Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 224, NWS Quad Cities, IA

August 14, 2023Stephenson County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 14, 2023, 1:47 PM CDT for Stephenson County, Illinois. It was in force for 28 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: Aug 14, 2023, 1:47 PM CDT (18:47 UTC)
Expired: Aug 14, 2023, 2:15 PM CDT
In force: 28 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Stephenson County, IL

The radar

The Quad Cities radar (KDVN), 112 km from the middle of the area, began a volume at 18:47 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.8 hours before the alert went out and 268 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 99 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 Aug 14, 12:21 PM CDT, 1 hour 26 minutes earlier.

Area forecast discussion, Aug 14, 12:21 PM CDT, 1 hour 26 minutes before

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Hazardous weather outlook, Aug 14, 12:36 PM CDT, 1 hour 11 minutes before

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In the hours before

Local storm report, Aug 14, 12:12 PM CDT, 1 hour 35 minutes before

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Special weather statement, Aug 14, 1:00 PM CDT, 47 minutes before

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Special weather statement, Aug 14, 1:42 PM CDT, 5 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
Aug 14, 1:50 PM CDT	Special Weather Statement	DVN	Dubuque, Jackson	40 min
Aug 14, 2:49 PM CDT	Special Weather Statement	DVN	Delaware	41 min
Aug 14, 2:57 PM CDT	Special Weather Statement	DVN	Jackson	48 min
Aug 14, 3:44 PM CDT	Special Weather Statement	DVN	Delaware	46 min
Aug 14, 4:14 PM CDT	Special Weather Statement	DVN	Dubuque	61 min
Aug 14, 4:39 PM CDT	Flash Flood Warning	DVN	Dubuque	2 hr
Aug 14, 1:42 PM CDT	Special Weather Statement	DVN	Stephenson	48 min
Aug 14, 3:17 PM CDT	Special Weather Statement	DVN	Carroll	43 min
Aug 14, 3:25 PM CDT	Special Weather Statement	DVN	Whiteside	50 min
Aug 14, 3:29 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 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.