Ice break-up and several ice jams caused flooding along the White River near the Highway 47 bridge south of Reliance downstream to the Missouri River.
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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 ABR wrote it up.
Ice break-up and several ice jams caused flooding along the White River near the Highway 47 bridge south of Reliance downstream to the Missouri River.
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 Aberdeen, SD wrote its last area forecast discussion before the first event at Mar 2, 3:33 PM CST, 5 hours 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ABERDEEN SD 333 PM CST WED MAR 2 2011 .SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT TEMPERATURES ARE STAYING VERY COLD AND WELL BELOW NORMAL THIS AFTERNOON AS AS ARCTIC HIGH SITS OVER THE NORTHERN PLAINS. ALTHOUGH...THIS HIGH IS RETREATING AND THE PRESSURE GRADIENT IS TIGHTENING OUT WEST WHERE WINDS HAVE BECOME BREEZY. VERY DIFFICULT LOW TEMP FORECAST TONIGHT...WITH LOW CONFIDENCE IN FORECASTED VALUES. MID AND HIGH CLOUDS EXIST OVER THE AREA...AND WILL CONTINUE TO DO SO INTO THE EVENING HOURS. WILL ALSO SEE AN INCREASE IN LOWER CLOUDS LATER ON TONIGHT. WINDS BEGIN TO INCREASE FROM THE SOUTHEAST. TOUGH TO DETERMINE JUST HOW FAR TEMPS DROP BEFORE THEY STEADY OUT AND SLOWLY RISE LATE TONIGHT. THINK GUIDANCE IS TOO WARM AND HAVE GONE BELOW THESE NUMBERS BY SEVERAL DEGREES. WILL PROBABLY SEE A GOOD DROP OFF IN THE EAST THIS EVENING BEFORE TEMPS STEADY OUT LATER ON. JUST HOW MUCH THOUGH IS TOUGH TO DETERMINE. WITH THE WINDS ALREADY BREEZY ACROSS THE WESTERN COUNTIES...AND A WARM FRONT ACROSS SOUTH CENTRAL SD...TEMPS OVER THE SOUTHWEST COUNTIES MAY NOT DROP MUCH AT ALL THIS EVENING. WILL LIKELY NEED TEMP UPDATES LATER THIS EVENING. KEPT FREEZING DRIZZLE IN THE FORECAST...BUT SHAVED OFF FAR NORTHERN SD AND THE NORTHWEST CWA WHERE SOUNDINGS ARE NOT QUITE AS SUPPORTIVE. LOOKS LIKE ANY FZDZ THREAT WILL BE RATHER LATE...PROBABLY AFTER 09Z AND CLOSER TO 12Z. INSERTED PATCHY FOG AS WELL FOR PORTIONS OF THE AREA. AS A WEAK WAVE SLIDES ACROSS THE AREA TOMORROW...A COUPLE MODELS ARE SHOWING LIGHT SNOWFALL ACROSS WESTERN/CENTRAL SD. HAVE ADDED SLIGHT CHANCE POPS FOR THE WESTERN CWA FOR THURS AFTERNOON. WILL KEEP MENTION OF POPS GOING INTO THURS NIGHT AS WELL...MAINLY THE WESTERN CWA. FRIDAYS WAVE IS LOOKING LESS IMPRESSIVE...BUT WILL KEEP LOW END POPS IN THE FORECAST. .LONG TERM...SATURDAY THROUGH WEDNESDAY THE MOST IMPORTANT EVENT IN THE LONG TERM WILL COME EARLY NEXT WEEK. THE MODELS AND GFS ENSEMBLES CONTINUED TO SHOW SOME DISAGREEMENT IN THE TRACK AND TIMING OF A SIGNIFICANT SURFACE LOW PRESSURE AREA MOVING ACROSS THE CENTRAL AND NORTHERN PLAINS MONDAY NIGHT THROUGH TUESDAY NIGHT. NEVERTHELESS...IT DOES APPEAR LIKELY THAT A SIGNIFICANT STORM SYSTEM WILL BE MOVING ACROSS THE CENTRAL PART OF THE US DURING THIS TIME PERIOD. THE MODELS WERE CLOSE WITH THE LOCATION OF THE SURFACE LOW