Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 261, NWS Des Moines, IA

July 30, 20248 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 30, 2024, 8:53 AM CDT for 8 counties in Iowa. It was in force for 67 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 30, 2024, 8:53 AM CDT (13:53 UTC)
Expired: Jul 30, 2024, 10:00 AM CDT
In force: 67 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Boone County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Madison County, IA, Polk County, IA, Story County, IA, Warren County, IA

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 1.9 hours before the alert went out and 286 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: 1092 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 821 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Jul 30, 6:27 AM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Jul 30, 6:27 AM CDT, 2 hours 26 minutes before

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Hazardous weather outlook, Jul 30, 5:24 AM CDT, 3 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
524 AM CDT Tue Jul 30 2024

IAZ004>007-015>017-025>028-037>039-048>050-061-062-311030-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Wright-Franklin-Butler-Bremer-Hardin-Grundy-Black Hawk-Story-
Marshall-Tama-Jasper-Poweshiek-
524 AM CDT Tue Jul 30 2024

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Thunderstorms chances continue today, including the potential for
strong to severe storms capable of large hail, damaging winds, and
a few tornadoes.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Strong to severe storms are possible again Wednesday into
Wednesday night, including the potential for large hail and
damaging winds. Conditions will be hot and humid Wednesday with
peak heat index values pushing to near or above 100 to 105
degrees.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed today and Wednesday.

IAZ023-024-033>036-044>047-057>060-070>075-081>086-092>097-311030-
Pocahontas-Humboldt-Sac-Calhoun-Webster-Hamilton-Crawford-Carroll-
Greene-Boone-Audubon-Guthrie-Dallas-Polk-Cass-Adair-Madison-
Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-
Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis-
524 AM CDT Tue Jul 30 2024

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A Heat Advisory is in effect for the area today. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

Thunderstorms chances continue today, including the potential for
strong to severe storms capable of large hail, damaging winds, and
a few tornadoes.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Strong to severe storms are possible again Wednesday into
Wednesday night, including the potential for large hail and
damaging winds. Conditions will be hot and humid Wednesday with
peak heat index values pushing to near or above 105 to 110
degrees.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed today and Wednesday.

In the hours before

Local storm report, Jul 30, 4:07 AM CDT, 4 hours 46 minutes before

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Local storm report, Jul 30, 4:31 AM CDT, 4 hours 22 minutes before

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Local storm report, Jul 30, 4:33 AM CDT, 4 hours 20 minutes before

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Local storm report, Jul 30, 4:47 AM CDT, 4 hours 6 minutes before

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Local storm report, Jul 30, 4:55 AM CDT, 3 hours 58 minutes before

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Special weather statement, Jul 30, 7:59 AM CDT, 54 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
Jul 30, 12:24 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	51 min
Jul 30, 1:03 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Humboldt, Pocahontas, Sac and 1 more	42 min
Jul 30, 1:29 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Carroll, Cass, Dallas, Greene and 1 more	46 min
Jul 30, 1:43 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Boone, Calhoun, Carroll, Dallas, Greene and 5 more	47 min
Jul 30, 2:23 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Jasper, Marion, Marshall and 4 more	52 min
Jul 30, 3:05 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Jasper, Lucas, Mahaska, Marion, Monroe and 2 more	40 min
Jul 30, 3:40 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Lucas, Mahaska, Marion, Monroe and 3 more	65 min
Jul 30, 4:34 AM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Davis, Wapello	26 min
Jul 30, 4:41 AM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	19 min
Jul 30, 7:59 AM CDT	Special Weather Statement	DMX	Calhoun, Carroll, Crawford, Greene	31 min
Jul 30, 8:25 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Boone, Carroll, Dallas, Greene, Guthrie	50 min
Jul 30, 9:08 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Dallas, Guthrie, Madison and 1 more	67 min
Jul 30, 9:44 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Jasper, Lucas, Madison, Mahaska, Marion and 3 more	61 min
Jul 30, 10:00 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Clarke, Decatur, Lucas, Madison, Ringgold and 2 more	60 min
Jul 30, 10:12 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Lucas, Mahaska, Marion, Monroe and 3 more	78 min
Jul 30, 10:54 AM CDT	Special Weather Statement	DMX	Boone	51 min
Jul 30, 1:04 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Polk	30 min
Jul 30, 1:09 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Polk, Warren	51 min
Jul 30, 1:15 PM CDT	Special Weather Statement	DMX	Polk	30 min
Jul 30, 1:51 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Polk	39 min
Jul 30, 2:11 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	64 min
Jul 30, 2:13 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	47 min
Jul 30, 2:42 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	32 min
Jul 30, 3:08 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe, Wapello	52 min
Jul 30, 3:18 PM CDT	Heat Advisory	DMX	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 25 more	28 hr
Jul 30, 3:27 PM CDT	Flood Watch	DMX	Boone, Calhoun, Carroll, Dallas, Davis, Greene and 14 more	16 hr
Jul 30, 3:29 PM CDT	Flash Flood Warning	DMX	Jasper, Mahaska, Marion	3 hr
Jul 30, 3:34 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Appanoose, Davis, Monroe, Wapello	59 min
Jul 30, 3:57 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	48 min
Jul 30, 4:43 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska	34 min
Jul 30, 5:50 PM CDT	Special Weather Statement	DMX	Wapello	25 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2024 Every severe thunderstorm warning in 2024

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.