Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 215, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 7, 2026, 7:27 AM CDT for Dickinson County, Osceola County, Iowa; Jackson County, Nobles County, Minnesota. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2026, 7:27 AM CDT (12:27 UTC)
- Expired
- Aug 7, 2026, 7:49 AM CDT
- In force
- 22 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Dickinson County, IA, Osceola County, IA, Jackson County, MN, Nobles County, MN
The radar
The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 12:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 0.5 hours before the alert went out and 207 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 506 J/kg
- Mixed-layer CIN
- -343 J/kg
- Mixed-layer LCL
- 1332 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 250 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 6:50 AM CDT, 37 minutes earlier.
Area forecast discussion, Aug 7, 6:50 AM CDT, 37 minutes before
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</html>Hazardous weather outlook, Aug 7, 4:10 AM CDT, 3 hours 17 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 410 AM CDT Fri Aug 7 2026 NEZ013-SDZ038>040-050-052>070-080915- Dixon-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-Miner-Lake- Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-Charles Mix- Douglas-Hutchinson-Turner-Lincoln-Bon Homme-Yankton-Clay- 410 AM CDT Fri Aug 7 2026 This Hazardous Weather Outlook is for northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. Patchy fog will continue through mid-morning. A few strong to severe storms will be possible over south-central South Dakota tonight. Large hail will be the main threat. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. An active pattern aloft will lead to periodic chances for showers and thunderstorms into the weekend. Some storms could potentially become strong. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ014-SDZ071-080915- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dakota-Union- 410 AM CDT Fri Aug 7 2026 This Hazardous Weather Outlook is for northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska and southeast South Dakota. .DAY ONE...Today and tonight. Areas of fog will continue along and south of I-90 through mid- morning. Locally dense patches could lead to visibilities of a mile or less especially across portions of northwestern Iowa. Shower and thunderstorm chances will increase this morning with a focus across southwestern Minnesota. IF a few stronger storms can develop, golf ball sized hail and up to 60 mph wind gusts will be the primary threats. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. An active pattern aloft will lead to periodic chances for showers and thunderstorms into the weekend. Some storms could potentially become strong. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Local storm report, Aug 7, 5:53 AM CDT, 1 hour 34 minutes before
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</html>Local storm report, Aug 7, 6:03 AM CDT, 1 hour 24 minutes before
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</html>Local storm report, Aug 7, 6:09 AM CDT, 1 hour 18 minutes before
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</html>The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 2:22 AM CDT | Severe Thunderstorm Warning | FSD | Gregory | 28 min |
| Aug 7, 4:39 AM CDT | Severe Thunderstorm Warning | FSD | Miner, Sanborn | 37 min |
| Aug 7, 4:47 AM CDT | Severe Thunderstorm Warning | FSD | Davison, Hanson | 29 min |
| Aug 7, 5:01 AM CDT | Severe Thunderstorm Warning | FSD | Kingsbury, Lake, Miner | 44 min |
| Aug 7, 5:08 AM CDT | Severe Thunderstorm Warning | FSD | Hanson, Lake, McCook, Miner | 52 min |
| Aug 7, 5:35 AM CDT | Severe Thunderstorm Warning | FSD | Lake, Moody | 21 min |
| Aug 7, 5:43 AM CDT | Severe Thunderstorm Warning | FSD | Brookings | 25 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2026Severe Thunderstorm Warnings in Minnesota, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.