A bow-shaped line of severe thunderstorms moved southeast across southern Illinois, producing scattered areas of wind damage. The storms moved through a pool of moderate to strong instability, where mixed-layer cape ranged from 3000 to 3500 J/kg. The storms weakened later in the evening as they moved southward into an area of weaker deep-layer winds. The line of storms originated over the central Plains and upper Mississippi Valley earlier in the day. Despite moving far from the disturbance that triggered them, the storms remained intense as they fed off strong instability.

Thunderstorm Wind in FRANKLIN, ILLINOIS
From 10-AUG-20 18:30:00 to 10-AUG-20 18:30:00 (CST-6)
Location: SESSER
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tree damage was reported across the area.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 10-AUG-20 18:39:00 to 10-AUG-20 18:39:00 (CST-6)
Location: BELLE RIVE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A wind gust to 64 mph was measured on a Davis weather station.

Thunderstorm Wind in HAMILTON, ILLINOIS
From 10-AUG-20 18:40:00 to 10-AUG-20 18:55:00 (CST-6)
Location: DAHLGREN
Magnitude: 56.00 MG
Property damage: 10.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Trees were damaged on the south end of Dahlgren. Several fields of corn sustained wind damage from Dahlgren to near Delafield. On the east side of Highway 142 east of Delafield, some large trees were uprooted. A wind gust to 64 mph was measured on a Davis weather station along the Hamilton/Jefferson County line.

Thunderstorm Wind in PERRY, ILLINOIS
From 10-AUG-20 18:08:00 to 10-AUG-20 18:08:00 (CST-6)
Location: CUTLER
Magnitude: 65.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power was out, and five-inch tree limbs were down. A trained spotter estimated wind gusts near 75 mph.

Thunderstorm Wind in PERRY, ILLINOIS
From 10-AUG-20 18:25:00 to 10-AUG-20 18:25:00 (CST-6)
Location: PINCKNEYVILLE
Magnitude: 56.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Branches were blown down. A tree was down on a house.

Thunderstorm Wind in JACKSON, ILLINOIS
From 10-AUG-20 18:20:00 to 10-AUG-20 18:20:00 (CST-6)
Location: AVA
Magnitude: 56.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were down on vehicles and roadways in the Ava area.

Thunderstorm Wind in JACKSON, ILLINOIS
From 10-AUG-20 18:36:00 to 10-AUG-20 18:36:00 (CST-6)
Location: MURPHYSBORO
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were down in multiple locations.

Thunderstorm Wind in FRANKLIN, ILLINOIS
From 10-AUG-20 18:33:00 to 10-AUG-20 18:42:00 (CST-6)
Location: CHRISTOPHER
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Trained Spotter

From Zeigler to Christopher, a trained spotter reported lots of trees were down, and power was out.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 10-AUG-20 18:35:00 to 10-AUG-20 18:35:00 (CST-6)
Location: MT VERNON
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large hickory tree was blown down. Many limbs were broken off a Bradford pear tree.

Thunderstorm Wind in SALINE, ILLINOIS
From 10-AUG-20 19:07:00 to 10-AUG-20 19:13:00 (CST-6)
Location: RALEIGH
Magnitude: 65.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were down. Some roof damage occurred. Power was out. The area of damage was mainly near and north of Harrisburg.

Thunderstorm Wind in WHITE, ILLINOIS
From 10-AUG-20 19:20:00 to 10-AUG-20 19:35:00 (CST-6)
Location: CARMI
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: COOP Observer

Tree limbs were down in Carmi and across the county.