Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 219, NWS Quad Cities, IA

August 11, 20235 counties in Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 11, 2023, 5:53 AM CDT for 5 counties in Illinois. It was in force for 37 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 11, 2023, 5:53 AM CDT (10:53 UTC)
Expired
Aug 11, 2023, 6:30 AM CDT
In force
37 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Henderson County, IL, Henry County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 53 km from the middle of the area, began a volume at 10:56 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, 10.9 hours before the alert went out and 54 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2023-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 714 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2023-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
714 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1310 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 2:51 AM CDTSpecial Weather StatementDVNBenton, Buchanan, Iowa, Johnson, Linn39 min
Aug 11, 3:19 AM CDTSpecial Weather StatementDVNBuchanan, Delaware41 min
Aug 11, 3:52 AM CDTSpecial Weather StatementDVNCedar, Delaware, Dubuque, Jones, Linn38 min
Aug 11, 4:24 AM CDTSpecial Weather StatementDVNJefferson, Keokuk, Washington51 min
Aug 11, 5:24 AM CDTSpecial Weather StatementDVNDes Moines, Henry, Jefferson66 min
Aug 11, 6:12 AM CDTSpecial Weather StatementDVNDes Moines, Lee48 min
Aug 11, 6:54 AM CDTSpecial Weather StatementDVNLee51 min
Aug 11, 5:37 AM CDTSpecial Weather StatementDVNMercer, Rock Island38 min
Aug 11, 6:17 AM CDTSevere Thunderstorm WarningDVNHenderson, Henry, Mercer, Warren43 min
Aug 11, 7:40 AM CDTSpecial Weather StatementDVNMcDonough50 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2023Every 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.