A large upper level low pressure system brought very heavy rains to central South Dakota. Runoff from the heavy rainfall caused the White River near Oacoma to rise above flood stage.
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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.
A large upper level low pressure system brought very heavy rains to central South Dakota. Runoff from the heavy rainfall caused the White River near Oacoma to rise above flood stage.
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 Jun 21, 8:24 PM CST, 6 hours 22 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE ABERDEEN SD 924 PM CDT TUE JUN 21 2011 .UPDATE... SHOWERS STILL OCCURRING ACROSS MOST OF THE CWA...WITH THE EXCEPTION OF THE WEST RIVER COUNTIES. THE PRECIPITATION IS NOT MAKING MUCH PROGRESS PUSHING EASTWARD...SO WILL KEEP THE MENTION OF SHOWERS IN FOR THE CENTRAL AND EASTERN CWA THROUGH THE NIGHT. NO CHANGES MADE TO WINDS OR TEMPERATURES. && .PREVIOUS DISCUSSION... .SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT REMARKABLY DEEP CLOSED UPPER LEVEL LOW CURRENTLY CENTERED NEAR/OVER FSD WILL CONTINUE TO TRANSLATE SLOWLY EWD TONIGHT. NORTH TO SOUTH DEFORMATION ZONE OVER THE MO RIVER BEGINNING TO SHOW SIGNS OF WEAKENING. THE CONVECTION OVER SWRN MN WILL LIKELY BECOME THE NEW DEFORMATION BAND OF PRECIP THAT WILL KEEP RAIN GOING EAST RIVER. CANCELLED FLASH FLOOD WARNING AND WATCH PRODUCTS GIVEN LATEST RADAR AND SATELLITE TRENDS. MODELS STILL REMAIN IN VERY GOOD AGREEMENT...EVER SO SLOWLY TRANSITIONING THE CLOSED LOW EWD THROUGH SRN MN/NRN IA WEDNESDAY MORNING. WRAP AROUND RAINFALL WILL CONTINUE FROM APPROXIMATELY THE JAMES RIVER VALLEY EAST THROUGH AROUND MID-DAY WEDNESDAY AND THEN EAST OF THE JAMES RIVER THROUGH THE AFTERNOON. HIGH AMPLITUDE RIDGE OVER THE ROCKIES BEGINS TO TRANSLATE EWD WEDNESDAY NIGHT. LOW STRATUS WITH AREAS OF DRIZZLE OR SPRINKLES LIKELY TO HANG ON EAST OF THE JAMES RIVER THROUGH THE DAY THURSDAY...FINALLY CLEARING OUT THURSDAY NIGHT. .LONG TERM...FRIDAY THROUGH TUESDAY UPPER LEVEL RIDGING TRIES TO DEVELOP DURING THE EXTENDED PERIOD WITH MUCH WARMER TEMPERATURES ADVERTISED IN THE MODELS. ALTHOUGH...MODELS STILL INDICATING RIDGE RIDING IMPULSES TRACKING ACROSS THE NORTHERN PLAINS...THUS KEEPING THE WEATHER PATTERN FAIRLY ACTIVE. KEPT LOW END POPS FOR NEARLY EVERY PERIOD IN THE EXTENDED AS MODELS WILL TAKE SOME TIME YET RESOLVING THE EMBEDDED RIDGE RIDING WAVES. && .AVIATION... TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS MVFR/IFR CIGS/VSBYS WILL CONTINUE THROUGH THE EVENING HOURS WITH WIDESPREAD RA AND BR. RA WILL TAPER OFF ACROSS KPIR/KMBG LATER THIS EVENING...BUT WILL PERSIST ACROSS KABR/KATY THRU WED MORNING. CIGS EXPECTED TO IMPROVE TO VFR ACROSS KMBG/KPIR BY EARLY WED AFTERNOON. VFR NOT EXPECTED TO REACH KABR/KATY UNTIL LATE IN THE DAY WED...PERHAPS EVEN INTO WED EVENING IN KATY. && .HYDROLOGY... THE BAD RIVER NEAR FT PIERRE CONTINUES RISING RAPIDLY FROM EXCESSIVE RUNOFF AND BACKUP FROM THE MISSOURI. LATEST STAGE AT 0130Z WAS 27.46 FT...FLOOD STAGE IS 21 FT. ALL FLASH FLOOD WARNINGS WERE CANCELLED THIS AFTERNOON AND WERE CONVERTED TO GENERAL AREAL FLOOD WARNINGS. THESE WARNINGS WERE PUT INTO EFFECT