A microburst occurred from a severe thunderstorm in the Rosholt area with estimated winds at seventy mph or higher. The severe winds downed several trees and flattened quite a bit of crops.
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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 microburst occurred from a severe thunderstorm in the Rosholt area with estimated winds at seventy mph or higher. The severe winds downed several trees and flattened quite a bit of crops.
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 Jul 8, 5:29 PM CST, 1 hour 16 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE ABERDEEN SD 629 PM CDT SUN JUL 8 2012 .UPDATE... 00Z AVIATION DISCUSSION UPDATED BELOW. && .SHORT TERM...TONIGHT THROUGH TUESDAY NIGHT WEAK FRONTAL BOUNDARY CURRENTLY FROM NEAR BIS TO FAR WITH ISO STORMS ALONG AND AHEAD OF THIS FRONT...PRETTY MUCH WHAT MODELS HAD BEEN SHOWING FOR THE PAST COUPLE DAYS. THROUGH THE REST OF THE AFTERNOON AND EVENING STILL EXPECT ISO/WDLY SCT THUNDERSHOWERS TO FORM/MOVE ACROSS THE FAR NORTHEAST CWA AND OVER WEST CENTRAL MINNESOTA. NOT EXPECTING ANY SEVERE STORMS BUT COULD SEE SOME SMALL HAIL WITH ANY STRONGER CORES. BEST INSTABILITY CURRENTLY RESIDES ACROSS SOUTHEAST NORTH DAKOTA AND FAR NORTHEAST SOUTH DAKOTA WHERE ABOUT 1000 J/KG SNEAKS INTO ROBERTS AND TRAVERSE COUNTIES. NOT REALLY ANY SHEAR TO SPEAK OF THOUGH. CUMULUS TOWERS BASICALLY DRIVEN BY LOCALIZED BEST SFC CONVERGENCE ALONG WIND SHIFT LINE OR SUBTLE TERRAIN FEATURES. PRETTY MUCH THE SAME STORY FOR MONDAY AND TUESDAY AS TEMPERATURES WILL CONTINUE TO BE WARM WITH A SLIGHT CHANCE FOR AFTERNOON THUNDERSTORMS. SFC WIND CONVERGENCE NOT AS SHARP AS THE NOTICEABLE BOUNDARY TODAY...BUT MINIMAL CHANCES EXIST NONETHELESS. MOST AREAS WILL REMAIN DRY. .LONG TERM...WEDNESDAY THROUGH SUNDAY FORECAST FOCUS IN THE EXTENDED PERIOD CENTERS ON TIMING AND COVERAGE OF PCPN. FORECAST CONFIDENCE: LOW TO MODERATE DETERMINISTIC AND ENSEMBLE MODEL GUIDANCE AGREE RELATIVELY WELL WITH THE LARGE SCALE SYNOPTIC PATTERN. HOWEVER SIGNIFICANT DIFFERENCES REGARDING THE TIMING/AMPLITUDE OF INDIVIDUAL SHORTWAVES AND EXTENT OF LOW LEVEL MOISTURE RETURN LEAD TO LOWER FORECAST CONFIDENCE. UPPER PATTERN WILL DOMINATED BY AN EXPANSIVE RIDGE OVER THE INTERMOUNTAIN WEST...WITH BROAD TROUGHING OVER THE ERN CONUS. A SERIES OF SHORTWAVES FROM THE PAC NW ARE EXPECTED TO CREST THE MEAN RIDGE...THEN DROP SEWD THRU THE NRN PLAINS. THE 08/12Z GFS REMAINS AGGRESSIVE/BULLISH WITH INDIVIDUAL SHORTWAVES AND RESULTANT QPF...ALTHOUGH THIS MAY BE RELATED TO THE PERSISTENT OVER-FORECAST OF LOW LEVEL MOISTURE...AND POSSIBLY GRID SCALE/CONVECTIVE FEEDBACK. CONVERSELY...THE 08/12Z GEM AND ECMWF ARE WEAKER/SLOWER WITH THE UPPER LEVEL IMPULSES AND DEVELOP A WEAKER RESPONSE FROM THE NOCTURNAL LLJ. THE GFS ENSEMBLE POPS ALSO SEEM TO BE MORE IN LINE WITH THE CONSERVATIVE/DRIER SOLUTION. AT THIS TIME...FELT THE CONSENSUS APPROACH WAS THE WAY TO GO AND THUS MAINTAINED GENERALLY LOW CHANCES FOR PCPN /20-30 PCT/ THROUGH MUCH OF THE PERIOD. FOR THOSE WANTING AND NEEDING A GOOD DOUSE OF RAINFALL...NOT GREAT NEWS. HOWEVER...WOULD NOT BE SURPRISED IF A FEW PERIODS IN THE EXTENDED REQUIRE HIGHER POPS IN LATER FORECASTS ...JUST VERY DIFFICULT TO PIN DOWN WHICH PERIODS AT THIS POINT. AS FOR TEMPERATURES...GENERALLY SIDED TOWARDS THE WARMER SIDE OF GUIDANCE DUE TO THE DRY AMBIENT CONDITIONS...AND BETTER POTENTIAL FOR DEEPER VERTICAL MIXING. WILL HAVE TO WATCH CLOUD COVER TRENDS OF COURSE...WHICH WOULD LIMIT DIABATIC HEATING AND THUS SUPPRESS WARMING. OVERALL...HIGHS IN THE UPPER 80S TO MID 90S LOOK LIKE A GOOD BET. && .AVIATION... 00Z TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS VFR CONDITIONS ARE EXPECTED AT ALL TAF LOCATIONS THROUGH TONIGHT AND MONDAY. ALTHOUGH A TEMPORARY PERIOD OF 3 TO 5 MILE FOG IS EXPECTED AT ABR LATER TONIGHT. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. && UPDATE...MOHR SHORT TERM...TMT LONG TERM...FOWLE AVIATION...MOHR WEATHER.GOV/ABERDEEN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ABERDEEN SD 337 AM CDT SUN JUL 8 2012 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-090845- 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- 337 AM CDT SUN JUL 8 2012 /237 AM MDT SUN JUL 8 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 THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS LATE THIS AFTERNOON AND EVENING...BUT SEVERE WEATHER IS NOT EXPECTED. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE AREA COUPLE PERIODS WHERE THERE IS A SLIGHT CHANCE OF THUNDERSTORMS...BUT FOR NOW NO SEVERE WEATHER IS ANTICIPATED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. TDK
The Aberdeen radar (KABR), 139 km away, was scanning. The volume nearest the first event began at 00:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Seventy mph winds caused crop and tree damage from Rosholt to four miles north of Rosholt.
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, July 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: 403519.