Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 59, NWS Des Moines, IA

April 23, 2022Black Hawk County, Bremer County, Grundy County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 23, 2022, 8:38 PM CDT for Black Hawk County, Bremer County, Grundy County, Iowa. It was in force for 26 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: Apr 23, 2022, 8:38 PM CDT (01:38 UTC)
Expired: Apr 23, 2022, 9:04 PM CDT
In force: 26 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Black Hawk County, IA, Bremer County, IA, Grundy County, IA

The radar

The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 01:37 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
Apr 23, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.6 hours before the alert went out and 271 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: 381 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1277 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: 278 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.6

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 Apr 23, 7:54 PM CDT, 44 minutes earlier.

Area forecast discussion, Apr 23, 7:54 PM CDT, 44 minutes before

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Hazardous weather outlook, Apr 23, 8:17 PM CDT, 21 minutes before

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In the hours before

Local storm report, Apr 23, 7:53 PM CDT, 45 minutes before

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Local storm report, Apr 23, 8:02 PM CDT, 36 minutes before

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Local storm report, Apr 23, 8:03 PM CDT, 35 minutes before

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Local storm report, Apr 23, 8:10 PM CDT, 28 minutes before

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Local storm report, Apr 23, 8:26 PM CDT, 12 minutes before

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Local storm report, Apr 23, 8:32 PM CDT, 6 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        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
Apr 23, 7:00 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	45 min
Apr 23, 7:11 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	34 min
Apr 23, 7:14 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Dallas, Madison, Polk, Warren	46 min
Apr 23, 7:19 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Grundy, Hardin	41 min
Apr 23, 7:39 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Lucas, Warren, Wayne	36 min
Apr 23, 7:46 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion, Marshall, Polk, Story, Warren	44 min
Apr 23, 8:17 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Tama	43 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.