1 thunderstorm wind, 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 21, 2:00 AM CST, 30 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 300 AM CDT WED JUL 21 2004 .DISCUSSION... SCTD TSRA WL CONT ACRS FAR SERN CWA INTO EARLY MRNG HRS...AND THEN QUICKLY DSIPT AFT 12-14Z AS SFC FNT PUSHES TO THE SE. THIS FNT WL STALL OUT ACRS IA AND NE THRU THU AFTN BEFORE BEING PUSHED S BY COLD HIGH PRES SETTLING INTO THE REGION FOR THE WEEKEND. THIS FNT WL ACT AS A FOCUS TO KEEP A CHC/SLGT CHC TSRA ACRS SRN ZONES THIS AFTN THRU THU AFTN. TEMPS WL AGAIN BE FAIRLY WRM TODAY...BUT DWPTS WL BE DROPPING ACRS ALL XCPT FAR SERN ZONES...SO HEAT INDICES WL BE LOWER...TOPPING OUT AROUND 100-103 IN THE SE. COLDER AIR STARTS FILTERING IN BEHIND POLAR FNT ON THU...WITH BELOW NORMAL TEMPS TO CONT THRU EARLY NEXT WEEK. SRLY FLW TRIES TO RETURN BY SUN AFTN AS STUBBORN HIGH PRES SLIDES EWD...AND WITH MAINLY MID LVL WAA AND MSTR RETURN...WL HAVE SLGT CHC/CHC POPS FOR AFTN AND EVNG SHRA/TSRA SUN AND MON. && .FSD...WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && MG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1139 AM CDT TUE JUL 20 2004 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-211200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 1139 AM CDT TUE JUL 20 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... A WEAK SURFACE BOUNDARY FROM NORFOLK NEBRASKA TO WINNER WILL LIFT NORTHEAST THIS AFTERNOON...AND SHOULD SERVE AS A FOCUS FOR SCATTERED THUNDERSTORM DEVELOPMENT. THE MAIN THREATS FROM THE STRONGEST THUNDERSTORMS WILL BE VERY LARGE HAIL...POSSIBLY AS LARGE AS TENNIS BALLS...AND STRONG AND GUSTY WINDS TO 70 MPH. WHILE TORNADOES ARE UNLIKELY...STORMS THAT DEVELOP ON THE FRONT WILL NEED TO BE MONITORED. THE BETTER CHANCE FOR AN ISOLATED TORNADO SHOULD BE ALONG A LINE FROM NEAR HURON TO MITCHELL TO SIOUX CITY. EXCESSIVE TEMPERATURES... HEAT INDICES WILL REACH THE 100 TO 105 DEGREE RANGE THIS AFTERNOON... AND MAY BRIEFLY HIT 105 TO 107 ALONG THE MISSOURI RIVER BETWEEN YANKTON AND SIOUX CITY. HIGH TEMPERATURES WILL BE IN THE MID TO UPPER 90S WITH DEWPOINT TEMPERATURES IN THE MID 70S. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THERE IS A SLIGHT CHANCE OF THUNDERSTORMS WEDNESDAY AFTERNOON AND EVENING ALONG THE MISSOURI RIVER. THESE STORMS ARE NOT EXPECTED TO BE SEVERE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 500 PM CDT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK. 08
PRELIMINARY LOCAL STORM REPORT ... SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
934 PM CDT TUE JUL 20 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0614 PM HAIL 9 S MOUNT VERNON 43.58N 98.26W
07/20/2004 1.00 INCH DAVISON SD PUBLIC
0631 PM HAIL 8 ENE CORSICA 43.47N 98.26W
07/20/2004 1.00 INCH DOUGLAS SD TRAINED SPOTTER
0636 PM HAIL 6 S MITCHELL 43.65N 98.03W
07/20/2004 1.00 INCH DAVISON SD AMATEUR RADIO
0639 PM HAIL 5 S MITCHELL 43.66N 98.03W
07/20/2004 1.75 INCH DAVISON SD TRAINED SPOTTER
0645 PM HAIL MITCHELL 43.73N 98.03W
07/20/2004 1.75 INCH DAVISON SD LAW ENFORCEMENT
AT INTERSTATE 90 INTERCHANGE JUST WEST OF CITY.
