Alert archive / Iowa / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 219, NWS Des Moines, IA

August 15, 20255 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 15, 2025, 4:54 PM CDT for 5 counties in Iowa. It was in force for 51 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, 4:54 PM CDT (21:54 UTC)
Expired: Aug 15, 2025, 5:45 PM CDT
In force: 51 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Poweshiek County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 101 km from the middle of the area, began a volume at 21:54 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
Aug 15, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.9 hours before the alert went out and 186 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 369 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

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, 3:00 PM CDT, 1 hour 54 minutes earlier.

Area forecast discussion, Aug 15, 3:00 PM CDT, 1 hour 54 minutes before

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Hazardous weather outlook, Aug 15, 3:08 PM CDT, 1 hour 46 minutes before

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In the hours before

Local storm report, Aug 15, 3:10 PM CDT, 1 hour 44 minutes before

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Local storm report, Aug 15, 3:30 PM CDT, 1 hour 24 minutes before

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Local storm report, Aug 15, 3:32 PM CDT, 1 hour 22 minutes before

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Local storm report, Aug 15, 4:24 PM CDT, 30 minutes before

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Local storm report, Aug 15, 4:34 PM CDT, 20 minutes before

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Local storm report, Aug 15, 4:36 PM CDT, 18 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 12:21 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Calhoun, Pocahontas, Sac	39 min
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

Nearby

Severe Thunderstorm Warnings in Iowa, 2025 Every 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.