Alert archive / Illinois / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 227, NWS Quad Cities, IA

August 17, 2023Henry County, Mercer County, Warren County, Illinois

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 17, 2023, 6:21 AM CDT for Henry County, Mercer County, Warren County, Illinois. It was in force for 24 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 17, 2023, 6:21 AM CDT (11:21 UTC)
Expired
Aug 17, 2023, 6:45 AM CDT
In force
24 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Henry County, IL, Mercer County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 53 km from the middle of the area, began a volume at 11:23 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.

What was reported inside it

TimeReportWhereRemark
Aug 17, 6:30 AM CDTHAIL 1.252 Sse Osborn, IL
Aug 17, 6:34 AM CDTHAIL 14 N Geneseo, IL
Aug 17, 6:34 AM CDTHAIL 1.751 Nne Geneseo, ILGolfball sized hail.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 11.4 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 2023-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2023-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1451 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 5:13 AM CDTSpecial Weather StatementDVNLouisa32 min
Aug 17, 5:39 AM CDTSpecial Weather StatementDVNLouisa36 min
Aug 17, 5:49 AM CDTSevere Thunderstorm WarningDVNLouisa41 min
Aug 17, 4:52 AM CDTSpecial Weather StatementDVNStephenson23 min
Aug 17, 5:57 AM CDTSpecial Weather StatementDVNCarroll18 min
Aug 17, 6:27 AM CDTSpecial Weather StatementDVNHenry33 min
Aug 17, 6:43 AM CDTSpecial Weather StatementDVNBureau47 min
Aug 17, 7:19 AM CDTSevere Thunderstorm WarningDVNMcDonough26 min
Aug 17, 7:34 AM CDTSpecial Weather StatementDVNPutnam26 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.