Alert archive / Iowa / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 147, NWS Des Moines, IA

July 13, 20234 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 13, 2023, 8:41 PM CDT for 4 counties in Iowa. It was in force for 49 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 13, 2023, 8:41 PM CDT (01:41 UTC)
Expired: Jul 13, 2023, 9:30 PM CDT
In force: 49 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Jasper County, IA, Marshall County, IA, Poweshiek County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 80 km from the middle of the area, began a volume at 01:43 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

Davenport, (KDVN), launched 00:00Z, 1.7 hours before the alert went out and 191 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: 716 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1322 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

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 13, 6:42 PM CDT, 1 hour 59 minutes earlier.

Area forecast discussion, Jul 13, 6:42 PM CDT, 1 hour 59 minutes before

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Hazardous weather outlook, Jul 13, 2:13 PM CDT, 6 hours 28 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
213 PM CDT Thu Jul 13 2023

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-141915-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
213 PM CDT Thu Jul 13 2023

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Scattered thunderstorms return this afternoon into tonight. A few
stronger storms are possible, mainly in northern Iowa, with gusty
winds the primary threat, though some hail may be possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Some storms may linger into early Friday morning with additional
thunderstorm chances Friday afternoon and evening. A few stronger
storms could occur, mainly in southern Iowa, with locally heavy
rainfall also possible.

Thunderstorm chances continue into the weekend, most likely from
Sunday into Sunday night. The severe threat remains uncertain at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

In the hours before

Local storm report, Jul 13, 3:41 PM CDT, 5 hours before

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Local storm report, Jul 13, 3:51 PM CDT, 4 hours 50 minutes before

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Local storm report, Jul 13, 4:52 PM CDT, 3 hours 49 minutes before

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Special weather statement, Jul 13, 6:19 PM CDT, 2 hours 22 minutes before

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Local storm report, Jul 13, 6:32 PM CDT, 2 hours 9 minutes before

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Special weather statement, Jul 13, 6:44 PM CDT, 1 hour 57 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 13, 7:28 PM CDT	Special Weather Statement	DMX	Hardin	47 min
Jul 13, 7:54 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Tama	51 min
Jul 13, 10:23 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	25 min
Jul 14, 12:37 AM CDT	Special Weather Statement	DMX	Winnebago	23 min
Jul 14, 1:09 AM CDT	Special Weather Statement	DMX	Worth	36 min
Jul 14, 3:50 PM CDT	Special Weather Statement	DMX	Bremer	25 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2023 Every severe thunderstorm warning in 2023

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.