0647 PM HAIL MITCHELL 43.73N 98.03W
07/20/2004 1.00 INCH DAVISON SD AMATEUR RADIO
ON SOUTH SIDE OF TOWN
0655 PM HAIL 6 WSW FULTON 43.69N 97.93W
07/20/2004 1.75 INCH HANSON SD TRAINED SPOTTER
0655 PM HAIL 10 W DIMOCK 43.48N 98.19W
07/20/2004 1.50 INCH DOUGLAS SD TRAINED SPOTTER
0700 PM HAIL 7 NE CORSICA 43.50N 98.31W
07/20/2004 0.75 INCH DOUGLAS SD TRAINED SPOTTER
0700 PM HAIL 14 S MOUNT VERNON 43.51N 98.26W
07/20/2004 0.75 INCH DAVISON SD TRAINED SPOTTER
0708 PM HAIL FULTON 43.73N 97.82W
07/20/2004 1.00 INCH HANSON SD TRAINED SPOTTER
0710 PM HAIL FULTON 43.73N 97.82W
07/20/2004 1.00 INCH HANSON SD TRAINED SPOTTER
0719 PM HAIL 8 NNE MITCHELL 43.84N 97.97W
07/20/2004 0.75 INCH DAVISON SD TRAINED SPOTTER
0723 PM HAIL 3 WNW FULTON 43.74N 97.88W
07/20/2004 0.75 INCH HANSON SD TRAINED SPOTTER
0723 PM HAIL 10 W DIMOCK 43.48N 98.19W
07/20/2004 0.75 INCH DOUGLAS SD TRAINED SPOTTER
0730 PM TSTM WND GST 6 SW MITCHELL 43.67N 98.12W
07/20/2004 60 MPH DAVISON SD TRAINED SPOTTER
CORN FLATTENED BY WINDS
0730 PM HAIL 12 S MOUNT VERNON 43.54N 98.26W
07/20/2004 0.88 INCH DAVISON SD LAW ENFORCEMENT
0732 PM HAIL 15 N DELMONT 43.27N 98.16W
07/20/2004 0.75 INCH DOUGLAS SD TRAINED SPOTTER
0745 PM HAIL 1 N CANOVA 43.88N 97.50W
07/20/2004 1.75 INCH MINER SD TRAINED SPOTTER
0745 PM HAIL 7 N SPENCER 43.83N 97.59W
07/20/2004 1.00 INCH MCCOOK SD PUBLIC
0752 PM HAIL CANOVA 43.88N 97.50W
07/20/2004 1.00 INCH MINER SD TRAINED SPOTTER
0755 PM HAIL CANOVA 43.88N 97.50W
07/20/2004 3.00 INCH MINER SD PUBLIC
0755 PM HAIL CANOVA 43.88N 97.50W
07/20/2004 0.88 INCH MINER SD EMERGENCY MNGR
0814 PM HAIL 10 W MADISON 44.01N 97.31W
07/20/2004 0.88 INCH LAKE SD EMERGENCY MNGR
0821 PM TSTM WND GST MADISON 44.01N 97.11W
07/20/2004 70 MPH LAKE SD TRAINED SPOTTER
0823 PM HAIL MADISON 44.01N 97.11W
07/20/2004 0.88 INCH LAKE SD EMERGENCY MNGR
0823 PM TSTM WND GST MADISON 44.01N 97.11W
07/20/2004 70 MPH LAKE SD EMERGENCY MNGR
POWER LINES DOWN
0835 PM HAIL WENTWORTH 44.00N 96.96W
07/20/2004 0.75 INCH LAKE SD FIRE DEPT/RESCUE
0844 PM HAIL 7 N COLMAN 44.09N 96.82W
07/20/2004 2.75 INCH MOODY SD TRAINED SPOTTER
BROKE WINDSHIELD OF CAR
0907 PM HAIL 2 N FLANDREAU 44.08N 96.60W
07/20/2004 0.75 INCH MOODY SD AMATEUR RADIO
&&
PSSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 105 AM CDT WED JUL 21 2004 MNZ071-072-080-081-089-090-097-SDZ038>040-055-056-210630- BEADLE-BROOKINGS-COTTONWOOD MN-JACKSON MN-KINGSBURY-LAKE-LINCOLN MN- LYON MN-MOODY-MURRAY MN-NOBLES MN-PIPESTONE MN- 105 AM CDT WED JUL 21 2004 ...SEVERE THUNDERSTORM WATCH NUMBER 660 HAS BEEN ALLOWED TO EXPIRE... THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT UNTIL 100 AM CDT FOR PORTIONS OF EAST CENTRAL SOUTH DAKOTA AND SOUTHWEST MINNESOTA HAS BEEN ALLOWED TO EXPIRE. AN ISOLATED SEVERE THUNDERSTORM IS STILL POSSIBLE EARLY THIS MORNING...HOWEVER THE THREAT OF WIDESPREAD SEVERE WEATHER HAD DIMINISHED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
239 AM CDT WED JUL 21 2004
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION...ST.. ...SOURCE....
..REMARKS..
0821 PM TSTM WND DMG MADISON 44.01N 97.11W
07/20/2004 LAKE SD EMERGENCY MNGR
TREES UPROOTED/LARGE BRANCHES DOWN/ROAD SIGNS BLOWN
OVER/POWER POLES DOWNED/80-90 MPH GUSTS ESTIMATED OVER A
2 BLOCK WIDE AREA IN MADISON BETWEEN 821 AND 825 PM CDT.
&&
MGThe Sioux Falls radar (KFSD), 107 km away, was scanning. The volume nearest the first event began at 08:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds caused tree damage, including two to four inch diameter branches broken off.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2004Every state in 2004This day in weather historyWarnings in Iowa, July 2004
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: 5416491.