A strong cold front moved through the region, triggering showers and thunderstorms.  Some of the thunderstorms produced large hail and damaging winds.

Hail in MADISON, ILLINOIS
From 17-JAN-12 02:17:00 to 17-JAN-12 02:17:00 (CST-6)
Location: GRANITE CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 17-JAN-12 02:24:00 to 17-JAN-12 02:24:00 (CST-6)
Location: MARYVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 17-JAN-12 02:30:00 to 17-JAN-12 02:30:00 (CST-6)
Location: TROY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 17-JAN-12 02:40:00 to 17-JAN-12 02:40:00 (CST-6)
Location: ATLEE OGLES
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds destroyed an outbuilding on the north side of Belleville West High School.  Also, the tops of several trees were snapped off in the area and a small shed was destroyed.  Two sets of small bleachers were blown over.

Hail in CLINTON, ILLINOIS
From 17-JAN-12 03:07:00 to 17-JAN-12 03:07:00 (CST-6)
Location: AVISTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 17-JAN-12 03:08:00 to 17-JAN-12 03:08:00 (CST-6)
Location: MILLSTADT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several power lines in town.

Thunderstorm Wind in CLINTON, ILLINOIS
From 17-JAN-12 03:07:00 to 17-JAN-12 03:07:00 (CST-6)
Location: AVISTON
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CLINTON, ILLINOIS
From 17-JAN-12 03:12:00 to 17-JAN-12 03:12:00 (CST-6)
Location: BREESE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down a two foot diameter tree limb.

Hail in CLINTON, ILLINOIS
From 17-JAN-12 03:21:00 to 17-JAN-12 03:21:00 (CST-6)
Location: CARLYLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CLINTON, ILLINOIS
From 17-JAN-12 03:21:00 to 17-JAN-12 03:21:00 (CST-6)
Location: CARLYLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down several large tree limbs around town.

Hail in ST. CLAIR, ILLINOIS
From 17-JAN-12 03:22:00 to 17-JAN-12 03:22:00 (CST-6)
Location: FREEBURG
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail caused minor damage to several cars in town.

Hail in MADISON, ILLINOIS
From 17-JAN-12 05:14:00 to 17-JAN-12 05:14:00 (CST-6)
Location: COLLINSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLINTON, ILLINOIS
From 17-JAN-12 05:35:00 to 17-JAN-12 05:35:00 (CST-6)
Location: BREESE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLINTON, ILLINOIS
From 17-JAN-12 05:40:00 to 17-JAN-12 05:40:00 (CST-6)
Location: CARLYLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WASHINGTON, ILLINOIS
From 17-JAN-12 03:48:00 to 17-JAN-12 03:48:00 (CST-6)
Location: ADDIEVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew the skylight and doors off of a shed on a farm northeast of Addieville.  Also, five windsow were blown out on an unoccupied farm house and a grain auger was blown over.  The debris was scattered up to half a mile from the farmstead.