Elevated convection fired up across the region north of a warm front that was just south of the Missouri/Arkansas border.  There were numerous reports of large hail.

Hail in WASHINGTON, ILLINOIS
From 02-MAR-12 11:38:00 to 02-MAR-12 11:41:00 (CST-6)
Location: NEW MINDEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:10:00 to 02-MAR-12 06:10:00 (CST-6)
Location: ALTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:10:00 to 02-MAR-12 06:10:00 (CST-6)
Location: GODFREY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:16:00 to 02-MAR-12 06:16:00 (CST-6)
Location: EAST ALTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:22:00 to 02-MAR-12 06:22:00 (CST-6)
Location: BETHALTO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:25:00 to 02-MAR-12 06:25:00 (CST-6)
Location: EDWARDSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, ILLINOIS
From 02-MAR-12 06:44:00 to 02-MAR-12 06:44:00 (CST-6)
Location: NEW DOUGLAS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, ILLINOIS
From 02-MAR-12 07:10:00 to 02-MAR-12 07:10:00 (CST-6)
Location: NOKOMIS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FAYETTE, ILLINOIS
From 02-MAR-12 07:20:00 to 02-MAR-12 07:22:00 (CST-6)
Location: RAMSEY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FAYETTE, ILLINOIS
From 02-MAR-12 07:30:00 to 02-MAR-12 07:30:00 (CST-6)
Location: DRESSOR
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in CLINTON, ILLINOIS
From 02-MAR-12 10:11:00 to 02-MAR-12 10:12:00 (CST-6)
Location: NEW BADEN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado briefly touched down just west of Illinois Route 160 about a mile north of New Baden.  As it travelled to the east it caused minor roof damage to several homes in a subdivision and topped off several trees.  A couple of fences were blow over as well.  It crossed Illinois Route 160, just south of intersection with Court Road, lifting and dissipating about a quarter of a mile east of Illinois Route 160.

Hail in ST. CLAIR, ILLINOIS
From 02-MAR-12 10:00:00 to 02-MAR-12 10:00:00 (CST-6)
Location: O FALLON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLINTON, ILLINOIS
From 02-MAR-12 10:15:00 to 02-MAR-12 10:15:00 (CST-6)
Location: AVISTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLINTON, ILLINOIS
From 02-MAR-12 10:21:00 to 02-MAR-12 10:21:00 (CST-6)
Location: ST ROSE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. CLAIR, ILLINOIS
From 02-MAR-12 10:00:00 to 02-MAR-12 10:00:00 (CST-6)
Location: CHENOT PLACE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused minor shingle damage to a few homes just east southeast of Belleville.

Hail in FAYETTE, ILLINOIS
From 02-MAR-12 11:20:00 to 02-MAR-12 11:20:00 (CST-6)
Location: FARINA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARION, ILLINOIS
From 02-MAR-12 11:15:00 to 02-MAR-12 11:15:00 (CST-6)
Location: KINMUNDY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WASHINGTON, ILLINOIS
From 02-MAR-12 11:38:00 to 02-MAR-12 11:38:00 (CST-6)
Location: NASHVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARION, ILLINOIS
From 02-MAR-12 11:50:00 to 02-MAR-12 11:50:00 (CST-6)
Location: CENTRALIA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARION, ILLINOIS
From 02-MAR-12 11:55:00 to 02-MAR-12 12:00:00 (CST-6)
Location: SEDAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, ILLINOIS
From 02-MAR-12 07:03:00 to 02-MAR-12 07:03:00 (CST-6)
Location: COFFEEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter