Alert archive / Iowa / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 166, NWS Quad Cities, IA

October 12, 2022Johnson County, Linn County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Oct 12, 2022, 3:18 AM CDT for Johnson County, Linn County, Iowa. It was in force for 27 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: Oct 12, 2022, 3:18 AM CDT (08:18 UTC)
Expired: Oct 12, 2022, 3:45 AM CDT
In force: 27 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Johnson County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 89 km from the middle of the area, began a volume at 08:21 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

Minneapolis, MN (KMPX), launched 00:00Z, 8.3 hours before the alert went out and 368 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: 1051 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1527 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 304 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Oct 12, 2:56 AM CDT, 22 minutes earlier.

Area forecast discussion, Oct 12, 2:56 AM CDT, 22 minutes before

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Hazardous weather outlook, Oct 11, 3:38 AM CDT, 23 hours 40 minutes before

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In the hours before

Special weather statement, Oct 12, 2:56 AM CDT, 22 minutes before

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Special weather statement, Oct 12, 3:15 AM CDT, 3 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
Oct 12, 2:56 AM CDT	Special Weather Statement	DVN	Iowa, Johnson, Keokuk, Washington	64 min
Oct 12, 3:15 AM CDT	Special Weather Statement	DVN	Cedar, Jackson, Jones	60 min
Oct 12, 3:32 AM CDT	Special Weather Statement	DVN	Dubuque	28 min
Oct 12, 12:31 PM CDT	Wind Advisory	DVN	Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and 1 more	6 hr

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.