Runoff from heavy rain caused flooding along the White 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.
Runoff from heavy rain caused flooding along the White 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 Jun 21, 9:22 PM CST, 5 hours 24 minutes earlier.
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY NATIONAL WEATHER SERVICE RAPID CITY SD 922 PM MDT TUE JUN 21 2011 .DISCUSSION...VERY NARROW BAND OF SHOWERS THAT EXTEND FROM SOUTHWESTERN SASKATCHEWAN...TO THE RAPID CITY AREA...AND THEN INTO CENTRAL MONTANA ARE VERY GRADUALLY ENDING THIS EVENING...DUE TO THE LOSS OF DIURNAL HEATING. STEADIER RAIN THAT HAS BEEN FALLING OVER TRIPP COUNTY IN SOUTH CENTRAL SOUTH DAKOTA IS GRADUALLY SHIFTING EAST AND WILL MOVE OUT OF OUR FORECAST AREA COMPLETELY BEFORE MIDNIGHT. HAVE UPDATED THE FORECAST TO BETTER REFLECT THESE ISSUES. && .AVIATION...ISOLATED SHOWERS WILL CONTINUE TO DIMINISH THIS EVENING. VFR CONDITIONS EXPECTED OVERNIGHT WITH DECREASING CLOUDS. && .PREV DISCUSSION... /ISSUED 258 PM MDT TUE JUN 21 2011/ DISCUSSION...WATER VAPOR IMAGERY SHOWS LARGE STORM SYSTEM STRETCHING FROM THE NORTHERN PLAINS TO THE MISSOURI RIVER VALLEY...WITH UPPER RIDGING BUILDING ACROSS THE WESTERN CONUS. SURFACE ANALYSIS SHOWS STRONG LOW PRESSURE ACROSS SOUTHWESTERN MINNESOTA. A GRADUALLY WEAKENING PRESSURE GRADIENT IS ACROSS THE HIGH PLAINS AS HIGH PRESSURE APPROACHES FROM THE NORTHERN ROCKIES. DIURNALLY DRIVEN SHOWERS ACROSS THE CWA WILL QUICKLY DISSIPATE EARLY THIS EVENING NEAR SUNSET. OTHERWISE QUIET WEATHER IS EXPECTED OVERNIGHT AS SKIES WILL CLEAR FROM WEST TO EAST. LOWS WILL BE IN THE MID 40S TO MID 50S. MOSTLY SUNNY SKIES AND DRY WEATHER IS EXPECTED WEDNESDAY AS UPPER RIDGING AND SURFACE HIGH PRESSURE BUILDS ACROSS THE REGION. HIGHS WILL BE IN THE 70S TO AROUND 80. UPPER RIDGE AXIS WILL CROSS THE HIGH PLAINS THURSDAY WITH RETURN SOUTHERLY FLOW DEVELOPING IN THE AFTERNOON. WITH THETA E ADVECTING BACK IN AND MODELS SHOWING A FEW WEAK WAVES CROSSING THE REGION IN THE AFTERNOON/EVENING...COULD SEE A FEW STORMS DEVELOP FROM FAR WESTERN SOUTH DAKOTA INTO NORTHEAST WYOMING. STRONG THETA E ADVECTION WILL CONTINUE OVERNIGHT AS A LOW LEVEL JET SETS UP. THIS MAY BRING CONTINUED CHANCES FOR STORMS THROUGH THE OVERNIGHT HOURS THURSDAY. EXTENDED...ACTIVE SOUTHWEST UPPER FLOW WILL DOMINATE THE WEATHER FRIDAY THROUGH TUESDAY. DAILY CHANCES FOR TSRA ARE FORESEEN. TEMPERATURES WILL BE BE NEAR SEASONAL LEVELS THROUGH THE WEEKEND...BUT THERE ARE SIGNS A SIGNIFICANT THERMAL RIDGE WILL DEVELOP BY THE MIDDLE OF NEXT WEEK GIVING US OUR FIRST SIGNIFICANT BOUT OF HEAT FOR THE YEAR. && .UNR WATCHES/WARNINGS/ADVISORIES... SD...NONE. WY...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RAPID CITY SD 631 AM MDT TUE JUN 21 2011 SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058- 071-221300- 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- 631 AM MDT (731 AM CDT) TUE JUN 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING. .DAY ONE...TODAY AND TONIGHT AN ISOLATED THUNDERSTORM OR TWO IS POSSIBLE FROM THE BLACK HILLS AREA...EASTWARD INTO CENTRAL SOUTH DAKOTA TODAY. SEVERE THUNDERSTORMS ARE NOT EXPECTED. WINDY CONDITIONS WILL DEVELOP ACROSS MUCH OF THE WESTERN AND SOUTH CENTRAL SOUTH DAKOTA PLAINS EARLY THIS MORNING AND PERSIST THROUGH THE AFTERNOON. NORTHWESTERLY WINDS OF 15 TO 30 MPH...WITH GUSTS TO AROUND 40 MPH...ARE ANTICIPATED. THE STRONGEST WINDS WILL BE FROM THE RAPID CITY AREA...SOUTHEASTWARD INTO SOUTH CENTRAL SOUTH DAKOTA. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY CHANCES FOR THUNDERSTORMS CAN BE EXPECTED FROM THURSDAY NIGHT THROUGH THE WEEKEND AS A SERIES OF DISTURBANCES CROSS THE REGION. .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.
Heavy rain caused minor flooding of agricultural land along the White River. The river gage southwest of Oacoma crested at 16.9 feet, 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, June 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: 328235.