Alert archive / Iowa / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 188, NWS Des Moines, IA

July 29, 20254 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 29, 2025, 9:44 AM CDT for 4 counties in Iowa. It was in force for 34 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: Jul 29, 2025, 9:44 AM CDT (14:44 UTC)
Expired: Jul 29, 2025, 10:18 AM CDT
In force: 34 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA

The radar

The Des Moines radar (KDMX), 148 km from the middle of the area, began a volume at 14:43 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, 2.7 hours before the alert went out and 222 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: 71 J/kg
Mixed-layer CIN: -458 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Jul 29, 6:54 AM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Jul 29, 6:54 AM CDT, 2 hours 50 minutes before

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Hazardous weather outlook, Jul 29, 5:05 AM CDT, 4 hours 39 minutes before

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In the hours before

Special weather statement, Jul 29, 8:43 AM CDT, 1 hour 1 minute before

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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
Jul 28, 10:29 PM CDT	Severe Thunderstorm Warning Destructive damage threat	DMX	Emmet, Kossuth, Palo Alto	76 min
Jul 28, 10:35 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Calhoun, Humboldt, Pocahontas, Sac, Webster	70 min
Jul 28, 10:50 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Greene, Sac, Webster	55 min
Jul 28, 11:17 PM CDT	Severe Thunderstorm Warning Destructive damage threat	DMX	Cerro Gordo, Emmet, Hancock, Kossuth, Palo Alto, Winnebago and 1 more	73 min
Jul 28, 11:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Franklin, Hamilton, Hardin, Humboldt, Webster, Wright	63 min
Jul 28, 11:32 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Calhoun, Carroll, Greene, Hamilton, Hardin and 2 more	58 min
Jul 28, 11:51 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	39 min
Jul 29, 12:11 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Hancock, Winnebago, Worth and 1 more	79 min
Jul 29, 12:27 AM CDT	Special Weather Statement	DMX	Hamilton, Hardin, Story	33 min
Jul 29, 12:47 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy, Hardin	58 min
Jul 29, 12:53 AM CDT	Special Weather Statement	DMX	Grundy, Hardin, Marshall	52 min
Jul 29, 1:23 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Black Hawk, Grundy, Tama	37 min
Jul 29, 1:32 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Jasper, Marshall, Poweshiek, Tama	28 min
Jul 29, 1:54 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marshall, Poweshiek, Tama	66 min
Jul 29, 2:54 AM CDT	Special Weather Statement	DMX	Mahaska	36 min
Jul 29, 8:43 AM CDT	Special Weather Statement	DMX	Palo Alto	32 min
Jul 29, 11:39 AM CDT	River Flood Watch	DMX	Black Hawk	9 hr
Jul 29, 11:39 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	5 days
Jul 29, 1:20 PM CDT	Special Weather Statement	DMX	Humboldt	25 min
Jul 29, 3:08 PM CDT	Flood Watch	DMX	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 36 more	23 hr

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.