Thunderstorms produced heavy rain which caused flash flooding over southeast South Dakota near the Missouri River between Chamberlain and Pickstown, and north to an area west of Mitchell, during the evening of August 3rd. The thunderstorms also produced damaging winds at a few places.
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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.
Thunderstorms produced heavy rain which caused flash flooding over southeast South Dakota near the Missouri River between Chamberlain and Pickstown, and north to an area west of Mitchell, during the evening of August 3rd. The thunderstorms also produced damaging winds at a few places.
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 Aug 3, 2:35 PM CST, 2 hours 43 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 335 PM CDT FRI AUG 3 2007 .DISCUSSION... COMPLEX FCST IN THE NEAR TERM TONIGHT. ATTM...NMRS SHRA AND TS CONT TO HOLD TOGETHER IN CENTRAL SD...WITH OTHER ISOLD ACTIVITY BEHIND AND TO THE SOUTH OF THE MCV WHERE THE AIRMASS HAS DESTABILIZED. NOT REAL CONCERNED ABOUT SVR WX LATE THIS PM AND EVENING. THE ONLY SECTION OF THE CWFA THAT IS A BIT UNSTABLE IS OUR SW CORNER...WHERE ELEVATED MU CAPES JUST EXCEED 1000 J/KG. WIND SHEAR IS EXCELLENT. HOWEVER WITH THE OBVIOUS STABILITY GOING ON RIGHT NOW WITH THE MCV... LAPSE RATES HAVE BECOME STABILIZED IN THAT AREA. CANNOT RULE OUT AN ISOLD SVR CELL IN OUR SWRN CWFA THRU 02Z...BUT ELSEWHERE IT WL BE TOUGH. FOR TONIGHT...FOLLOWED A BLEND OF THE GFS AND HPC OUTPUT AS THE NAM AND GEM LOOK TO BE PLACING THE QPF TOO FAR NORTH BASED ON CURRENT REALITY. THAT BEING SAID...THE NAM AND GFS ARE VERY CLOSE WITH THEIR RESPECTIVE DYNAMICAL PARAMETERS. BOTH MODELS SHOW EXTREMELY STRONG H85 WAA IN THE ENTIRE FSD FA TONIGHT...WITH A STRENGTHENING LOW LEVEL JET. THIS FA IS ALSO IN A SUBTLE RR ENTRANCE OF A JET STREAK TO THE NE...WITH STRONG MID LVL -DIV Q CENTERED ON I 90. THE NAM PLACED A CONVECTIVE BULLSEYE LATE THIS PM JUST WSW OF MOBRIDGE SD ALONG A CONVECTIVELY INDUCED INVERTED TROF. THAT IS INCREASINGLY LOOKING LESS LIKELY. FURTHERMORE... CORFIDI VECTORS DEFINITELY SHOW A SEWD SLANT...AND THE ENTIRE WAVE BY MIDNIGHT BEGINS TO ERODE THE S/W RIDGE IN FRONT OF IT...AND TAKE MORE OF A ESE TURN. THEREFORE AM EXPECTING THE PCPN TO FILL IN BEHIND THE CURRENT MCV IN CENTRAL SD...AS THE CURRENT ISOLD ACTIVITY BECOMES ORGANIZED AND FILLS IN TO THE WEST AND SW OF THE FA. THE ACTIVITY SHOULD TRACK INITIALLY EWD THRU THE WRN FA...THEN TAKE A SEWD TRACK AS THE OVERNIGHT PROGRESSES INTO THE SE QUAD OF THE FSD FA. AREAS OF HVY RAIN WL BE PROBABLE AS PWATS ARE WELL ABV NORMAL TONIGHT...AND WITH REDEVELOPMENT PERSISTENT. COOLED LOWS TONIGHT AS HIGHS TODAY WERE MODERATED BY THE CLOUDS...AND AM WORRIED ABOUT A LOT OF RAIN COOLED AIR TONIGHT. THE ACTIVITY WL SLOWLY EXIT ESE SAT MORNING WITH THE WAVE...WITH MORE HEAVY RAIN POTENTIAL IN THE IA GRTLKS REGION BEFORE IT GOES. FCST CONTINUES COMPLEX...DUE TO CONVECTIVE COMPLEX AND ITS WANING REMANTS. REJECTED NAM SLN AS APPEARS TO OVERDEVELOP