Thunderstorms produced heavy rain which caused flash flooding in Brookings County during the predawn hours of September 2nd.
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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 in Brookings County during the predawn hours of September 2nd.
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 Sep 2, 2:45 AM CST, 0 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 345 AM CDT THU SEP 2 2010 .DISCUSSION... UPPER LEVEL WAVE AND LOW LEVEL JET DRIVING MUCH OF THE THUNDERSTORM ACTIVITY THIS MORNING. SOME VERY HEAVY RAIN HAS FALLEN ACROSS BROOKINGS...LINCOLN...AND MARSHALL COUNTIES NEAR HIGHWAY 14 THIS MORNING...AS STORMS TRAINED OVER THIS AREA. THUNDERSTORM ACTIVITY IS EXPECTED TO BE EAST OF THE FORECAST AREA BY MID MORNING...IF NOT EARLIER...AS STRONGEST UPPER FORCING AND LOW LEVEL JET MOVE INTO EASTERN MN AND IA. SEVERE WEATHER THREAT WILL CONTINUE UNTIL THE LINE OF THUNDERSTORMS MOVE EAST OF THE AREA THIS MORNING. MAINLY LOOKING AT MARGINAL SEVERE HAIL WITH THE STRONGER STORMS. MAY SEE SOME ISOLATED SHOWER ACTIVITY LINGER BEHIND THE MAIN LINE OF STORMS THIS MORNING...BUT THAT ACTIVITY WILL SHUT OFF AS SUBSIDENCE SETS IN AND THE ATMOSPHERE STABILIZES. MOST OF THE AREA SHOULD SEE A PERIOD OF SUNSHINE BY LATER THIS MORNING OR EARLY AFTERNOON. THIS WILL SET THE STAGE FOR SOME ISOLATED TO SCATTERED SHOWERS MID TO LATE AFTERNOON. STEEP LAPSE RATES WILL DEVELOP AS A COLD POCKET OF AIR SLIDES OVER THE AREA. 700 MB TEMPS WILL DROP TO AROUND 0 DEG C AND 500 MB TEMPS MINUS 15 TO MINU 20 DEG C. MOISTURE WILL GENERALLY BE LACKING SOUTH OF I90...SO NOT MUCH MORE THAN ISOLATED LIGHT SHOWERS. FARTHER NORTH...DYNAMICS SHOULD BE A BIT STRONG AND CERTAINLY COOLER WITH MORE MOISTURE... SUCH THAT COULD SEE A RUMBELS OF THUNDER. SEVERE THUNDERSTORMS ARE NOT EXPECTED THIS AFTERNOON...BUT INVERTED V SOUNDINGS AND 40+ KTS ALOFT COULD MIX TO THE SFC...PRODUCING GUSTS 40 TO 50 MPH. ISSUED A WIND ADVISORY FOR WESTERN SECTIONS OF THE CWA THIS AFTERNOON. LIKE USUAL...SHOULD BE A MARGINAL EVENT...WITH SUSTAINED WINDS AROUND 30 MPH AND A FEW GUSTS OF 40 TO 45 MPH. THE ATMOSPHERE WILL RAPIDLY STABILZE THIS EVENING...BRINGING AN END TO ANY SHOWER OR THUNDESTORMS. MAY SEE A LINGERING SHOWER IN SW MN THROUGH 8 OR 9 PM...BUT THAT IS ABOUT IT FOR THIS EVENING. HIGH PRESSURE WILL BUILD IN OVER THE NEXT FEW DAYS...KEEPING THINGS ON THE DRY SIDE THROUGH THE WEEKEND. /97 && .AVIATION... IN THE NEAR TERM...TSRA DEVELOPMENT IS THE OBVIOUS CONCERN...MAINLY ALONG THE INTERSTATE 29 CORRIDOR AND EWD. TWO AREAS OF CONCENTRATED STORM ACTIVITY WILL AFFECT THE NRN PORTIONS OF SW MN...AND ALSO TO THE SOUTH OF I 90. SCATTERED DEVELOPMENT IS POSSIBLE ELSEWHERE. ALL OF THIS ACTIVITY IS PUSHING OFF TO THE EAST BUT WILL BE A CONCERN FOR SW MN AND NW IA THRU AROUND 12Z. IN ANY OF THIS TSRA ACTIVITY... SHORT TERM IFR TO LIFR CONDS ARE LIKELY. IN ADDITION...EVEN AFTER THE RAINFALL ENDS...MVFR STRATUS MAY LINGER UNTIL SHORTLY AFT SUNRISE IN AREAS FM I 29 AND EWD. FM ABOUT 15Z ONWARD...CONDS SHOULD BE VFR ACROSS THE ENTIRE FSD FA. BUT W TO NW WINDS GUSTING TO OVER 25 MPH IS PROBABLE FOR THE MIDDAY AND AFTERNOON HOURS. THE WINDS WL SUBSIDE SOME THIS EVENING WITH VFR STILL PREVAILING. /MJF && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1138 AM CDT WED SEP 01 2010 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-021200- 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- 1138 AM CDT WED SEP 01 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... THUNDERSTORMS ARE EXPECTED TO MOVE ACROSS THE AREA THIS EVENING INTO TONIGHT. SOME OF THE STRONGER STORMS MAY BE CAPABLE OF PRODUCING 60 MPH WINDS AND HAIL TO THE SIZE OF QUARTERS. FLOODING... LOWLAND FLOODING WILL CONTINUE ALONG PORTIONS OF THE MISSOURI RIVER BETWEEN FORT RANDALL DAM AND LEWIS AND CLARK LAKE FOR THE NEXT COUPLE OF WEEKS. WIND AND FOG... SOUTH WINDS WILL AVERAGE 20 TO 35 MPH INTO EARLY EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE POSSIBLE AFTER 5 PM. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1023 PM CDT WED SEP 01 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1017 PM HAIL 17 S PUKWANA 43.53N 99.17W
09/01/2010 E1.00 INCH BRULE SD TRAINED SPOTTER
&&
LAFLINThe Sioux Falls radar (KFSD), 93 km away, was scanning. The volume nearest the first event began at 08:43 UTC.
2 flash flood. Local standard time, as filed.
Heavy rainfall of over 5 inches caused flash flooding of numerous roads, with a few secondary roads partially washed out. Fields, ditches, and other low areas were flooded.
Heavy rain caused flash flooding of numerous roads, including several along Six Mile Creek.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2010Every state in 2010This day in weather historyWarnings in South Dakota, September 2010
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: 261042, 261044.