A stalled frontal boundary over the region helped to trigger showers and thunderstorms.  Some of the storms produced severe weather and flash flooding.

Thunderstorm Wind in GREENE, ILLINOIS
From 12-JUL-11 16:00:00 to 12-JUL-11 16:15:00 (CST-6)
Location: CARROLLTON
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The damage across portions of Greene County was due to damaging downburst winds and localized microbursts embedded within the larger area of downburst winds.  The damage area was generally confined from Carrollton to Greenfield and along Illinois Route 108 over the central and eastern parts of Greene County.  One home in Greenfield was severely damaged as a large tree partially fell through the roof of the home.  A few other large trees also fell on the west side of town.  The western sections of the roof of a large machine shed west of Greenfield were also uplifted and tossed between 50 and 100 yards to the east.  A few other homes in Greenfield sustained minor roof damage as some shingles were removed.  A weather station located southeast of Greenfield measured a wind gust to 74 mph.  Between Carrollton and Greenfield, several corn fields sustained damage as corn was partially bent with pockets of flattened corn.  The area of wind damage extended approximately 14 miles along Illinois Route 108.  The damage was 1.5 miles wide at the beginning of the damage path to 3.5 miles wide at the end.

Hail in MARION, ILLINOIS
From 12-JUL-11 17:49:00 to 12-JUL-11 17:49:00 (CST-6)
Location: TONTI
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in MARION, ILLINOIS
From 12-JUL-11 15:35:00 to 12-JUL-11 17:53:00 (CST-6)
Location: HICKORY HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to three inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including Illinois Route 37 near Walnut Hill Road and Interstate 57 near mile marker 113.

Thunderstorm Wind in ADAMS, ILLINOIS
From 12-JUL-11 14:36:00 to 12-JUL-11 14:36:00 (CST-6)
Location: PLAINVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew over a wind mill on a far just outside of Plainville.

Thunderstorm Wind in MARION, ILLINOIS
From 12-JUL-11 18:10:00 to 12-JUL-11 18:12:00 (CST-6)
Location: IUKA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds snapped off several large trees and blew down numerous tree limbs.  Also, the winds blew off part of a metal roof from a barn and blew in a garage door on a residence.

Thunderstorm Wind in MARION, ILLINOIS
From 12-JUL-11 17:40:00 to 12-JUL-11 17:50:00 (CST-6)
Location: LESTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down several trees along Vermundy Road northwest of Kinmundy.  Also, a tree was blown across Illinois Route 37 about a mile north of Alma and several other trees were blown down in Kinmundy.

Thunderstorm Wind in PIKE, ILLINOIS
From 12-JUL-11 15:25:00 to 12-JUL-11 15:25:00 (CST-6)
Location: NEW HARTFORD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew half of a large tree onto U.S. Highway 54.  Also, several other trees and numerous tree limbs were blown down around town.

Flash Flood in RANDOLPH, ILLINOIS
From 12-JUL-11 18:30:00 to 12-JUL-11 21:15:00 (CST-6)
Location: COULTERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to three inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including County Line Road in several locations, at intersection with Illinois Route 154 and about a mile south of intersection with Illinois Route 13.  At least one car became stranded on a flooded road about 7 miles southeast of Walsh.

Hail in ADAMS, ILLINOIS
From 12-JUL-11 14:31:00 to 12-JUL-11 14:31:00 (CST-6)
Location: (UIN)QUINCY MUNI ARP
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in ADAMS, ILLINOIS
From 12-JUL-11 14:38:00 to 12-JUL-11 14:38:00 (CST-6)
Location: LIBERTY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ADAMS, ILLINOIS
From 12-JUL-11 14:35:00 to 12-JUL-11 14:35:00 (CST-6)
Location: PAYSON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down several trees and power lines.  Also, some shingles were blown off of a home two miles northeast of Payson.

Thunderstorm Wind in JERSEY, ILLINOIS
From 12-JUL-11 15:20:00 to 12-JUL-11 15:21:00 (CST-6)
Location: OTTERVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several trees and numerous tree limbs.  Also, a small shed had two pieces of plywood blown off and a metal awning at a local business was blown off and landed next to a van causing minor damage to the vehicle.

Thunderstorm Wind in PIKE, ILLINOIS
From 12-JUL-11 15:12:00 to 12-JUL-11 15:12:00 (CST-6)
Location: BARRY
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew part of the roof off of the library, causing some water damage to the museum that is on the second floor of the building.  Also, numerous tree limbs and power lines were blown down.