PCPN IN WRONG PLACE OVERNIGHT...AND THEN OVERAMPLIFIES SFC WAVE ON BNDRY WITH VERY LITTLE INDICATION OF OUTFLOW BNDRY SAT...RESULTING IN INCREDIBLE INSTABILITY AND SHEAR. IN ACTUALITY...NOT TERRIBLY HIGH ON SEVERE WEATHER THREAT OVER MUCH OF CWA AS EXPECT A VAST PROBLEM WITH DESTABILIZING IN WAKE OF OVERNIGHT AND MORNING CONVECTIVE COLD POOL. WL HAVE TO MONITOR HOW FAR SWRD THE OUTFLOW BNDRY CAN PUSH...BUT WOULD APPEAR THAT IT WILL WELL CLEAR THE CWA TO THE SOUTH...LEAVING ELEVATED INSTABILITY THE MAIN THREAT SOURCE. SREF LOOKS TO KEEP A HIGH PROBABILITY OF MEASURABLE THRU SRN TIER THRU EVNG...AND LIKE THE GFS CLUSTER OF SLNS ON THAT FRONT. WK PUSH OF DRIER AIR BEHIND SYSTEM ON SAT NIGHT WITH SFC RIDGE BECOMING CENTERED OVER AREA. WL HAVE TO WATCH FOR FOG THREAT...AS WL HAVE A VERY SIGNIFICANT INVERSION. BNDRY WL START TO SAG INTO AREA FROM NORTH IN RESPONSE TO IMPULSE IN WLY FLOW...BUT WL SLOW HEAING TOWARD I90 LTR SUN NIGHT AND MON. THIS WL SET UP POTENTIAL FOR A VERY STRONG THERMAL CONTRAST ON MON...ESPLY IF CLOUDS AND PRECIP CAN ENHANCE CONTRAST OVR BNDRY. ANOTHER WAVE COMING OUT OF MEAN WRN TROUGH WL START TO ENHANCE LOW LVL FLOW SUN NIGHT...ON EDGE OF DEEPER MOISTURE RETURN...EVENTUALLY FAVORING A LOW CHANCE BY AFTN ACRS NRN CWA. ONE LOCATION TO BE WARY OF BY LATER MON AFTN/EVNG FOR SVR THREAT WOULD BE THE EMERGING TRIPLE POINT AT WARMFRONT/DRYLINE INTERSECTION IN SCNTRL SD. IT IS VERY WARM ALFT...BUT MAY BE ABLE TO HEAT CLOSER TO THE CENTURY MARK AND BREAK STRONGER CAP...ALL THE TIME ELEVATED CONVECTION CONTINUES ARCING TO THE NE OF THIS AREA. PATTERN IN THE EXTENDED RANGE IS QUITE INTRIGUING...A CLASSIC NOCTURNAL RIDGE RIDER PATTERN ON THE SOUTHERN EDGE OF THE WESTERLIES OVER THE AREA. WOULD NOT BE SURPRISED TO FIND SOME AREAS WITH QUITE A BIT OF RAIN BY THE END OF NEXT WEEK...AS SETUP IS FOR BNDRY TO NOT GO TOO FAR SWRD WITH STRONG RIDGING IN SERN US. PERIODIC CONVECTION LOOKS TO BE A LARGE DRIVING FORCE BEHIND BNDRY LOCATION. SOME CONSENSUS ON WAVE MON NIGHT/EARLY TUE...WHICH SHUD INTERACT WITH E/W FRONTAL BNDRY TO PRODUCE DECENT COVERAGE OF CONVECTION STARTING ACRS SD CWA ON MON EVENING...COLLAPSING SEWRD THRU NIGHT. WL LINGER WITH BNDRY ACRS NW IA AND NERN NEBRASKA ON TUE. WHILE VERY HARD TO SAY EXACTLY WHEN THE THREAT WL DROP OFF COMPLETELY...SEEMS MOST AREAS LESS LKLY TO SEE PCPN TUE NIGHT INTO WED SOME POTENTIAL ENHANCEMENT AGAIN WED NIGHT WITH RETURN FLOW ACRS BNDRY...WITH ONLY SUBTROPICAL FLOW TO MAINTAIN AT LEAST A THREAT OF SOME ELEVATED CONVECTION THRU ERN PORTIONS OF CWA AFTER BNDRY WASHES OUT/REFOCUSES NORTHWARD. WL PLAY TEMPERATURES CLOSE TO THE VEST TODAY...AND KEEP A TYPICAL TROPICAL RANGE IN TMPS. && .AVIATION... SHWRS AFCTG W CWA THIS AFTN CREATING MVFR AT HON...BUT EXPC THAT OTR TAF SITES IN E CWA WL RMN VFR THRU AFTN. FSD AND SUX TAFS MAY NEED TO BE UPDATED TO MOV PCPN IN ERYR TNGT WITH AREA OF SHWRS CONTIG TO PROGRESS EWD. EXPC IFR CONDS WITH TSTMS BGNG IN HON AND MOVG E TO FSD BY MIDN...THEN TO SUX IN THE ERY MRNG. