Several ice jams caused flooding along the White River along the Tripp County line 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 UNR wrote it up.
Several ice jams caused flooding along the White River along the Tripp County line 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 Rapid City, SD wrote its last area forecast discussion before the first event at Mar 2, 7:20 PM CST, 1 hour 25 minutes earlier.
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 620 PM MST WED MAR 2 2011 .DISCUSSION...CURRENT SURFACE ANALYSIS PLACES HIGH OVER MINNESOTA ARROWHEAD WHILE WARM FRONT REMAINS DRAPED OVER EASTERN WYOMING INTO SOUTHWEST SOUTH DAKOTA. LARGE TEMPERATURE GRADIENT REMAINS OVER THE AREA...WITH TEMPS RANGING FROM MID 30S OVER SOUTHWEST SOUTH DAKOTA/ THE BLACK HILLS AND PORTIONS OF NERN WYOMING TO NEAR ZERO FROM KRAP TO KPHP AND AREAS NORTH. HAVE UPDATED FORECAST TO LOW MIN TEMPS ON SOUTH DAKOTA PLAINS AND EXPECT STEADY TO SLOWLY RISING TEMPS AS WARM FRONT STARTS TO SLOWLY SHIFT OVER THE AREA. SOME PATCHY FOG REMAINS POSSIBLE OVER THE SOUTH DAKOTA PLAINS...ESPECIALLY OVER SOUTH CENTRAL SOUTH DAKOTA. PREVIOUS FORECAST DISCUSSION:(220 PM MST)... ON THURSDAY...ZONAL FLOW SETS UP OVER THE AREA WITH TEMPERATURES WARMING TO NEAR AVERAGE OVER MOST LOCATIONS. A WEAK SHORT WAVE MOVES THROUGH EARLIER IN THE DAY POSSIBLY BRINGING SOME LIGHT RAIN/SNOW WITH A STRONGER WAVE APPROACHING TOWARDS EVENING...BRINGING BETTER CHANCES FOR PRECIP. FOR FRIDAY...INITIAL SHORT WAVE SLIDES THROUGH THOUGH SECONDARY SHORT WAVE FOLLOWS IN BEHIND...BRINGING A CONTINUED CHANCE OF LIGHT SNOW THROUGH THE DAY INTO THE EVENING. SLIGHTLY BELOW AVERAGE TEMPS ARE EXPECTED. EXTENDED...A 500MB RIDGE AND ASSOCIATED UPPER-LEVEL SUBSIDENCE WILL PUSH THROUGH THE CWA SATURDAY BRINGING QUIET CONDITIONS. TEMPERATURES WILL REMAIN BELOW NORMAL MAINLY ACROSS THE SD PLAINS. ANOTHER SMALL SHORTWAVE MOVES THROUGH THE ZONAL FLOW ALOFT SATURDAY NIGHT AS WARMER AIR REMAINS THE AREA. SINCE THE WAVE WILL BE FAST MOVING...QPF IS EXPECTED TO BE MINIMAL WITH ONLY A FEW SNOW SHOWERS ACROSS THE REGION. THE LARGE-SCALE PATTERN SHIFTS SIGNIFICANTLY SUNDAY NIGHT AND MONDAY WITH A DEEP TROUGH BUILDING INTO THE WESTERN US. YET ANOTHER QUICK SHORTWAVE PASSES OVER THE CWA MONDAY...ALTHOUGH ITS EFFECT IS PARTIALLY MASKED BY FALLING HEIGHTS SPREADING PRECIP OVER A LARGE PORTION OF THE WESTERN US IN ADVANCE OF THE DEVELOPING LONGWAVE TROUGH. THE LATEST RUNS OF THE ECMWF AND GFS SHOW SOME SIGNIFICANT DIFFERENCES WITH THE TRACK OF THE 500MB LOW. THE ECMWF BRING THE LOW TO SOUTH CENTRAL SOUTH DAKOTA. IT SEEMS AS THOUGH THE 12Z RUN IS A TAD FARTHER EAST THAN THE 00Z LAST NIGHT...BUT THIS SOLUTION WOULD STILL BRING SIGNIFICANT SNOW AMOUNTS TO THE AREA. THE 12Z GFS TAKES THE LOW MUCH FARTHER SOUTH...ACROSS CENTRAL TO EASTERN NEBRASKA. THIS IS FARTHER SOUTH THAN THE 06Z RUN...AND BRINGS THE MAIN TROWAL ACROSS NEBRASKA AS OPPOSED TO THE SD/NE BORDER LIKE THE PAST SEVERAL RUNS HAVE SHOWN. HAVE INCREASE POPS TO LIKELY ACROSS THE SOUTHERN PARTS OF THE CWA...BUT THE EXPECTED IMPACT TO THE CWA IS STILL LARGELY UNKNOWN GIVEN THE DISCREPANCIES IN MODEL SOLUTIONS. && .AVIATION...AREAS OF MVFR/IFR CIGS ARE EXPECTED TONIGHT ACROSS NORTHWEST SOUTH DAKOTA AND PARTS OF THE WEST CENTRAL SOUTH DAKOTA PLAINS. SOME IMPROVEMENT IN CIGS ARE EXPECTED THROUGH THURSDAY MORNING. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 327 AM MST WED MAR 2 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-031400- BENNETT-BUTTE-CENTRAL BLACK HILLS-CUSTER CO PLAINS-FALL RIVER-HAAKON- HARDING-HERMOSA FOOT HILLS-JACKSON-MELLETTE-NORTHEASTERN CROOK- NORTHERN BLACK HILLS-NORTHERN CAMPBELL-NORTHERN FOOT HILLS- NORTHERN MEADE CO PLAINS-PENNINGTON CO PLAINS-PERKINS-RAPID CITY- SHANNON-SOUTHERN BLACK HILLS-SOUTHERN CAMPBELL-SOUTHERN FOOT HILLS- SOUTHERN MEADE CO PLAINS-STURGIS/PIEDMONT FOOT HILLS-TODD-TRIPP- WESTERN CROOK-WESTON-WYOMING BLACK HILLS-ZIEBACH- 327 AM MST (427 AM CST) WED MAR 2 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT A BIT OF FREEZING FOG MAY FORM LATER TONIGHT ON THE SOUTH DAKOTA PLAINS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A WEAK STORM SYSTEM MAY BRING AN INCH OR TWO OF SNOW TO PORTIONS OF NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA FRIDAY. A STRONG STORM SYSTEM IS EXPECTED TO CROSS THE CENTRAL PLAINS MONDAY THROUGH TUESDAY. DEPENDING ON THE TRACK OF THIS STORM...THIS SYSTEM MAY BRING SIGNIFICANT SNOW TO THE AREA. HOWEVER...UNCERTAINTY REMAINS AT THIS TIME REGARDING THE TRACK AND TIMING OF THE STORM. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Minor flooding of agricultural land occurred along the White River. The river gage southwest of Oacoma along highway 47 crested at 16.9 feet, or 1.9 feet above flood stage.
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: 284259.