Thunderstorms moved across parts of northern Illinois from late morning through the afternoon and into the evening hours of March 20th.  Numerous reports of small hail, some covering the ground were received with additional reports of hail ranging from penny to quarter size.  Heavy rain also occurred with these storms producing minor flooding.

Hail in KANE, ILLINOIS
From 20-MAR-11 13:32:00 to 20-MAR-11 13:33:00 (CST-6)
Location: STARKS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail to the size of pennies was reported near Burlington and Romke Roads.

Hail in WINNEBAGO, ILLINOIS
From 20-MAR-11 13:47:00 to 20-MAR-11 13:48:00 (CST-6)
Location: EAST ROCKFORD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported on the southeast side of Rockford.

Hail in WINNEBAGO, ILLINOIS
From 20-MAR-11 13:47:00 to 20-MAR-11 13:49:00 (CST-6)
Location: (RFD)GTR ROCKFORD AR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported at Rockford Airport.

Hail in WINNEBAGO, ILLINOIS
From 20-MAR-11 13:50:00 to 20-MAR-11 13:52:00 (CST-6)
Location: ROCKFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported on the south side of Rockford.

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 13:54:00 to 20-MAR-11 13:55:00 (CST-6)
Location: HARVARD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 13:54:00 to 20-MAR-11 13:55:00 (CST-6)
Location: HARVARD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 14:20:00 to 20-MAR-11 14:25:00 (CST-6)
Location: CRYSTAL LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel to quarter size hail fell for about five minutes.

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 14:26:00 to 20-MAR-11 14:27:00 (CST-6)
Location: SILVER LAKES
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 14:26:00 to 20-MAR-11 14:29:00 (CST-6)
Location: HUNTLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel to quarter size hail was reported near Route 47 and Reed Road.

Hail in LAKE, ILLINOIS
From 20-MAR-11 15:05:00 to 20-MAR-11 15:07:00 (CST-6)
Location: VERNON HILLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 15:09:00 to 20-MAR-11 15:12:00 (CST-6)
Location: CRYSTAL LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 15:09:00 to 20-MAR-11 15:11:00 (CST-6)
Location: LAKEMOOR
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LAKE, ILLINOIS
From 20-MAR-11 17:35:00 to 20-MAR-11 17:36:00 (CST-6)
Location: LIBERTYVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DU PAGE, ILLINOIS
From 20-MAR-11 18:51:00 to 20-MAR-11 18:54:00 (CST-6)
Location: BUTTERFIELD WEST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported near Roosevelt Road and Park Boulevard.

Hail in MCHENRY, ILLINOIS
From 20-MAR-11 17:00:00 to 20-MAR-11 17:02:00 (CST-6)
Location: HARVARD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported near Route 173 and Route 14.

Flood in WINNEBAGO, ILLINOIS
From 20-MAR-11 12:00:00 to 20-MAR-11 15:00:00 (CST-6)
Location: WEMPLETON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Minor street flooding was reported in many areas in Rockford, especially in intersections and near storm sewers.  Standing water up to 10 inches deep was reported in a few locations.