Severe thunderstorms developed ahead of a strong cold front, triggering numerous showers and thunderstorms.  A number of tornadoes were reported as well as damaging winds and large hail.

Hail in MONROE, ILLINOIS
From 31-DEC-10 12:11:00 to 31-DEC-10 12:11:00 (CST-6)
Location: COLUMBIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CLAIR, ILLINOIS
From 31-DEC-10 12:20:00 to 31-DEC-10 12:20:00 (CST-6)
Location: BELLEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONROE, ILLINOIS
From 31-DEC-10 12:17:00 to 31-DEC-10 12:17:00 (CST-6)
Location: WATERLOO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MONROE, ILLINOIS
From 31-DEC-10 12:15:00 to 31-DEC-10 12:15:00 (CST-6)
Location: COLUMBIA
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 31-DEC-10 12:20:00 to 31-DEC-10 12:20:00 (CST-6)
Location: BELLEVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several power poles around town.

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 31-DEC-10 12:26:00 to 31-DEC-10 12:26:00 (CST-6)
Location: MASCOUTAH
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew some siding off of a house and outbuildings.

Tornado in CALHOUN, ILLINOIS
From 31-DEC-10 11:56:00 to 31-DEC-10 11:59:00 (CST-6)
Location: MOZIER
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down three miles north northwest of Mozier in the Calhoun County conservation area called Rip Rap Landing.  It crossed Illinois Route 96 near West Panther Creek Road and then traveled northeast crossing Hootowl Hollow Road before dissipating just west of Hillcrest.  Damage was confined to uprooted trees.

Tornado in BOND, ILLINOIS
From 31-DEC-10 13:05:00 to 31-DEC-10 13:07:00 (CST-6)
Location: DURLEY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down on the north side of Greenville near the intersection of North Hena Street and North Dewey Street.  An agricultural building at the high school sustained roof damage with some additional minor roof and tree damage noticed at an adjacent house.  The tornado then moved northeast causing significant damage to a large tree on the north side of Illinois Route 140.  Minor roof and siding damage was noted on several houses on Cloverfield Lane and North Idler Lane.  The tornado continued northeast producing additional minor roof and tree damage on Country Club and Woburn Roads before dissipating.

Thunderstorm Wind in PIKE, ILLINOIS
From 31-DEC-10 10:52:00 to 31-DEC-10 10:52:00 (CST-6)
Location: MARTINSBURG
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down a large tree just north of Martinsburg.

Hail in PIKE, ILLINOIS
From 31-DEC-10 10:57:00 to 31-DEC-10 11:00:00 (CST-6)
Location: PITTSFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in ST. CLAIR, ILLINOIS
From 31-DEC-10 12:30:00 to 31-DEC-10 12:31:00 (CST-6)
Location: LEBANON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down just west of Emerald Mound Grange Road, south of Midgley Neiss Road.  It traveled to the northeast crossing Emerald Mound Grange Road, then lifted a short time later.  The tornado damaged a few outbuildings and trees on a farmstead on the west side of the road.