Thunderstorms along a warm front produced very heavy rain across Codington and Grant counties which resulted in flash flooding.
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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.
Thunderstorms along a warm front produced very heavy rain across Codington and Grant counties which resulted in flash flooding.
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 19, 11:39 PM CST, 1 hour 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ABERDEEN SD 1239 AM CDT WED JUN 20 2012 .UPDATE... SEE UPDATED AVIATION DISCUSSION FOR 06 TAFS BELOW. SEVERE WATCH NUMBER 415 HAS BEEN ISSUED FOR A CENTRAL AND NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA UNTIL 5 AM CDT. INCREASED LARGE SCALE ASCENT ASSOCIATED WITH AN UPPER LEVEL SHORTWAVE HAS INTENSIFIED STORMS ALONG THE SURFACE FRONT. THIS REGION IS STILL QUITE UNSTABLE WITH MU CAPES IN THE 500 - 1000 J/KG RANGE...AND EFFECTIVE BULK SHEAR VALUES AROUND 50 KTS. THE SETUP IS LIKELY CONDUCIVE FOR LARGE HAIL AND DAMAGING WINDS. && .PREVIOUS DISCUSSION... .SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT THUNDERSTORM CHANCES STILL POSE THE BIGGEST CHALLENGE IN THE SHORT RANGE. FOR TNT SFC LOW NEAR KMHE WILL CONTINUE TO TRACK NORTHEAST TOWARD WEST CENTRAL MN. PER SAT PIX...THE WARM FRONT ASSOCIATED WITH THE LOW HAS MOVED NORTH OF KHON/KBKX AND INTO THE SOUTHEAST CWA NEAR KATY. DEWPOINTS ON THE WARM SIDE OF THE FRONT ARE NEAR 70. MEANWHILE ELEVATED MIXED LAYER HAS BROUGHT VERY WARM AIR NORTH INTO THE EASTERN CWA WITH H7 TEMPS GREATER THAN +12C OVER MOST OF THAT REGION. 19Z SPC MESO PAGE INDICATES A WEALTH OF REMAINING MLCIN TO OVERCOME...BUT SUSPECT WITH CONTINUED DIABATIC HEATING AND CONTINUED CONVERGENCE NEAR FRONTAL BOUNDARY WE SHOULD BE ABLE TO GET CONVECTION TO FIRE. THE STORMS WILL HAVE PLENTY OF SHEAR TO WORK WITH...AND IF THEY CAN GET SFC BASED THEY WILL LIKELY BE SEVERE. ALSO FOR LATER IN THE NIGHT A NICE AREA OF POST FRONTAL UVM IS EXPECTED TO SPREAD ACROSS THE SOUTHERN/EASTERN CWA...WITH A FAIRLY DECENT SIZE BATCH OF SHOWERS/STORMS DEVELOPING. HOPEFULLY THIS PROGNOSTICATION WILL HOLD TRUE AND THOSE THAT HAVE BEEN DRY WILL GET SOME DECENT AMOUNTS OUT OF THIS SYSTEM. FOR WEDNESDAY MOST OF THE RAIN PRESSES OFF TO THE EAST...BUT WITH DIABATIC HEATING ON WEDNESDAY AFTERNOON WE WILL PROBABLY GET SOME DIURNALLY DRIVEN SHOWERS/STORMS GIVEN STEEP LAPSE RATE ENVIRONMENT AND UP TO A COUPLE HUNDRED JOULES/KG OF MLCAPE. THE SAME COULD HAPPEN FOR THURSDAY BUT FOR NOW HAVE KEPT IT DRY. TEMPERATURES SHOULD AVERAGE NEAR TO JUST BELOW NORMAL THE NEXT FEW DAYS. .LONG TERM...FRIDAY THROUGH TUESDAY FRIDAY AND FRIDAY NIGHT A WARM FRONT WILL BE IN THE AREA WITH A SFC LOW OVER THE HIGH PLAINS. ANY THUNDERSTORM CHANCES ON FRIDAY SHOULD BE CONFINED TO WESTERN SOUTH DAKOTA BUT THESE CHANCES WILL SHIFT EAST AND INCREASE QUITE A BIT FRIDAY NIGHT AS LOW LEVEL JET INTENSIFIES DURING THE OVERNIGHT HOURS INTO CENTRAL AND EASTERN SOUTH DAKOTA. FOR THE LATTER HALF OF THE WEEKEND AND INTO EARLY NEXT WEEK MODELS ARE SHOWING A SURFACE RIDGE AXIS POKING SOUTHWARD ACROSS THE EASTERN DAKOTAS...MINNESOTA...AND INTO WISCONSIN. THIS SHOULD HELP KEEP MUCH OF THE AREA FAIRLY STABLE THROUGH THIS PERIOD. && .AVIATION... 