With abnormal heat and humidity across the area for early September, isolated thunderstorms developed during the early morning hours. One of these storms generated a heat burst near the town of Redfield.
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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.
With abnormal heat and humidity across the area for early September, isolated thunderstorms developed during the early morning hours. One of these storms generated a heat burst near the town of Redfield. The Automated Weather Observing System (AWOS) at the Redfield airport recorded a wind gust of 57 mph, with the associated winds causing some roofing material to get blown off a trailer 4 miles south of Redfield. This heat burst also resulted in a temperature jump from 73 degrees to 84 degrees in just 20 minutes at the AWOS.
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 Sep 3, 11:41 PM CST, 2 hours 39 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 1241 AM CDT Mon Sep 4 2023 .UPDATE... Issued at 1239 AM CDT Mon Sep 4 2023 Aviation discussion updated below for the 06Z TAFs. UPDATE Issued at 701 PM CDT Sun Sep 3 2023 Heat indices have begun to fall, therefore have allowed the Heat Advisory to expire. Will continue to monitor for the potential for some rain showers later tonight. No other changes made to the forecast at this time. && .SHORT TERM...(This Evening through Monday Night) Issued at 235 PM CDT Sun Sep 3 2023 The persistent mid level ridge over the Northern Plains will start to breakdown this period. An upper trof currently near the west coast of California will get ejected into the Northern Plains over the next couple days. Ahead of the system, we'll likely remain capped through Monday, with H7 temps of +12C or greater through most of that time period. However, for Monday night/Tues that thermal ridge will subside as the heart of the upper trof pushes across the forecast area. A sfc front also advects east over the region on Monday/Monday night, but it might be too capped to kick off any convection ahead of the boundary, with most pcpn popping up post- frontal. Rain may not even make it into the eastern CWA until Tuesday. At that time, there may be a better chance for some severe storms as deep layer shear combines with moderate MLCAPE values over eastern South Dakota in the afternoon. All that said, LL shear looks pretty pathetic. So, still some questions regarding strength of storms Tues afternoon. As for temperatures, models indicated H85 temps dropping from +20/+25C on Labor Day, down toward +10/+12C for Tues/Wed, so definitely should see milder temps for mid week. Heat indices are generally forecast under 100 for Monday, so for now no headlines planned. .LONG TERM...(Tuesday through Sunday) Issued at 235 PM CDT Sun Sep 3 2023 The long term portion of the forecast begins on Tuesday with an upper level trough and surface low pressure system impacting the region. As of now, the majority of the pcpn should occur with the upper level trough, with the surface low moving into Minnesota around 18Z Tuesday. There is a brief window where modest instability and convective potential overlaps with strong to severe storms possible over eastern South Dakota and western Minnesota. High temperatures across the CWA will vary greatly, with highs in the mid 60s, in north central SD, to the lower 80s in western Minnesota. Showers and storms should continue across eastern SD and into western MN Tuesday night, with mostly dry condition expected by 12Z Wednesday. Beyond Wednesday, the forecast period features mostly dry conditions with limited pcpn potential. While high temperatures in the 70s and low 80s will be significantly cooler compared to the Labor Day Weekend, these readings are near to slightly above average for this time of year. && .AVIATION...(For the 06Z TAFS through 06Z Monday Night) Issued at 1239 AM CDT Mon Sep 4 2023 Terminals KABR,KATY,KPIR,KMBG A few showers are possible later tonight into early Monday morning, but for the most part, VFR conditions will prevail overnight into much of the Monday afternoon. Scattered showers and thunderstorms will affect mainly central South Dakota Monday evening. Some of the storms could be strong to severe. Hail and strong wind gusts will be the main threats. Periods of IFR/MVFR vsbys in heavy rain are possible with the thunderstorms. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && UPDATE...TMT SHORT TERM...TDK LONG TERM...SD AVIATION...TMT/Parkin
Hazardous Weather Outlook National Weather Service Aberdeen SD 450 AM CDT Sun Sep 3 2023 SDZ022-023-033-035>037-045-048-051-041000- Hamlin-Deuel-Stanley-Hughes-Hyde-Hand-Jones-Lyman-Buffalo- 450 AM CDT Sun Sep 3 2023 /350 AM MDT Sun Sep 3 2023/ This Hazardous Weather Outlook is for central South Dakota and northeast South Dakota. .DAY ONE...Today and tonight. Temperatures in the upper 90s to around 100 degrees this afternoon will combine with high enough humidity values to produce heat index values in the low 100s. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Scattered thunderstorms will be possible Monday night into Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MNZ039-046-SDZ003>011-015>021-034-041000- Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-Roberts- Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-Codington-Grant- Sully- 450 AM CDT Sun Sep 3 2023 /350 AM MDT Sun Sep 3 2023/ 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. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Scattered thunderstorms will be possible Monday night into Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Aberdeen radar (KABR), 71 km away, was scanning. The volume nearest the first event began at 08:20 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds blew building material off a trailer and scattered it across the property.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2023Every state in 2023This day in weather historyWarnings in South Dakota, September 2023
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: 1131764.