Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 75, NWS Quad Cities, IA

July 4, 2022Delaware County, Dubuque County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 4, 2022, 8:45 PM CDT for Delaware County, Dubuque County, Iowa. It was in force for 45 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 4, 2022, 8:45 PM CDT (01:45 UTC)
Expired: Jul 4, 2022, 9:30 PM CDT
In force: 45 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Delaware County, IA, Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 01:46 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 4, 8:07 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.8 hours before the alert went out and 108 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: 3635 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 538 m²/s²
Significant tornado parameter: 6.2
Supercell composite: 38.0

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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 6:24 PM CDT, 2 hours 21 minutes earlier.

Area forecast discussion, Jul 4, 6:24 PM CDT, 2 hours 21 minutes before

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Hazardous weather outlook, Jul 4, 3:44 PM CDT, 5 hours 1 minute before

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In the hours before

Local storm report, Jul 4, 3:48 PM CDT, 4 hours 57 minutes before

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Local storm report, Jul 4, 4:08 PM CDT, 4 hours 37 minutes before

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Local storm report, Jul 4, 4:12 PM CDT, 4 hours 33 minutes before

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Local storm report, Jul 4, 4:27 PM CDT, 4 hours 18 minutes before

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Local storm report, Jul 4, 6:48 PM CDT, 1 hour 57 minutes before

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Local storm report, Jul 4, 7:34 PM CDT, 1 hour 11 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 4, 9:50 PM CDT	Special Weather Statement	DVN	Delaware	25 min
Jul 5, 1:09 PM CDT	Excessive Heat Warning	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more	7 hr
Jul 4, 10:08 PM CDT	Special Weather Statement	DVN	Stephenson	37 min
Jul 4, 10:22 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	23 min
Jul 4, 10:42 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	48 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.