS NORTHEAST NEBRASKA AND NORTHWEST IOWA AS LOW LEVEL FLOW BECOMES MORE CONVERGENT AND STRONGER THIS EVENING. FINALLY...A STRONG UPPER LEVEL WAVE PASSING WELL NORTH OF THE REGION WILL REINVIGORATE THE LOW LEVEL JET TONIGHT ACROSS THE PLAINS...AND RESULT IN ANOTHER ORGANIZED COMPLEX SLIDING GENERALLY EAST AND SLIGHTLY SOUTH OF EAST LATE TONIGHT. WHILE TEMPERATURES CONTINUE WARM IN THE MID LEVELS TO LIMIT WIDESPREAD HAIL POTENTIAL... ISOLATED STORMS WHICH DEVELOP ROTATING UPDRAFTS WILL LIKELY SUSTAIN ENOUGH STRENGTH TO PRODUCE LARGER HAIL. SDZ038>040-052>056-211200- BEADLE-KINGSBURY-BROOKINGS-JERAULD-SANBORN-MINER-LAKE-MOODY- INCLUDING THE CITIES OF...HURON...BROOKINGS... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: AN ISOLATED THUNDERSTORM MAY DEVELOP DURING THE EVENING...BUT THE GREATER THREAT FOR THUNDERSTORMS AND SIGNIFICANT WEATHER SHOULD BE AFTER MIDNIGHT...WHEN ANOTHER LARGE COMPLEX OF THUNDERSTORMS PRESSES EAST AND SOUTHEAST ACROSS THE REGION. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 200 AM. MNZ071-072-080-081-089-090-097-IAZ003-211200- LINCOLN-LYON-PIPESTONE-MURRAY-COTTONWOOD-NOBLES-JACKSON-DICKINSON- INCLUDING THE CITIES OF...PIPESTONE...SLAYTON...WORTHINGTON...SPIRIT LAKE... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: RECOVERY AFTER WEAKENING EARLY AFTERNOON SHOWERS AND THUNDERSTORMS WILL BE SLOW TO OCCUR...WITH THE NEXT THREAT OF SIGNIFICANT WEATHER COMING LATE TONIGHT. A LARGE ORGANIZED COMPLEX OF THUNDERSTORMS IS EXPECTED TO MOVE INTO THE AREA VERY LATE TONIGHT. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 400 AM. SDZ050-057>060-063>065-068-211200- BRULE-AURORA-DAVISON-HANSON-GREGORY-CHARLES MIX-DOUGLAS-HUTCHINSON- BON HOMME- INCLUDING THE CITIES OF...CHAMBERLAIN...MITCHELL... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: SCATTERED THUNDERSTORMS WILL BE POSSIBLE DURING THE MID TO LATE EVENING HOURS. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 700 PM. SDZ061-062-066-067-MNZ098-IAZ001-002-012>014-211200- MCCOOK-MINNEHAHA-ROCK-TURNER-LINCOLN-LYON-OSCEOLA-SIOUX-OBRIEN-CLAY- INCLUDING THE CITIES OF...SIOUX FALLS...LUVERNE...ROCK RAPIDS...SIOUX CENTER... SPENCER... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: EXPECT THUNDERSTORMS TO DEVELOP LATE TONIGHT...AND LIKELY WILL BE IN THE FORM OF AN ORGANIZED CONVECTIVE COMPLEX. * SIGNIFICANT WEATHER: STRONG WINDS...GUSTS LESS THAN 58 MPH. SMALL HAIL...LESS THAN DIME SIZE. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 300 AM. SDZ069>071-IAZ020>022-031-032-NEZ013-014-211200- YANKTON-CLAY-UNION-PLYMOUTH-CHEROKEE-BUENA VISTA-DIXON-DAKOTA-WOODBURY- IDA- INCLUDING THE CITIES OF...YANKTON...LE MARS...STORM LAKE...SIOUX CITY... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: SCATTERED THUNDERSTORMS SHOULD DEVELOP THIS EVENING...AND BECOME MORE NUMEROUS TOWARD MIDNIGHT. A SECOND ROUND OF DEVELOPMENT IS POSSIBLE LATER IN THE NIGHT. * SIGNIFICANT WEATHER: ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 900 PM.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1215 PM CDT FRI JUL 20 2001
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0900 AM 5 NNW WHITE SD .75 INCH HAIL
07/20/01 BROOKINGS REPORTED BY PUBLIC.SIGNIFICANT WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1130 AM CST FRI JUL 20 2001 *** THIS SIGNIFICANT WEATHER OUTLOOK FROM THE NATIONAL WEATHER SERVICE PERTAINS ONLY TO CONDITIONS ASSOCIATED WITH THUNDERSTORMS. *** .SYNOPSIS... LITTLE HAS CHANGED IN THE OVERALL PATTERN...WHICH SHOULD YIELD ANOTHER ROUND OF THUNDERSTORMS THIS EVENING AND ESPECIALLY OVERNIGHT ACROSS THE AREA. A WELL DEFINDED OUTFLOW BOUNDARY WILL FESTER THIS AFTERNOON AND EVENING AS IT STALLS OUT BETWEEN INTERSTATE 90 AND THE MISSOURI RIVER. RECOVERY FROM THE MORNING AND EARLY AFTERNOON RAINFALL WILL BE LIMITED IN FAR EASTERN SOUTH DAKOTA...SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA DUE TO DEBRIS FROM THE MORNING AND EARLY AFTERNOON CONVECTION. HOWEVER...AREAS