PRESSURE AREA ON MONDAY NIGHT/EARLY TUESDAY IN THE EASTERN CO/WESTERN KANSAS AREA. THE EC AND GFS THEN DIVERGE IN THE TRACK OF THE SURFACE LOW PRESSURE AREA AS IT LIFTS NORTHEAST. BEFORE THIS ALL OCCURS...THE MODELS SHOW SEVERAL DECENT SHORT WAVE TROUGHS MOVING ACROSS THE REGION SATURDAY THROUGH MONDAY NIGHT. THE LATER SATURDAY NIGHT AND SUNDAY AND MONDAY AND MONDAY NIGHT SYSTEMS COULD BRING US SOME DECENT SNOW ACCUMULATIONS BEFORE THE MAIN SYSTEM AFFECTS THE REGION LATER MONDAY NIGHT THROUGH TUESDAY NIGHT. HAVE INSERTED POPS IN SEVERAL PERIODS AND INCREASED POPS MAINLY FOR THE MONDAY THROUGH TUESDAY PERIODS. TEMPERATURES WILL REMAIN WELL BELOW NORMAL THROUGH THE PERIOD. && .AVIATION... TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS VFR HIGH LEVEL CLOUDS WILL CONTINUE TO TRAVERSE OVER THE TAF SITES THROUGH THE AFTERNOON AND EVENING. SOUTHEAST WINDS OVER THE WIDESPREAD SNOW COVER WILL RESULT IN MVFR/IFR STRATUS CLOUDS FORMING/MOVING IN ALONG WITH SOME FOG LATER TONIGHT AND THURSDAY MORNING. WILL ALSO HAVE TO WATCH FOR SOME FREEZING DRIZZLE POSSIBILITIES WITH THIS SOUTHEAST FLOW. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && SHORT TERM...TMT LONG TERM...MOHR AVIATION...MOHR WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 410 AM CST WED MAR 2 2011 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-031015- TRAVERSE-BIG STONE-CORSON-CAMPBELL-MCPHERSON-BROWN-MARSHALL- ROBERTS-WALWORTH-EDMUNDS-DAY-DEWEY-POTTER-FAULK-SPINK-CLARK- CODINGTON-GRANT-HAMLIN-DEUEL-STANLEY-SULLY-HUGHES-HYDE-HAND-JONES- LYMAN-BUFFALO- 410 AM CST WED MAR 2 2011 /310 AM MST WED MAR 2 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL MINNESOTA...CENTRAL SOUTH DAKOTA...NORTH CENTRAL SOUTH DAKOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT LIGHT FREEZING DRIZZLE IS POSSIBLE LATE TONIGHT AND EARLY THURSDAY MORNING...WITH THE INTERSTATE 29 CORRIDOR AND POINTS EAST MAINTAINING THE GREATEST POTENTIAL FOR SEEING A LIGHT COATING OF ICE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY FORECAST MODELS CURRENTLY SUGGEST A LARGE WINTER STORM MAY BE POSSIBLE ACROSS THE CENTRAL AND NORTHERN PLAINS NEXT MONDAY NIGHT THROUGH TUESDAY NIGHT. HOWEVER...SYSTEM TIMING AND TRACK DETAILS STILL REQUIRE FURTHER REFINEMENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. DORN
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Minor flooding occurred along the White River. The river gage southwest of Oacoma along Highway 47 crested at 16.9 feet of 1.9 feet above flood stage. Flooding of agricultural land occurred.
Moderate flooding occurred along the White River. The river gage southwest of Oacoma along Highway 47 crested at 23.0 feet or 8.0 feet above flood stage. At least one home was threatened by the flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2011Every state in 2011This day in weather historyWarnings in South Dakota, March 2011
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: 293806, 293809.