Alert archive / Iowa / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 211, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 15, 2025, 12:21 PM CDT for Calhoun County, Pocahontas County, Sac County, Iowa. It was in force for 39 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 15, 2025, 12:21 PM CDT (17:21 UTC)
- Expired
- Aug 15, 2025, 1:00 PM CDT
- In force
- 39 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Calhoun County, IA, Pocahontas County, IA, Sac County, IA
The radar
The Des Moines radar (KDMX), 124 km from the middle of the area, began a volume at 17:23 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, 5.4 hours before the alert went out and 279 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
- 1154 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 833 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 349 m²/s²
- 0-3 km storm-relative helicity
- 265 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.4
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 15, 6:13 AM CDT, 6 hours 8 minutes earlier.
Area forecast discussion, Aug 15, 6:13 AM CDT, 6 hours 8 minutes before
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</html>Hazardous weather outlook, Aug 15, 6:21 AM CDT, 6 hours before
Hazardous Weather Outlook National Weather Service Des Moines IA 621 AM CDT Fri Aug 15 2025 IAZ004>007-015>017-023>028-033>039-044>050-057>062-072>075-086- 161130- 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-Madison-Warren-Marion-Mahaska-Wapello- 621 AM CDT Fri Aug 15 2025 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight Scattered showers and storms possible throughout the day Friday, especially in the afternoon and evening. There is a Marginal Risk for severe weather across northern Iowa. Damaging winds will be the primary threat. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Intermittent storm chances continue through the weekend, mainly over northern Iowa along the Iowa/Minnesota border. The weekend will be hot with heat indices over 100 degrees possible. .SPOTTER INFORMATION STATEMENT... Spotters may be needed in northern Iowa Today. IAZ070-071-081>085-092>097-161130- Cass-Adair-Adams-Union-Clarke-Lucas-Monroe-Taylor-Ringgold- Decatur-Wayne-Appanoose-Davis- 621 AM CDT Fri Aug 15 2025 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight A Heat Advisory is in effect for the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Scattered showers and non-severe storms southwest in the morning. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The weekend will be hot with heat indices over 100 degrees possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated.
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:50 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Hamilton, Hancock, Humboldt, Kossuth, Palo Alto and 5 more | 40 min |
| Aug 15, 2:00 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hancock, Wright | 45 min |
| Aug 15, 2:27 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 33 min |
| Aug 15, 2:32 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 28 min |
| Aug 15, 2:51 PM CDT | Heat Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 29 hr |
| Aug 15, 2:59 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler | 61 min |
| Aug 15, 3:36 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Franklin, Grundy, Hamilton, Hardin, Marshall and 2 more | 39 min |
| Aug 15, 4:15 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Tama | 45 min |
| Aug 15, 4:54 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Marshall, Poweshiek, Tama | 51 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2025Every severe thunderstorm warning in 2025
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.