THROUGH CENTRAL SOUTH DAKOTA WILL HAVE ABUNDANT HEATING...AND DESTABILIZE THROUGH THE AFTERNOON. WEAK CONVERGENCE WILL ALLOW FOR STORMS TO DEVELOP ACROSS AREAS OF CENTRAL SOUTH DAKOTA THIS EVENING...BENEATH SOME RELATIVE DRY AIR ALOFT. THESE STORMS WILL HAVE VERY WEAK FLOW AND SLOW MOTION. OTHER STORMS SHOULD INITIATE ALONG A LEFTOVER BOUNDARY ACROSS NORTHEAST NEBRASKA AND NORTHWEST IOWA AS LOW LEVEL FLOW BECOMES MORE CONVERGENT AND STRONGER THIS EVENING. FINALLY...A STRONG UPPER LEVEL WAVE PASSING WELL NORTH OF THE REGION WILL REINVIGORATE THE LOW LEVEL JET TONIGHT ACROSS THE PLAINS...AND RESULT IN ANOTHER ORGANIZED COMPLEX SLIDING GENERALLY EAST AND SLIGHTLY SOUTH OF EAST LATE TONIGHT. WHILE TEMPERATURES CONTINUE WARM IN THE MID LEVELS TO LIMIT WIDESPREAD HAIL POTENTIAL... ISOLATED STORMS WHICH DEVELOP ROTATING UPDRAFTS WILL LIKELY SUSTAIN ENOUGH STRENGTH TO PRODUCE LARGER HAIL. SDZ038>040-052>056-211200- BEADLE-KINGSBURY-BROOKINGS-JERAULD-SANBORN-MINER-LAKE-MOODY- INCLUDING THE CITIES OF...HURON...BROOKINGS... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: AN ISOLATED THUNDERSTORM MAY DEVELOP DURING THE EVENING...BUT THE GREATER THREAT FOR THUNDERSTORMS AND SIGNIFICANT WEATHER SHOULD BE AFTER MIDNIGHT...WHEN ANOTHER LARGE COMPLEX OF THUNDERSTORMS PRESSES EAST AND SOUTHEAST ACROSS THE REGION. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 200 AM. MNZ071-072-080-081-089-090-097-IAZ003-211200- LINCOLN-LYON-PIPESTONE-MURRAY-COTTONWOOD-NOBLES-JACKSON-DICKINSON- INCLUDING THE CITIES OF...PIPESTONE...SLAYTON...WORTHINGTON...SPIRIT LAKE... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: RECOVERY AFTER WEAKENING EARLY AFTERNOON SHOWERS AND THUNDERSTORMS WILL BE SLOW TO OCCUR...WITH THE NEXT THREAT OF SIGNIFICANT WEATHER COMING LATE TONIGHT. A LARGE ORGANIZED COMPLEX OF THUNDERSTORMS IS EXPECTED TO MOVE INTO THE AREA VERY LATE TONIGHT. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 400 AM. SDZ050-057>060-063>065-068-211200- BRULE-AURORA-DAVISON-HANSON-GREGORY-CHARLES MIX-DOUGLAS-HUTCHINSON- BON HOMME- INCLUDING THE CITIES OF...CHAMBERLAIN...MITCHELL... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: SCATTERED THUNDERSTORMS WILL BE POSSIBLE DURING THE MID TO LATE EVENING HOURS. * SIGNIFICANT WEATHER: SEVERE WINDS...GUSTS EQUAL TO OR GREATER THAN 58 MPH. ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 700 PM. SDZ061-062-066-067-MNZ098-IAZ001-002-012>014-211200- MCCOOK-MINNEHAHA-ROCK-TURNER-LINCOLN-LYON-OSCEOLA-SIOUX-OBRIEN-CLAY- INCLUDING THE CITIES OF...SIOUX FALLS...LUVERNE...ROCK RAPIDS...SIOUX CENTER... SPENCER... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: EXPECT THUNDERSTORMS TO DEVELOP LATE TONIGHT...AND LIKELY WILL BE IN THE FORM OF AN ORGANIZED CONVECTIVE COMPLEX. * SIGNIFICANT WEATHER: STRONG WINDS...GUSTS LESS THAN 58 MPH. SMALL HAIL...LESS THAN DIME SIZE. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 300 AM. SDZ069>071-IAZ020>022-031-032-NEZ013-014-211200- YANKTON-CLAY-UNION-PLYMOUTH-CHEROKEE-BUENA VISTA-DIXON-DAKOTA-WOODBURY- IDA- INCLUDING THE CITIES OF...YANKTON...LE MARS...STORM LAKE...SIOUX CITY... 1100 AM CST FRI JUL 20 2001 * FORECAST THROUGH 700 AM: SCATTERED THUNDERSTORMS SHOULD DEVELOP THIS EVENING...AND BECOME MORE NUMEROUS TOWARD MIDNIGHT. A SECOND ROUND OF DEVELOPMENT IS POSSIBLE LATER IN THE NIGHT. * SIGNIFICANT WEATHER: ISOLATED LARGE HAIL...DIME SIZE OR LARGER. HEAVY RAIN. * SPOTTER ACTIVATION: SPOTTER ACTIVATION IS POSSIBLE AFTER 900 PM.
The Sioux Falls radar (KFSD), 109 km away, was scanning. The volume nearest the first event began at 17:38 UTC.
1 tornado. Local standard time, as filed.
A tornado damaged corn crops, but the amount of crop damage was not known.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Minnesota in 2001Every state in 2001This day in weather historyThe tornado archive for Minnesota, 2001Warnings in Minnesota, 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: 5261161.