06Z TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS THUNDERSTORM DEVELOPMENT WILL CONTINUE ALONG A SURFACE FRONT ACROSS CENTRAL AND NORTHEAST SOUTH DAKOTA AND WEST CENTRAL MINNESOTA. MVFR TO IFR CIGS AND VSBYS ARE POSSIBLE WITH THUNDERSTORMS...MAINLY FOR KATY AND KPIR TAF SITES THROUGH ABOUT 10Z. ADDITIONAL STRATUS AND RAIN SHOWERS WILL FILL IN BEHIND THIS FRONT...SO MVFR CIGS WILL LIKELY STAY PUT THROUGH WEDNESDAY MORNING. ISOLATED SHOWERS ASSOCIATED WITH COOLING ALOFT ARE ALSO POSSIBLE WEDNESDAY AFTERNOON ACROSS THE REGION. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && UPDATE...SERR SHORT TERM...TDK LONG TERM...TMT AVIATION...SERR WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 411 AM CDT TUE JUN 19 2012 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-200915- 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- 411 AM CDT TUE JUN 19 2012 /311 AM MDT TUE JUN 19 2012/ 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 SHOWERS AND THUNDERSTORMS WILL CONTINUE NORTH OF A WARM FRONT THIS MORNING...MAINLY ACROSS NORTHEASTERN SOUTH DAKOTA AND WEST CENTRAL MINNESOTA. STRONG WINDS AND LARGE HAIL WILL BE THE MAIN THREATS. LATER THIS AFTERNOON AND EVENING ANOTHER ROUND OF THUNDERSTORMS ARE POSSIBLE ALONG A COLD FRONT...AGAIN FOR NORTHEASTERN SOUTH DAKOTA AND WEST CENTRAL MINNESOTA...SOME STORMS MAY BECOME STRONG. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE NEXT CHANCE FOR THUNDERSTORM DEVELOPMENT WILL BE THIS WEEKEND. NO SEVERE WEATHER IS ANTICIPATED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. SERR
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 1017 PM CDT TUE JUN 19 2012 MNZ039-200400- TRAVERSE- 1017 PM CDT TUE JUN 19 2012 ...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHEASTERN TRAVERSE COUNTY UNTIL 1100 PM CDT... AT 1011 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR COLLIS...OR 9 MILES SOUTH OF WHEATON... MOVING NORTHEAST AT 20 MPH. A FEW LOCATIONS IN THE ADVISORY INCLUDE DUMONT. PENNY TO NICKEL SIZE HAIL...ALONG WITH HEAVY RAIN AND WINDS AROUND 40 TO 50 MPH ARE EXPECTED WITH THIS STORM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT WEDNESDAY MORNING FOR WEST CENTRAL MINNESOTA AND NORTHEAST SOUTH DAKOTA. && DORN
The Aberdeen radar (KABR), 115 km away, was scanning. The volume nearest the first event began at 07:15 UTC.
4 flash flood. Local standard time, as filed.
Heavy rainfall caused a lot of road and street flooding in and around Watertown.
Heavy rain caused flash flooding of a county road west of Milbank.
Heavy rain caused flash flooding of another county road southwest of Milbank.
Three to four inches of rain caused a washout in a road near Stockholm.
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, June 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: 393834, 393835, 393836, 393837.