Alert archive / Illinois / Severe Thunderstorm Warnings in 2025
Severe Thunderstorm Warning 206, NWS Lincoln, IL
NWS Lincoln, IL issued this severe thunderstorm warning at Aug 18, 2025, 5:56 PM CDT for Knox County, Illinois. It was in force for 49 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 18, 2025, 5:56 PM CDT (22:56 UTC)
- Expired
- Aug 18, 2025, 6:45 PM CDT
- In force
- 49 min
- Issued by
- NWS Lincoln, IL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Knox County, IL
The radar
The Quad Cities radar (KDVN), 82 km from the middle of the area, began a volume at 23:00 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
Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 162 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.
- Mixed-layer CAPE
- 1509 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 1143 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.2
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 Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 2:16 PM CDT, 3 hours 40 minutes earlier.
Area forecast discussion, Aug 18, 2:16 PM CDT, 3 hours 40 minutes before
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</html>Hazardous weather outlook, Aug 18, 2:05 PM CDT, 3 hours 51 minutes before
Hazardous Weather Outlook National Weather Service Lincoln IL 205 PM CDT Mon Aug 18 2025 ILZ027>031-036>038-040>057-061>063-066>068-191915- Knox-Stark-Peoria-Marshall-Woodford-Fulton-Tazewell-McLean-Schuyler- Mason-Logan-De Witt-Piatt-Champaign-Vermilion-Cass-Menard-Scott- Morgan-Sangamon-Christian-Macon-Moultrie-Douglas-Coles-Edgar-Shelby- Cumberland-Clark-Effingham-Jasper-Crawford- 205 PM CDT Mon Aug 18 2025 This Hazardous Weather Outlook is for central Illinois, east central Illinois, southeast Illinois and west central Illinois. .DAY ONE...Tonight. Heat indices will slowly fall from the triple digits early this evening into the mid 70s overnight. Scattered thunderstorms are possible this evening into tonight (30 to 40% chance). Any storm that develops will be capable of frequent lightning, heavy rain, and locally strong winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. There is a 30-50% chance of thunderstorms Tuesday, with the highest chances during the morning. Severe weather is not expected, but locally heavy rain and frequent lightning are possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. ILZ071>073-191915- Clay-Richland-Lawrence- 205 PM CDT Mon Aug 18 2025 This Hazardous Weather Outlook is for southeast Illinois. .DAY ONE...Tonight. Heat indices will slowly fall from the triple digits early this evening into the mid 70s overnight. Scattered thunderstorms are possible this evening into tonight (20 to 30% chance). Any storm that develops will be capable of frequent lightning, heavy rain, and locally strong winds. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. The combination of heat and humidity is forecast to result in heat indices of 100 to 105 Tuesday afternoon. There is a 30-40% chance of thunderstorms Tuesday. Severe weather is not expected, but locally heavy rain and frequent lightning are possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated tonight. Bumgardner
The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 6:26 PM CDT | Special Weather Statement | ILX | Stark | 34 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2025Every severe thunderstorm warning in 2025
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.