During the late afternoon and early evening, multiple storms produced large hail and very heavy rainfall along the I-80 corridor, including across the far southern and southwestern Chicago metro area.  The largest hail reported was measured at 4.75 two miles north-northwest of Minooka around 7:20 pm.  There were many reports of 2.5 diameter hail and larger across Minooka from Emergency Management, law enforcement, and the public.  There were multiple reports of vehicle damage from this area.  The 4.75 diameter hail observed was the largest documented hail stone in Illinois since 1961.

Hail in WILL, ILLINOIS
From 10-JUN-15 17:18:00 to 10-JUN-15 17:18:00 (CST-6)
Location: ROMEOVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in WILL, ILLINOIS
From 10-JUN-15 17:23:00 to 10-JUN-15 17:23:00 (CST-6)
Location: SOUTH LOCKPORT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in WILL, ILLINOIS
From 10-JUN-15 17:35:00 to 10-JUN-15 17:35:00 (CST-6)
Location: LIDICE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILL, ILLINOIS
From 10-JUN-15 17:45:00 to 10-JUN-15 17:45:00 (CST-6)
Location: PLAINFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in WILL, ILLINOIS
From 10-JUN-15 17:45:00 to 10-JUN-15 17:45:00 (CST-6)
Location: LOCKPORT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in GRUNDY, ILLINOIS
From 10-JUN-15 18:16:00 to 10-JUN-15 18:16:00 (CST-6)
Location: MINOOKA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WILL, ILLINOIS
From 10-JUN-15 18:33:00 to 10-JUN-15 18:52:00 (CST-6)
Location: CHANNAHON
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous reports of hail came in from Channahon.  Nickel size hail was reported as early as 7:22 PM CDT with the first severe report of hail arriving at 7:33 PM CDT.  The largest hail stones were up to 1.75 inches.  Damage to cars was reported by the emergency manager.

Hail in WILL, ILLINOIS
From 10-JUN-15 18:26:00 to 10-JUN-15 18:26:00 (CST-6)
Location: SHOREWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILL, ILLINOIS
From 10-JUN-15 17:47:00 to 10-JUN-15 17:48:00 (CST-6)
Location: (LOT) LEWIS UNIVERSITY AIRPORT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Nickel to quarter size hail was measured at the NWS Chicago office in Romeoville while ping pong ball size hail was reported about two miles west of the office.

Flood in WILL, ILLINOIS
From 10-JUN-15 18:05:00 to 10-JUN-15 21:00:00 (CST-6)
Location: JOLIET
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A foot to a foot and a half of standing water was reported on portions of Western Avenue.

Hail in KENDALL, ILLINOIS
From 10-JUN-15 18:20:00 to 10-JUN-15 18:20:00 (CST-6)
Location: MINOOKA
Magnitude: 4.75 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Social Media

A photo was sent to NWS Chicago showing hail up to 4.75 inches in diameter near the intersection of Camden Drive and Kettleson Drive.  Multiple vehicles were damaged including shattered windshields.

Hail in GRUNDY, ILLINOIS
From 10-JUN-15 18:23:00 to 10-JUN-15 18:50:00 (CST-6)
Location: MINOOKA
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager