Severe thunderstorms brought wind gusts up to sixty-five mph to parts of north central South Dakota.
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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.
Severe thunderstorms brought wind gusts up to sixty-five mph to parts of north central South Dakota.
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 Aug 8, 1:58 AM MST, 1 hour 32 minutes earlier.
Area Forecast Discussion National Weather Service Aberdeen SD 358 AM CDT Sat Aug 8 2020 .SHORT TERM...(Today through Sunday Afternoon) Issued at 358 AM CDT Sat Aug 8 2020 Once again convection will be the main concern in the short term. Some light WAA continues this morning for the region and will keep us above normal today with highs in the upper 80s throughout the region. Higher dewpoints continue this afternoon in the upper 60s and low 70s, making for another humid day. As mentioned before, convection may be an issue today. Models show shortwave moving northeast out of Nebraska later tonight into Sunday morning. Prior to that some CAM solutions hint at isolated storm development this afternoon due to heating with good instability already in place, but it may have some trouble overcoming capping. Have kept some low pops in place this afternoon, but the better chance for convective initiation looks to be tonight with the shortwave passage. Compared to last night, there is a bit more agreement on late night early morning development with the potential for some localized heavy rainfall. Models show ML CAPE values in the 2500-3500J/KG range, though shear remains moderate in the 25-35kt range. The better chance for severe will be along the boundary tonight as well as potential cold pool winds reaching into the 60- 70mph range. Sunday morning some storms may linger in the region, but should be more dry than not. Temps continue to be above normal with the low level southerly wind component. We do see a shift later during the day out of north that may cool us down for a short while after that. .LONG TERM...(Sunday Evening through Friday) Issued at 358 AM CDT Sat Aug 8 2020 Not much has changed with the models and ensembles with respect to the weather pattern from Sunday night on through Friday. The upper level flow will be the coolest for the region on Monday as the flow will be from the northwest. Highs on Monday will be mostly in the upper 70s to the lower 80s. For the rest of the long term, the upper level flow becomes westerly with the flow becoming more southwesterly towards the end of the week. Again, hard to time short waves, periods of waa, occasional good deep layer shear, along with good moisture and instability will result in periods of showers/storms through the week. After a cooler Monday, Tuesday through Friday will be mostly in the 80s to the lower 90s. && .AVIATION...(For the 06Z TAFS through 06Z Saturday Night) Issued at 1226 AM CDT Sat Aug 8 2020 Terminals KABR,KATY,KPIR,KMBG Chances for any storms during the TAF period is low, however some showers/storms may be possible later Saturday night. Not enough confidence to put them at the end of the TAF with most models showing timing later. Aside from some expected low cloud and fog development over KATY this morning, VFR condtions are expected. ***Construction to improve taxiways at both KABR/KPIR terminals may cause an occasional temporary visibility reduction due to blowing dust (bldu), mainly during daytime hours UFN. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && SHORT TERM...Dye LONG TERM...Mohr AVIATION...Dye
Hazardous Weather Outlook National Weather Service Aberdeen SD 423 AM CDT Sat Aug 8 2020 MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-090930- 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- 423 AM CDT Sat Aug 8 2020 /323 AM MDT Sat Aug 8 2020/ This Hazardous Weather Outlook is for west central Minnesota, central South Dakota, north central South Dakota and northeast South Dakota. .DAY ONE...Today and tonight. A boundary is expected to push through the region late this afternoon or evening, which may bring storms, especially in the south and eastern parts of the forecast area. There is potential for isolated severe storms with hail and damaging wind being the main threat. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Sunday the potential for storms lingers, mostly in far eastern SD along the I-29 corridor. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Bismarck radar (KBIS), 134 km away, was scanning. The volume nearest the first event began at 10:28 UTC.
2 thunderstorm wind. Local standard time, as filed.
Estimated sixty mph winds downed some large tree branches onto power lines causing power outages.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2020Every state in 2020This day in weather historyWarnings in South Dakota, August 2020
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: 915093, 915094.