Heavy rain caused minor flooding of Split Rock Creek near Corson South Dakota on May 7th and 8th, 2012.
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The episode as NWS FSD wrote it up.
Heavy rain caused minor flooding of Split Rock Creek near Corson South Dakota on May 7th and 8th, 2012.
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 May 7, 2:16 AM CST, 3 hours 44 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 315 AM CDT MON MAY76 2012 .DISCUSSION.../ISSUED AT 315 AM CDT/ SKIES CLEAR ACROSS MOST OF CWA EXCEPT FOR SOME HIGHS CLOUDS OVER NORTHWEST IOWA AND MID CLOUDS MOVING EAST ALONG AND SOUTH OF MISSOURI RIVER. WITH MID LEVEL FLOW BECOMING NORTHWEST WOULD EXPECT MID CLOUDS TO GENERALLY STAY SOUTH OF CWA WHILE HIGHER CLOUDS SHIFT TO THE EAST. SO WILL START OUT WITH SOME CLOUDS ACROSS EXTEME SOUTH AND EAST EARLY THIS MORNING. UPPER LOW ALONG THE ND/CANADA BORDER WILL TRACK SLOWLY EAST SOUTHEAST TODAY THROUGH TUESDAY WITH H85 COLD AIR ADVCETION ACROSS THE CWA. SO WOULD EXPECT SOME CUMULUS TO DEVELOP ACROSS THE NORTHEAST CWA BY AFTERNOON WITH THIS TYPE OF PATTERN. ALSO SHOULD MIX OUT WELL TO PRODUCE NORTHWEST WINDS OF 20 TO 35 MPH. TEMPERATURES WILL MIX OUT INTO THE 60S FOR HIGHS TODAY. AS UPPER LOW BEGINS TO TRACK A LITTLE MORE SOUTHEAST TONIGHT...IMPULSE WRAPPING SOUTHEAST AROUND UPPER LOW WILL SPREAD CLOUDS IN FROM THE NORTH TONIGHT INTO TUESDAY WITH COOLER TEMPERATURES EXPECTED. ALSO WITH FAIRLY UNSTABLE SOUNDINGS ACROSS EASTERN CWA ON TUESDAY...WILL LIKELY SEE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS DEVELOPING ACROSS EASTERN CWA BY AFTERNOON. NOT EXPECTING SEVERE WEATHER BUT COULD SEE SOME GUSTY WINDS WITH THE SHOWERS WITH INVERTED VEE SOUNDINGS. WILL BE BREEZY ANYWAY WITH THE NORTHWEST GRADIENT. WITH THE CLOUD COVER AND SCATTERED SHOWERS...SOUTHWEST MINNESOTA WILL LIKELY NOT GET ABOVE 60 FOR HIGHS WITH LOWER TO MID 60S ELSEWHERE AT BEST. SURFACE HIGH WILL SETTLE OVER CWA TUESDAY NIGHT AND SHOULD CLEAR SKIES OUT MOST PLACES...BUT WILL LINGER A BIT EAST OF I29. RIDGE AXIS WILL SHIFT EAST ACROSS CWA ON WEDNESDAY AND WILL SEE LESS WIND AND MORE SUNSHINE...ALONG WITH SLIGHTLY WARMER TEMPERATURES. WARM AIR ADVECTION KICKS IN ON THURSDAY AHEAD OF NEXT COLD FRONT. TEMPERATURES WILL WARM INTO THE 70S TO LOWER 80S ALONG WITH AN INCREASE IN SOUTH WINDS. LOW LEVEL MOISTURE WILL RETURN AHEAD OF THIS FRONT WITH DEWPOINTS RISING INTO 50S AHEAD OF THIS FRONT. DECENT SHORT WAVE ASSOCIATED WITH THIS FRONT BUT QUESTION IS IF CWA WILL BE CAPPED OFF WITH SOUTHWEST FLOW IN THE MID LEVELS. BOTH EC AND GFS HINT THAT THIS MAY BE THE CASE...SO FOR NOW WILL ONLY GO WITH SMALL POPS THURSDAY NIGHT WITH THIS FRONT WITH LINGERING CHANCE BEHIND THE FRONT ON FRIDAY. COOLER AIR WILL ALSO SPREAD SOUTHEAST ACROSS CWA THURSDAY NIGHT...WITH HIGHS ON FRIDAY 10 TO 15 DEGREES COOLER THAN THURSDAY. NEXT WEEKEND LOOKS DRY AND PLEASANT WITH NEAR NORMAL TEMPERATURES. && .AVIATION.../FOR THE 06Z TAF ISSUANCE/ VFR SHOULD CONTINUE THROUGH 08/06Z WITH NO CEILINGS OR VISIBILITY RESTRICTIONS. INFLUX OF STEADILY DRIER LOW LEVEL AIR WILL PREVENT EVEN MINIMAL EARLY MORNING FOG. ANY APPROACH OF LOWERING CEILINGS FROM THE NORTH SHOULD BE WELL AFTER FORECAST PERIOD. A FEW SURFACE GUSTS AROUND 25 KNOTS FROM THE NORTHWEST 15Z-22Z. && && .FSD WATCHES/WARNINGS/ADVISORIES... IA...NONE. MN...NONE. NE...NONE. SD...NONE.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 352 AM CDT MON MAY 07 2012 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-081200- 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- 352 AM CDT MON MAY 07 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT FLOODING... HEAVY RAINS FROM THIS WEEKEND WILL PRODUCE FLOODING ALONG THE BIG SIOUX...JAMES...VERMILLION...LITTLE SIOUX...REDWOOD AND ROCK RIVERS. FLOODING WILL ALSO OCCUR ALONG SPLIT ROCK CREEK. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. 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.
Heavy rain caused minor lowland flooding of Split Rock Creek. The creek crested at 1.98 feet above flood stage on May 7th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2012Every state in 2012This day in weather historyWarnings in South Dakota, May 2012
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: 384511.