Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 134, NWS Des Moines, IA

July 23, 20225 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 23, 2022, 9:15 PM CDT for 5 counties in Iowa. It was in force for 30 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 23, 2022, 9:15 PM CDT (02:15 UTC)
Expired: Jul 23, 2022, 9:45 PM CDT
In force: 30 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Audubon County, IA, Carroll County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 02:17 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
Jul 23, 8:55 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.3 hours before the alert went out and 162 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: 2390 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 2218 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 348 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

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 23, 6:44 PM CDT, 2 hours 31 minutes earlier.

Area forecast discussion, Jul 23, 6:44 PM CDT, 2 hours 31 minutes before

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Hazardous weather outlook, Jul 23, 3:24 PM CDT, 5 hours 51 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 23, 8:49 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac, Webster	41 min
Jul 23, 8:55 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	50 min
Jul 23, 8:59 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	46 min
Jul 23, 9:05 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DMX	Calhoun, Sac, Webster	40 min
Jul 23, 9:39 PM CDT	Special Weather Statement	DMX	Boone, Dallas, Hamilton, Polk, Story, Webster	51 min
Jul 23, 9:48 PM CDT	Special Weather Statement	DMX	Audubon, Calhoun, Carroll, Greene, Guthrie, Humboldt and 3 more	42 min
Jul 23, 9:55 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Pocahontas	50 min
Jul 23, 10:07 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Hamilton, Story, Webster	38 min
Jul 23, 11:09 PM CDT	Special Weather Statement	DMX	Black Hawk, Grundy, Jasper, Marshall, Poweshiek, Tama	51 min
Jul 24, 12:46 AM CDT	Special Weather Statement	DMX	Hardin	29 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2022 Every severe thunderstorm warning in 2022

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.