Moderate to heavy rain resulted in brief minor to moderate flooding of the Big Sioux River near Brookings on April 25th and 26th.
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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 episode as NWS FSD wrote it up.
Moderate to heavy rain resulted in brief minor to moderate flooding of the Big Sioux River near Brookings on April 25th and 26th.
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 24, 8:00 PM CST, 5 hours earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 900 PM CDT TUE APR 24 2007 .DISCUSSION... RAINFALL HAS QUICKLY DIMINISHED ACROSS THE AREA THIS EVENING. BEST UPPER FORCING HAS SHIFTED EASTWARD WHILE LOW LEVEL MOISTURE HAS MOSTLY BEEN EXHAUSTED WITH STRONGER CONVECTION ACROSS SE NEBRASKA EARLIER THIS AFTERNOON. ADDITIONAL THUNDERSTORMS FIRED OVER S CNTRL NEBRASKA LATE THIS AFTERNOON ALONG THE LEADING EDGE OF THE MIDLEVEL DRY INTRUSION. THESE STORMS ARE SLOWLY MOVING NORTH AND EAST...BUT WILL LIKELY SEE A SLOW DEATH WITH THE LOSS OF SFC HEATING...AND SHOULD HAVE A HARD TIME REACHING THE SD BORDER. MODEL QPF FIELDS PRODUCE WIDESPREAD RAINFALL ACROSS THE AREA TONIGHT AND TOMORROW... BUT CURRENTLY DO NOT REPRESENT RADAR RETURNS AND SFC OBS. LOWERED QPF AMOUNTS THE REMAINDER OF THE EVENING AND OVERNIGHT...AND TRIMMED BACK POPS ACROSS THE I-29 CORRIDOR. REST OF THE FORECAST LOOKS TO BE IN GOOD SHAPE. && .AVIATION... VFR IN MOST OF AREA...BCMG MVFR CIGS DVLPG NWD NR MO VALLEY TO NWRN IA...OR SOUTH OF LINE FM KSFD TO KEST BY 09Z...FLWD BY AREAS IFR CIGS AND MVFR VSBYS IN -SHRA AND BR IN SAME AREA BY 12Z. && .PREV DISCUSSION... AREA OF SCATTERED SHOWERS CONTINUES OVER THE SOUTHEASTERN HALF OF THE CWA THIS AFTERNOON...WITH LINGERING MID LEVEL FRONTOGENESIS BAND LYING ACROSS THE AREA. BEST UPPER AND LOWER LEVEL FORCING CURRENTLY EXITING THE EASTERN PORTIONS OF THE CWA...AND PRECIPITATION HAS DWINDLED QUITE A BIT THROUGH THE AFTERNOON HOURS. ANOTHER MORE SIGNIFICANT AREA OF PRECIPITATION IN ASSOCIATION WITH MIDLEVEL WAA/STRONG ISENTROPIC LIFT/AND A LOW LEVEL JET IS PRESENTLY PUSHING NORTHWARD THROUGH EASTERN NEBRASKA...AND WILL ATTEMPT TO MAKE IT INTO OUR SOUTHERN CWA OVER THE NEXT FEW HOURS. BATTLE STILL REMAINS WITH DRY AIR HOLDING STRONG OVER OUR NORTH...AND WOULD NOT EXPECT MUCH...IF ANY...OF THIS TO REACH INTERSTATE 90. WITH THAT THOUGHT IN MIND...HAVE HIGHEST POPS REMAINING OVER OUR SOUTHERN ZONES...WITH NONE IN THE NORTH...THROUGH THE NIGHT TIME HOURS. ANTICIPATE THAT PRECIPITATION WILL DIMINISH SOME DURING THE LAST HALF OF THE NIGHT WITH FORCING WEAKENING OVER THE AREA. ALTHOUGH WE ARE EXPECTING CLOSE TO AN INCH OF ADDITIONAL RAINFALL OVER OUR FAR NORTHWESTERN IOWA ZONES TONIGHT...DO NOT ANTICIPATE ANY REAL FLOODING PROBLEMS AS LONG AS RAINFALL RATES REMAIN REASONABLY LOW. EVEN WITH THE VERY HEAVY RAINS...IN EXCESS OF AN INCH...OVER OUR SOUTHERNMOST IOWA ZONES SINCE LAST NIGHT...RIVER RESPONSE HAS BEEN INSIGNIFICANT. UPPER LOW WL CONTINUE TO MEANDER OVR MS VALLEY THRU THU. THIS WL KEEP SERN CWA UNDER THREAT OF RAIN THRU WED NITE ALONG WITH PLENTY OF CLOUDY COVER. DRIER NELY FLOW AT H85 WL KEEP BLULK OF PRECIP FM GETTING N OF I90 THRU WED NITE. SO WL CONT HIGH POPS ACRS NW IA THRU WED...DECREASING RAPIDLY TOWARDS I90 WITH DRY WX N. CLOUDS AND PRECIP WL KEEP TEMPS IN 50S ACRS NW IA...MODERATING TO THE 60S ACRS NW CWA WHERE SOME SUN IS EXPECTED WED...AND EVEN MORE ON THU. A WEAK S/W WL DROP SEWD ACRS CWA THU NITE INTO FRI MORN AND WL KEEP SMALL POP GOING WITH THIS FEATURE...ALTHO LITTLE IF ANY MEASURABLE RAIN WL OCCUR. THIS S/W SHUD HELP PUSH OUT STUBBORN UPPER LOW OVR MS VALLEY WITH MUCH WARMER TEMPS FOR THIS WEEKEND. HIGHS ON FRI WL BE IN THE 60S TO LOWER 70S CLIMBING INTO 70S AND 80S FOR THE WEEKEND. CUD SEE A VERY HIGH FIRE DANGER ESPEC SUN WITH HIGHS IN 80S MOST PLACES. SHUD CONT WARM INTO MON WITH WEAK BACKDOOR CDFNT LATE MON INTO TUES. WL LEAVE FCST DRY FRI THRU TUES. && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE. && LIEBL/RYRHOLM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1139 AM CDT TUE APR 24 2007 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-251200- 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 APR 24 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT FLOODING... WIDESPREAD RAIN SOUTH OF A LINE FROM LAKE ANDES...TO HAWARDEN IOWA...TO SPENCER IOWA...WILL PRODUCE ONE TO TWO INCHES OF RAINFALL THROUGH TONIGHT. RAINFALL RATES WILL REMAIN LOW ENOUGH THAT FLASH FLOODING IS NOT EXPECTED. HOWEVER...PONDING OF WATER IS POSSIBLE IN DITCHES AND OTHER LOW LYING AREAS THAT ARE NOT WELL DRAINED. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY A VERY HIGH FIRE DANGER WILL BE POSSIBLE SATURDAY AND AGAIN SUNDAY AS WARM AIR BUILDS IN TO THE REGION. AT THIS TIME...TEMPERATURES FROM THE JAMES VALLEY WEST SHOULD REACH THE MID 70S...WITH AFTERNOON RELATIVE HUMIDITIES NEAR 30 PERCENT. WIND SPEEDS OF 15 OR 20 MPH WILL ALSO BE POSSIBLE AT TIMES IN THE AFTERNOON...ESPECIALLY ON SUNDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Moderate to heavy rain led to minor to moderate flooding of the Big Sioux River near Brookings. Fields along the river were flooded, and one rural road was briefly under water.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2007Every state in 2007This day in weather historyWarnings in South Dakota, April 2007
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: 30030.