FOR 24 HOURS AND EXPANDED IN AREAL COVERAGE TO COVER MOST OF THE SOUTHWEST CWA. CALLS TO JONES/LYMAN COUNTIES CONFIRM CONDITIONS NOT QUITE AS BAD SOUTH OF I-90. ACROSS THE CURRENT WARNED AREA...EXTREMELY HEAVY RAIN OVER THE PAST TWO DAYS WITH AMOUNTS RANGING FROM 3 TO WELL OVER 7 INCHES. SEVERAL AREA CREEKS AND ROADS/HIGHWAYS ARE UNDER WATER OR THREATENED BY HIGH WATER. READINGS WERE TAKEN AT TURTLE CREEK AND SNAKE CREEK EARLIER TODAY AND MAY NEED TO BEGIN MORE REGULAR GAGE READINGS AT THESE SITES. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && UPDATE...PARKIN SHORT TERM...CHURCH LONG TERM...TMT AVIATION...PARKIN WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 552 AM CDT TUE JUN 21 2011 SDZ003>005-009-010-015>017-033>037-045-048-051-221100- CORSON-CAMPBELL-MCPHERSON-WALWORTH-EDMUNDS-DEWEY-POTTER-FAULK- STANLEY-SULLY-HUGHES-HYDE-HAND-JONES-LYMAN-BUFFALO- 552 AM CDT TUE JUN 21 2011 /452 AM MDT TUE JUN 21 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL SOUTH DAKOTA AND NORTH CENTRAL SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY INTO THIS EVENING. THE MAIN THREAT WILL BE LOCALLY HEAVY RAINFALL AS SOME THUNDERSTORMS MAY PRODUCE RAINFALL AMOUNTS IN EXCESS OF AN INCH PER HOUR. A FLASH FLOOD WATCH REMAINS IN EFFECT TODAY. A FLOOD WARNING REMAINS IN EFFECT FOR ALL OF THE MISSOURI RIVER WITHIN THIS FORECAST AREA...FROM THE NORTH DAKOTA AND SOUTH DAKOTA BORDER ALL THE WAY DOWN TO CHAMBERLAIN. THE MISSOURI RIVER AT PIERRE IS OVER SIX FEET ABOVE FLOOD STAGE...AND IS EXPECTED TO REMAIN ABOVE FLOOD STAGE FOR THE NEXT SEVERAL WEEKS DUE TO HIGH RELEASES OF WATER OUT OF GARRISON DAM IN NORTH DAKOTA AND OAHE DAM NORTH OF PIERRE. SIGNIFICANTLY ELEVATED RIVER LEVELS UP AND DOWN THE MISSOURI RIVER ARE EXPECTED. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS ARE IN THE FORECAST FRIDAY THROUGH THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED TODAY FOR REPORTS OF FLOODING OR EXCESSIVE RAINFALL AMOUNTS. MNZ039-046-SDZ006>008-011-018>023-221100- TRAVERSE-BIG STONE-BROWN-MARSHALL-ROBERTS-DAY-SPINK-CLARK- CODINGTON-GRANT-HAMLIN-DEUEL- 552 AM CDT TUE JUN 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT. WHILE SEVERE STORMS ARE NOT EXPECTED...LOCALLY HEAVY RAINFALL IS EXPECTED. A FLASH FLOOD WATCH REMAINS IN EFFECT INTO TONIGHT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS ARE IN THE FORECAST FRIDAY THROUGH THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED TODAY FOR REPORTS OF FLOODING OR EXCESSIVE RAINFALL AMOUNTS. DORN
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ABERDEEN SD
1027 PM CDT TUE JUN 21 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1000 AM FLASH FLOOD 9 N RELIANCE 44.01N 99.60W
06/21/2011 LYMAN SD LAW ENFORCEMENT
*** 2 FATAL *** TWO WOMEN DIED IN TWO SEPARATE VEHICLES
AFTER DRIVING THEIR VEHICLES ON A ROAD THAT WAS WASHED
AWAY BY HEAVY RAINFALL. OCCURRED ON BIA 10 JUST NORTH OF
THE INTERSECTION WITH HIGHWAY 47.
&&
PARKINThe national radar mosaic for the moment the first event began.
1 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 or 1.9 feet above flood stage. Flooding of agricultural land occurred.
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: 323775.