Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 307, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 7, 2026, 1:25 PM CDT for 4 counties in Iowa. It was in force for 50 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, 1:25 PM CDT (18:25 UTC)
- Expired
- Aug 7, 2026, 2:15 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cerro Gordo County, IA, Hancock County, IA, Winnebago County, IA, Worth County, IA
The radar
The Des Moines radar (KDMX), 168 km from the middle of the area, began a volume at 18:26 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, 6.4 hours before the alert went out and 180 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 Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 12:40 PM CDT, 45 minutes earlier.
Area forecast discussion, Aug 7, 12:40 PM CDT, 45 minutes before
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</html>Hazardous weather outlook, Aug 7, 12:50 PM CDT, 35 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 1250 PM CDT Fri Aug 7 2026 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-081800- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper- Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union- Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne- Appanoose-Davis- 1250 PM CDT Fri Aug 7 2026 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight There is a Slight (Level 2 of 5) Risk for severe weather across much of Iowa today. Large hail is the primary threat but damaging winds and a tornado is possible. There is a Marginal (Level 1 of 4) Risk for excessive rainfall across much of Iowa today. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a Marginal (Level 1 of 5) Risk for severe weather across much of Iowa Saturday and again on Sunday. Damaging winds are the primary threat. There is a Marginal (Level 1 of 4) Risk for excessive rainfall across much of Iowa Saturday and again on Sunday. Shower and thunderstorm chances will continue through the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, but any storm reports are appreciated.
In the hours before
Local storm report, Aug 7, 1:22 PM CDT, 3 minutes before
Preliminary Local Storm Report
National Weather Service Des Moines IA
122 PM CDT Fri Aug 7 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0113 PM Hail Forest City 43.26N 93.64W
08/07/2026 E1.00 Inch Winnebago IA Public
From social media.
&&
TDRThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 2:52 AM CDT | Dense Fog Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 44 more | 6 hr |
| Aug 7, 12:46 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 29 min |
| Aug 7, 1:07 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 23 min |
| Aug 7, 1:12 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Wright | 48 min |
| Aug 7, 1:37 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 53 min |
| Aug 7, 2:52 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler | 38 min |
| Aug 7, 3:49 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 26 min |
| Aug 7, 3:53 PM CDT | Tornado Warning | DMX | Black Hawk, Bremer | 22 min |
| Aug 7, 4:16 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Tama | 59 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.