During the late morning and early afternoon hours of August 13th, a line of severe thunderstorms developed across northern Illinois.

Hail in COOK, ILLINOIS
From 13-AUG-11 12:30:00 to 13-AUG-11 12:31:00 (CST-6)
Location: PALATINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in KENDALL, ILLINOIS
From 13-AUG-11 14:20:00 to 13-AUG-11 14:21:00 (CST-6)
Location: YORKVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in COOK, ILLINOIS
From 13-AUG-11 12:43:00 to 13-AUG-11 12:43:00 (CST-6)
Location: WILMETTE
Magnitude: 35.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winds estimated to 40 mph caused a large branch to fall onto a car trapping a motorist near Gross Point Road and Park Place.  No injuries were reported.

Hail in COOK, ILLINOIS
From 13-AUG-11 12:48:00 to 13-AUG-11 12:48:00 (CST-6)
Location: EVANSTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell at Davis Street and Oak Avenue.

Hail in COOK, ILLINOIS
From 13-AUG-11 12:57:00 to 13-AUG-11 13:01:00 (CST-6)
Location: HANSON PARK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail between a half inch and one inch fell near Harlem Avenue and Chicago Avenue.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 12:59:00 to 13-AUG-11 13:01:00 (CST-6)
Location: NAPERVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell near the intersection of 75th Street and Rickert Drive.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:01:00 to 13-AUG-11 13:02:00 (CST-6)
Location: NAPERVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OGLE, ILLINOIS
From 13-AUG-11 13:02:00 to 13-AUG-11 13:03:00 (CST-6)
Location: FORRESTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:03:00 to 13-AUG-11 13:04:00 (CST-6)
Location: OAK BROOK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to quarter size fell near Butterfield Road and 22nd Street.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:04:00 to 13-AUG-11 13:06:00 (CST-6)
Location: BRANDYWINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported near Route 83 and Butterfield Road.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:09:00 to 13-AUG-11 13:11:00 (CST-6)
Location: LISLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to the size of quarters was reported near Yackley Avenue and Ohio Street.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:13:00 to 13-AUG-11 13:17:00 (CST-6)
Location: BELMONT RD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to the size of quarters was reported across portions of Downers Grove, including penny size hail near Dunham Road and Maple Avenue.

Hail in COOK, ILLINOIS
From 13-AUG-11 13:21:00 to 13-AUG-11 13:23:00 (CST-6)
Location: CLYBOURN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Up to penny size hail fell near West Erie Street.

Hail in GRUNDY, ILLINOIS
From 13-AUG-11 13:50:00 to 13-AUG-11 13:52:00 (CST-6)
Location: MORRIS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Penny size hail was reported near Spruce Street and Main Street.

Hail in WILL, ILLINOIS
From 13-AUG-11 15:02:00 to 13-AUG-11 15:03:00 (CST-6)
Location: PEOTONE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in LA SALLE, ILLINOIS
From 13-AUG-11 15:13:00 to 13-AUG-11 15:14:00 (CST-6)
Location: LAKE HOLIDAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IROQUOIS, ILLINOIS
From 13-AUG-11 15:26:00 to 13-AUG-11 15:34:00 (CST-6)
Location: CLIFTON
Magnitude: 2.00 
Property damage: 5.00K
Reported by: Public

Windows on farm buildings shattered and vegetation was damaged near 900 East Road and 3100 North Road.

Thunderstorm Wind in IROQUOIS, ILLINOIS
From 13-AUG-11 15:26:00 to 13-AUG-11 15:26:00 (CST-6)
Location: CLIFTON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 12-inch tree was split in half near 900 East Road and 3100 North Road.

Flood in WINNEBAGO, ILLINOIS
From 13-AUG-11 16:04:00 to 13-AUG-11 17:00:00 (CST-6)
Location: SAMUELSON CORNERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flowing water was reported on Mulford Road near Sandy Hollow Road and State Street.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:15:00 to 13-AUG-11 13:17:00 (CST-6)
Location: WOODRIDGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to penny size hail fell across portions of Woodridge, including near the intersection of 75th Street and Woodridge Drive.

Hail in WINNEBAGO, ILLINOIS
From 13-AUG-11 10:03:00 to 13-AUG-11 10:03:00 (CST-6)
Location: PECATONICA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Pea to nickel size hail was reported.

Hail in WINNEBAGO, ILLINOIS
From 13-AUG-11 10:37:00 to 13-AUG-11 10:37:00 (CST-6)
Location: ROCKFORD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Pea to nickel size hail was reported.

Hail in OGLE, ILLINOIS
From 13-AUG-11 11:04:00 to 13-AUG-11 11:04:00 (CST-6)
Location: DAYSVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IROQUOIS, ILLINOIS
From 13-AUG-11 16:12:00 to 13-AUG-11 16:14:00 (CST-6)
Location: WELLINGTON
Magnitude: 1.25 
Property damage: 0.00K
Reported by: Trained Spotter

Some crop damage was caused by hail up to the size of half dollars.

Hail in DU PAGE, ILLINOIS
From 13-AUG-11 13:20:00 to 13-AUG-11 13:25:00 (CST-6)
Location: WESTMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported at Prospect Avenue and Park Avenue.  Penny size hail was reported near 55th Street and Clarendon Hills Road.