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && MJF/CHAPMAN/LAFLIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1248 PM CDT FRI AUG 03 2007 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-041200- 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- 1248 PM CDT FRI AUG 03 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THUNDERSTORM ACTIVITY WILL HOVER ALONG AND WEST OF A WAGNER SOUTH DAKOTA TO HURON SOUTH DAKOTA LINE THIS AFTERNOON...WITH A SLIGHT RISK OF SEVERE THUNDERSTORMS MAINLY IN SOUTH CENTRAL SOUTH DAKOTA. THE MAIN THREAT WOULD BE HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH. TONIGHT...A THUNDERSTORM COMPLEX WILL LIKELY MOVE ACROSS THE AREA. A SEVERE STORM MAY ONCE AGAIN BE POSSIBLE INITIALLY IN SOUTH CENTRAL SOUTH DAKOTA...BUT THE REST OF THE ACTIVITY SHOULD REMAIN BELOW SEVERE LIMITS AS THE ATMOSPHERE IS FAIRLY STABLE. FLOODING... A COMPLEX OF THUNDERSTORMS WILL LIKELY STRENGTHEN NEAR CENTRAL SOUTH DAKOTA LATE TODAY...AND THEN MOVE INTO EAST CENTRAL SOUTH DAKOTA THIS EVENING. AFTER EVENING...THE COMPLEX WILL TRACK EASTWARD TOWARD SOUTHWEST MINNESOTA...AS WELL AS SOME POSSIBLE DEVELOPMENT ON ITS SOUTHERN SIDE IN EXTREME SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND EXTREME NORTHEAST NEBRASKA AFTER MIDNIGHT INTO THE CRUX OF THE LOW LEVEL JET. THIS STORM COMPLEX WILL PRODUCE AREAS OF HEAVY RAINFALL. WITH ANY HEAVY RAINFALL...BE ALERT FOR URBAN FLOODING SITUATIONS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THERE WILL BE A LINGERING CHANCE OF THUNDERSTORMS ON SATURDAY EAST OF THE JAMES RIVER...BUT THESE STORMS ARE NOT EXPECTED TO BECOME SEVERE. THERE IS A SLIGHT RISK FOR SEVERE WEATHER LATE TOMORROW MORNING WITH POSSIBLE THUNDERSTORM REGENERATION EAST OF INTERSTATE 29. .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. MJF/LAFLIN
The Sioux Falls radar (KFSD), 179 km away, was scanning. The volume nearest the first event began at 23:17 UTC.
3 flash flood, 3 thunderstorm wind. Local standard time, as filed.
Heavy rain of 4 to 6 inches caused flooding of numerous roads, including most streets in the town of Kimball. Fields, yards, and a few recreational areas were also flooded.
Thunderstorm winds blew the roof off a hog confinement building and scattered debris from the roof over a field.
Heavy rain of 3 to 6 inches caused flooding of roads and fields. Basements were flooded in Stickney.
Heavy rainfall of 3 to 6 inches flooded numerous roads and fields. Yards were flooded in the town of Corsica.
Thunderstorm winds caused tree damage, including several trees blown down.
Thunderstorm winds caused widespread tree damage, including several large trees blown down, a few of which were uprooted. Much of the tree damage was at a cemetery, at which some gravestones were damaged by the wind or by falling trees. Crop damage was also reported, with the winds blowing corn over, but the amount of crop damage was not known.
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, August 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: 53780, 53784, 53794, 53796, 53797, 53881.