Alert archive / Iowa / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 116, NWS Des Moines, IA

June 20, 20254 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 2025, 4:01 AM CDT for 4 counties in Iowa. It was in force for 44 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: Jun 20, 2025, 4:01 AM CDT (09:01 UTC)
Expired: Jun 20, 2025, 4:45 AM CDT
In force: 44 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cerro Gordo County, IA, Franklin County, IA, Hancock County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 132 km from the middle of the area, began a volume at 09:03 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 00:00Z, 9.0 hours before the alert went out and 216 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: 1319 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1988 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 337 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.0

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 Jun 20, 3:44 AM CDT, 17 minutes earlier.

Area forecast discussion, Jun 20, 3:44 AM CDT, 17 minutes before

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Hazardous weather outlook, Jun 19, 2:39 PM CDT, 13 hours 22 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
239 PM CDT Thu Jun 19 2025

IAZ006-007-016-017-025>028-036>039-047>050-059>062-072>075-
082>086-093>097-201945-
Winnebago-Worth-Hancock-Cerro Gordo-Wright-Franklin-Butler-Bremer-
Hamilton-Hardin-Grundy-Black Hawk-Boone-Story-Marshall-Tama-
Dallas-Polk-Jasper-Poweshiek-Madison-Warren-Marion-Mahaska-Union-
Clarke-Lucas-Monroe-Wapello-Ringgold-Decatur-Wayne-Appanoose-
Davis-
239 PM CDT Thu Jun 19 2025

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Tonight

Thunderstorms will move across northern to central Iowa very late
tonight and into Friday morning. A few stronger storms may produce
hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Storms will continue Friday morning with damaging winds and hail
possible in especially the northeast and depart before noon.
Additional storms are expected late Sunday evening and into early
next week. Severe chances will be better determined in the coming
days.

Hot and humid conditions are expected from Friday through the
weekend, with heat indices exceeding 100 degrees. A Heat Advisory
is in effect for parts of the area Friday. An Extreme Heat Watch
is in effect Saturday through Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

IAZ004-005-015-023-024-033>035-044>046-057-058-070-071-081-092-
201945-
Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Sac-Calhoun-Webster-
Crawford-Carroll-Greene-Audubon-Guthrie-Cass-Adair-Adams-Taylor-
239 PM CDT Thu Jun 19 2025

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Tonight

Thunderstorms will move across northern to central Iowa very late
tonight and into Friday morning. A few stronger storms may produce
hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Storms will taper off Friday morning. Additional storms are
expected late Sunday evening and into early next week. Severe
chances will be better determined in the coming days.

Hot and humid conditions are expected from Friday through the
weekend, with heat indices exceeding 100 degrees. An Extreme Heat
Warning is in effect for Friday. An Extreme Heat Watch is in
effect Saturday through Sunday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

In the hours before

Local storm report, Jun 20, 2:38 AM CDT, 1 hour 23 minutes before

Preliminary Local Storm Report
National Weather Service Des Moines IA
238 AM CDT Fri Jun 20 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0226 AM     Tstm Wnd Gst     2 WNW Gruver            43.41N 94.75W
06/20/2025  M59 MPH          Emmet              IA   ASOS

            measured at the Estherville airport.

&&

RD

Local storm report, Jun 20, 3:24 AM CDT, 37 minutes 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
Jun 20, 1:59 AM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth	46 min
Jun 20, 2:26 AM CDT	Severe Thunderstorm Warning	DMX	Taylor	49 min
Jun 20, 2:42 AM CDT	Severe Thunderstorm Warning	DMX	Emmet, Hancock, Kossuth, Palo Alto, Winnebago	48 min
Jun 20, 3:16 AM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Humboldt, Kossuth, Winnebago, Wright	44 min
Jun 20, 3:21 AM CDT	Heat Advisory	DMX	Appanoose, Black Hawk, Bremer, Butler, Cerro Gordo, Davis and 9 more	4 days
Jun 20, 3:49 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Franklin, Hamilton, Humboldt, Webster, Wright	41 min
Jun 20, 4:29 AM CDT	Severe Thunderstorm Warning	DMX	Franklin, Grundy, Hamilton, Hardin, Webster, Wright	61 min
Jun 20, 4:43 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin, Grundy	47 min
Jun 20, 5:19 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Hamilton, Hardin, Marshall, Story and 1 more	56 min
Jun 20, 5:59 AM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	31 min
Jun 20, 6:03 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Story, Tama	57 min
Jun 20, 6:09 AM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	51 min
Jun 20, 6:28 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Cerro Gordo, Worth	47 min
Jun 20, 8:19 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Marshall, Tama	41 min
Jun 20, 8:42 AM CDT	Flash Flood Warning	DMX	Black Hawk, Butler, Grundy	3 hr
Jun 20, 8:58 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Tama	62 min
Jun 20, 10:26 AM CDT	Special Weather Statement	DMX	Jasper, Poweshiek	49 min
Jun 20, 11:02 AM CDT	Special Weather Statement	DMX	Mahaska, Marion, Monroe, Wapello	43 min
Jun 20, 11:45 AM CDT	Special Weather Statement	DMX	Appanoose, Davis, Monroe, Wapello	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.