Clusters of thunderstorms drifted east-southeast across southern Illinois. A hot air mass fed north-northeastward into these storms, maintaining a feed of instability. Strong outflow winds ahead of the storms produced isolated damage. After the initial round of storms stabilized the atmosphere, the storms posed more of a heavy rain and flooding threat. The storms occurred along and ahead of a cold front that was draped across southern Illinois and southern Missouri.

Lightning in WABASH, ILLINOIS
From 12-JUL-11 15:45:00 to 12-JUL-11 15:45:00 (CST-6)
Location: MT CARMEL
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

A storage shed on the west side of town was destroyed by an apparent lightning strike.

Thunderstorm Wind in ALEXANDER, ILLINOIS
From 12-JUL-11 20:20:00 to 12-JUL-11 20:20:00 (CST-6)
Location: OLIVE BRANCH
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down over Illinois Route 3.

Thunderstorm Wind in JEFFERSON, ILLINOIS
From 12-JUL-11 17:16:00 to 12-JUL-11 17:16:00 (CST-6)
Location: MT VERNON
Magnitude: 52.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Newspaper

Numerous trees and power lines were brought down. An athletic field fence was damaged. Eleven utility poles were knocked down. About 1,500 utility customers were without power in the city. Power was fully restored by noon the following day.

Heavy Rain in MASSAC, ILLINOIS
From 12-JUL-11 19:55:00 to 12-JUL-11 20:10:00 (CST-6)
Location: ROUND KNOB
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A trained spotter measured 0.78 inches of rain in 15 minutes.

Thunderstorm Wind in WABASH, ILLINOIS
From 12-JUL-11 15:38:00 to 12-JUL-11 15:38:00 (CST-6)
Location: MT CARMEL
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees and power lines were brought down in at least three places. The majority of the east side of Mount Carmel was without power.

Heavy Rain in JEFFERSON, ILLINOIS
From 12-JUL-11 16:53:00 to 12-JUL-11 19:00:00 (CST-6)
Location: MT VERNON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain resulted in flooding of several city streets.

Thunderstorm Wind in MASSAC, ILLINOIS
From 12-JUL-11 20:05:00 to 12-JUL-11 20:05:00 (CST-6)
Location: NEW COLUMBIA
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 5.00K
Reported by: Emergency Manager

A barn was blown down. The barn was estimated to be about 70 years old. The barn was about 30 feet tall and likely contained a hay loft. Large tree limbs were blown down nearby. A nearby corn field was partially flattened.

Heavy Rain in WABASH, ILLINOIS
From 12-JUL-11 15:15:00 to 12-JUL-11 16:24:00 (CST-6)
Location: MT CARMEL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Street flooding was reported. There were several inches of moving water across at least one street.

Flash Flood in JACKSON, ILLINOIS
From 12-JUL-11 19:25:00 to 12-JUL-11 20:15:00 (CST-6)
Location: BARR
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Torrential rains caused street flooding in Carbondale. A few vehicles were stranded in floodwater.

Heavy Rain in PERRY, ILLINOIS
From 12-JUL-11 18:45:00 to 12-JUL-11 20:35:00 (CST-6)
Location: DU QUOIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Street flooding occurred on the outer lanes of U.S. Highway 51 near DuQuoin.

Funnel Cloud in WAYNE, ILLINOIS
From 12-JUL-11 14:10:00 to 12-JUL-11 14:10:00 (CST-6)
Location: FAIRFIELD MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A rope-like funnel cloud was photographed over the Fairfield Municipal Airport. The photographer stated the funnel cloud briefly dipped to within 200 to 300 feet of the ground.