A squall line containing several embedded bow echo structures moved eastward across southern Illinois. These bow echoes moved east-northeast around 45 mph, producing swaths of wind damage and isolated large hail. These storms were associated with a 500 mb short wave trough moving east across the mid Mississippi Valley. Sufficient moisture and instability ahead of the line, coupled with strengthening winds aloft, supported forward propagation of the line into Indiana. On the evening prior to this outbreak, an isolated severe storm occurred over White County.

Thunderstorm Wind in PERRY, ILLINOIS
From 27-JUN-08 17:00:00 to 27-JUN-08 17:00:00 (CST-6)
Location: DU QUOIN
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

On the north edge of Du Quoin, a state trooper reported trees were blown down by winds of at least 70 mph. Just east of town, a metal barn was destroyed. Debris from the 120 by 80 foot barn was spread one-half to one mile across a field.

Tornado in JEFFERSON, ILLINOIS
From 27-JUN-08 16:59:00 to 27-JUN-08 17:00:00 (CST-6)
Location: MT VERNON
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The funnel cloud which was observed over Mount Vernon briefly touched down several miles east of town. Trained witnesses reported very pronounced rotation with the funnel cloud. The funnel was photographed at or very close to the ground, but trees obscured the possible touchdown point. There was minimal damage, with the exception of a downed power pole and a tree. Maximum wind speeds were estimated around 70 mph.

Thunderstorm Wind in SALINE, ILLINOIS
From 27-JUN-08 18:05:00 to 27-JUN-08 18:05:00 (CST-6)
Location: HARRISBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees and power lines were down.

Thunderstorm Wind in WHITE, ILLINOIS
From 27-JUN-08 18:04:00 to 27-JUN-08 18:04:00 (CST-6)
Location: GRAYVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees were damaged at the homes of at least three residences.

Thunderstorm Wind in WAYNE, ILLINOIS
From 27-JUN-08 17:35:00 to 27-JUN-08 17:35:00 (CST-6)
Location: FAIRFIELD
Magnitude: 50.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two trees were down across U.S. Highway 45.

Hail in JEFFERSON, ILLINOIS
From 27-JUN-08 16:59:00 to 27-JUN-08 16:59:00 (CST-6)
Location: MT VERNON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Funnel Cloud in JEFFERSON, ILLINOIS
From 27-JUN-08 16:35:00 to 27-JUN-08 16:45:00 (CST-6)
Location: MT VERNON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A supercell thunderstorm produced a funnel cloud that passed over the city of Mount Vernon from northwest to southeast. The funnel cloud was photographed at several points during its lifespan. Witnesses reported pronounced rotation. Shortly before the funnel briefly touched down, it was observed by a spotter from the junction of Interstates 64 and 57 looking east.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 27-JUN-08 17:10:00 to 27-JUN-08 17:10:00 (CST-6)
Location: INA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

A greenhouse was blown into a cornfield near Rend Lake College.

Thunderstorm Wind in WABASH, ILLINOIS
From 27-JUN-08 18:03:00 to 27-JUN-08 18:03:00 (CST-6)
Location: MT CARMEL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The 70 mph wind gust was estimated by spotters and relayed through emergency management.

Thunderstorm Wind in PERRY, ILLINOIS
From 27-JUN-08 17:05:00 to 27-JUN-08 17:05:00 (CST-6)
Location: DU QUOIN
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines were down. A large barn was moved off its foundation. There was shingle damage to a residence.

Thunderstorm Wind in JACKSON, ILLINOIS
From 27-JUN-08 17:15:00 to 27-JUN-08 17:25:00 (CST-6)
Location: CARBONDALE
Magnitude: 52.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down, mostly south of downtown Carbondale. Several small trees were down on the Southern Illinois University campus. A couple of roads were blocked two to four miles south of Carbondale, including Old U.S. 51. Elsewhere in the area, a roof was damaged, a tree was down, and canoes were thrown 100 feet.

Thunderstorm Wind in WHITE, ILLINOIS
From 26-JUN-08 18:15:00 to 26-JUN-08 18:15:00 (CST-6)
Location: NEW HAVEN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees were blown down on Route 141. Police and highway workers rerouted traffic around the area.

Heavy Rain in WHITE, ILLINOIS
From 26-JUN-08 18:20:00 to 26-JUN-08 20:00:00 (CST-6)
Location: NEW HAVEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A portion of Highway 141 was flooded. Traffic was detoured around the flooded section.

Thunderstorm Wind in FRANKLIN, ILLINOIS
From 27-JUN-08 17:20:00 to 27-JUN-08 17:30:00 (CST-6)
Location: BENTON
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS meteorologist reported several large trees were down, blocking Route 37.

Hail in PERRY, ILLINOIS
From 27-JUN-08 17:05:00 to 27-JUN-08 17:05:00 (CST-6)
Location: DU QUOIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media