A stationary frontal boundary served as the focusing mechanism for scattered thunderstorms during the late afternoon and early evening hours of July 12th.  Most of the storms occurred along and southwest of a Springfield to Robinson line.  Isolated wind damage was reported, as well as localized flash flooding across parts of southeast Illinois.

Thunderstorm Wind in SANGAMON, ILLINOIS
From 12-JUL-11 14:47:00 to 12-JUL-11 14:52:00 (CST-6)
Location: CHATHAM
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Power lines were blown down east of Chatham.

Thunderstorm Wind in LAWRENCE, ILLINOIS
From 12-JUL-11 16:40:00 to 12-JUL-11 16:45:00 (CST-6)
Location: SUMNER
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were blown down in Sumner.

Thunderstorm Wind in LAWRENCE, ILLINOIS
From 12-JUL-11 17:05:00 to 12-JUL-11 17:10:00 (CST-6)
Location: LAWRENCEVILLE
Magnitude: 52.00 EG
Property damage: 55.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous tree branches and power lines were blown down in Lawrenceville.

Thunderstorm Wind in RICHLAND, ILLINOIS
From 12-JUL-11 18:10:00 to 12-JUL-11 18:15:00 (CST-6)
Location: OLNEY
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous tree branches and power lines were blown down in Olney.

Hail in LAWRENCE, ILLINOIS
From 12-JUL-11 16:46:00 to 12-JUL-11 16:47:00 (CST-6)
Location: SUMNER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in CLAY, ILLINOIS
From 12-JUL-11 15:30:00 to 12-JUL-11 21:00:00 (CST-6)
Location: OSKALOOSA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain of 3.00 to 4.00 inches in a two hour period during the late afternoon produced flash flooding in southwest Clay County. Many rural roads were inundated with water flowing over them, and U.S. Highway 50 was impassable in spots.

Flash Flood in LAWRENCE, ILLINOIS
From 12-JUL-11 18:30:00 to 12-JUL-11 22:00:00 (CST-6)
Location: SUMNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain of 3.00 to 4.00 inches in a two hour period during the early evening produced flash flooding in western Lawrence County. Many rural roads were inundated with water flowing over them, and U.S. Highway 50 was impassable in spots.

Flash Flood in RICHLAND, ILLINOIS
From 12-JUL-11 18:30:00 to 12-JUL-11 22:00:00 (CST-6)
Location: AMITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain of 3.00 to 4.00 inches in a two hour period during the early evening produced flash flooding in southeast Richland County. Many rural roads around Claremont were inundated with water flowing over them, and U.S. Highway 50 was impassable in spots.

Flash Flood in JASPER, ILLINOIS
From 12-JUL-11 18:30:00 to 12-JUL-11 22:30:00 (CST-6)
Location: ST MARIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain of 3.00 to 6.00 inches in a three hour period during the early evening produced flash flooding in southeast Jasper County. Many rural roads southeast of Ste. Marie were inundated with water flowing over them.

Flash Flood in CRAWFORD, ILLINOIS
From 12-JUL-11 18:30:00 to 12-JUL-11 22:30:00 (CST-6)
Location: PIERCEBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain of 3.00 to 6.00 inches in a three hour period during the early evening produced flash flooding in southwest Crawford County. Many rural roads south of Oblong were inundated with water flowing over them.