A warm front was lifting northward through forecast area.  Severe storms developed along and north of the boundary.  There were numerous reports of large hail with these storms.

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 12:28:00 to 28-MAY-11 12:29:00 (CST-6)
Location: LITCHFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GREENE, ILLINOIS
From 28-MAY-11 12:30:00 to 28-MAY-11 12:30:00 (CST-6)
Location: ELDRED
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GREENE, ILLINOIS
From 28-MAY-11 12:40:00 to 28-MAY-11 12:40:00 (CST-6)
Location: CARROLLTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GREENE, ILLINOIS
From 28-MAY-11 12:50:00 to 28-MAY-11 12:50:00 (CST-6)
Location: ROCKBRIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JERSEY, ILLINOIS
From 28-MAY-11 12:52:00 to 28-MAY-11 12:52:00 (CST-6)
Location: KEMPER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MACOUPIN, ILLINOIS
From 28-MAY-11 13:00:00 to 28-MAY-11 13:00:00 (CST-6)
Location: CHESTERFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MACOUPIN, ILLINOIS
From 28-MAY-11 13:05:00 to 28-MAY-11 13:08:00 (CST-6)
Location: ENOS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in MACOUPIN, ILLINOIS
From 28-MAY-11 13:08:00 to 28-MAY-11 13:12:00 (CST-6)
Location: MACOUPIN STATION
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MACOUPIN, ILLINOIS
From 28-MAY-11 13:21:00 to 28-MAY-11 13:21:00 (CST-6)
Location: ATWATER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:25:00 to 28-MAY-11 13:30:00 (CST-6)
Location: LAKE LOU YAEGER
Magnitude: 4.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Most of the hail was quarter to ping pong ball size, though a few of the hail stones were softball size.

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:37:00 to 28-MAY-11 13:37:00 (CST-6)
Location: HILLSBORO
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:40:00 to 28-MAY-11 13:42:00 (CST-6)
Location: IRVING
Magnitude: 4.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lots of large hail fell over town, so of the hail stones were up to softball size.  A few cars had their windows broken on them.

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:52:00 to 28-MAY-11 13:52:00 (CST-6)
Location: NOKOMIS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:35:00 to 28-MAY-11 13:35:00 (CST-6)
Location: BUTLER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to baseball size damaged a number of car windows in town.  Also,  there were several reports of siding and roof damage due to the large hail.

Hail in MONTGOMERY, ILLINOIS
From 28-MAY-11 13:29:00 to 28-MAY-11 13:29:00 (CST-6)
Location: LITCHFIELD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter