Alert archive / Iowa / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 180, NWS Quad Cities, IA

July 12, 20236 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 12, 2023, 8:43 AM CDT for 6 counties in Iowa. It was in force for 47 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 12, 2023, 8:43 AM CDT (13:43 UTC)
Expired: Jul 12, 2023, 9:30 AM CDT
In force: 47 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cedar County, IA, Johnson County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 68 km from the middle of the area, began a volume at 13:46 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 12, 5:15 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 1.7 hours before the alert went out and 75 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: 9 J/kg
Mixed-layer CIN: -301 J/kg
Mixed-layer LCL: 936 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 6:02 AM CDT, 2 hours 41 minutes earlier.

Area forecast discussion, Jul 12, 6:02 AM CDT, 2 hours 41 minutes before

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Hazardous weather outlook, Jul 12, 4:33 AM CDT, 4 hours 10 minutes before

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In the hours before

Special weather statement, Jul 12, 3:35 AM CDT, 5 hours 8 minutes before

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Special weather statement, Jul 12, 5:46 AM CDT, 2 hours 57 minutes before

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Special weather statement, Jul 12, 6:39 AM CDT, 2 hours 4 minutes before

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Local storm report, Jul 12, 6:56 AM CDT, 1 hour 47 minutes before

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Special weather statement, Jul 12, 7:43 AM CDT, 1 hour before

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Local storm report, Jul 12, 8:37 AM CDT, 6 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 12, 12:25 AM CDT	Special Weather Statement	DVN	Cedar	35 min
Jul 12, 1:46 AM CDT	Special Weather Statement	DVN	Muscatine	29 min
Jul 12, 3:35 AM CDT	Special Weather Statement	DVN	Delaware, Dubuque, Jackson	40 min
Jul 12, 5:46 AM CDT	Special Weather Statement	DVN	Scott	44 min
Jul 12, 7:43 AM CDT	Special Weather Statement	DVN	Benton, Iowa	47 min
Jul 12, 8:05 AM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	55 min
Jul 12, 9:33 AM CDT	Special Weather Statement	DVN	Muscatine	42 min
Jul 12, 9:41 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	49 min
Jul 12, 9:58 AM CDT	Special Weather Statement	DVN	Muscatine, Scott	47 min
Jul 12, 10:05 AM CDT	Special Weather Statement	DVN	Des Moines, Lee, Louisa	40 min
Jul 12, 2:28 AM CDT	Special Weather Statement	DVN	Rock Island	47 min
Jul 12, 2:54 AM CDT	Special Weather Statement	DVN	Bureau, Henry	51 min
Jul 12, 2:57 AM CDT	Special Weather Statement	DVN	Bureau, Henry	48 min
Jul 12, 6:39 AM CDT	Special Weather Statement	DVN	Bureau, Henry, Putnam	96 min
Jul 12, 10:14 AM CDT	Special Weather Statement	DVN	Hancock, Henderson, McDonough, Warren	46 min
Jul 12, 10:23 AM CDT	Special Weather Statement	DVN	Henry, Mercer, Rock Island, Warren	52 min
Jul 12, 10:52 AM CDT	Special Weather Statement	DVN	Henry	38 min
Jul 12, 11:13 AM CDT	Special Weather Statement	DVN	Bureau, Putnam	47 min
Jul 12, 11:55 AM CDT	Special Weather Statement	DVN	Putnam	20 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.