Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 18, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 23, 2026, 12:12 PM CDT for Woodbury County, Iowa. It was in force for 48 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
- Apr 23, 2026, 12:12 PM CDT (17:12 UTC)
- Expired
- Apr 23, 2026, 1:00 PM CDT
- In force
- 48 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Woodbury County, IA
The radar
The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 17:11 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 23, 12:02 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 5.2 hours before the alert went out and 337 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 830 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 222 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 23, 6:46 AM CDT, 5 hours 26 minutes earlier.
Area forecast discussion, Apr 23, 6:46 AM CDT, 5 hours 26 minutes before
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</html>Hazardous weather outlook, Apr 23, 3:30 AM CDT, 8 hours 42 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 330 AM CDT Thu Apr 23 2026 IAZ001>003-012>014-020>022-031-032-MNZ080-081-089-090-098-NEZ013-014- SDZ071-240830- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Murray-Cottonwood-Nobles-Jackson-Rock-Dixon- Dakota-Union- 330 AM CDT Thu Apr 23 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. Scattered showers and thunderstorms will be possible this afternoon and evening. A few storms could become severe with large hail up to half dollar size and damaging winds up to 60 mph being the primary threats. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. MNZ071-072-097-SDZ038>040-050-052>070-240830- Lincoln-Lyon-Pipestone-Beadle-Kingsbury-Brookings-Gregory-Jerauld- Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook- Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton- Clay- 330 AM CDT Thu Apr 23 2026 This Hazardous Weather Outlook is for southwest Minnesota, central South Dakota, east central South Dakota, south central South Dakota and southeast South Dakota. .DAY ONE...Today and tonight. A few scattered showers with an occasional rumble of thunder will be possible through the morning. Elevated to critical fire danger is expected today as westerly to northwesterly winds strengthen behind a cold front. This combined with low relative humidity values will create a favorable environment for fire spread. Avoid any outdoor burning and heed your local restrictions. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 2:13 AM CDT | Red Flag Warning | FSD | Aurora, Beadle, Bon Homme, Brookings, Brule, Charles Mix and 16 more | 18 hr |
| Apr 23, 12:48 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 42 min |
| Apr 23, 3:12 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee | 48 min |
| Apr 23, 3:27 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 48 min |
| Apr 23, 3:37 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 38 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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.