Scattered thunderstorms developed during the afternoon producing severe hail and damaging winds.  The storms eventually congealed into a line of thunderstorms that produced heavy rain and flooding.

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 11-MAY-14 13:50:00 to 11-MAY-14 13:50:00 (CST-6)
Location: ALWORTH
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Two power poles were blown down near Cunningham and Osborne Roads.

Hail in WINNEBAGO, ILLINOIS
From 11-MAY-14 14:02:00 to 11-MAY-14 14:04:00 (CST-6)
Location: NORTH PARK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported at Rockton Avenue and Glenwood Avenue.

Hail in MCHENRY, ILLINOIS
From 11-MAY-14 16:21:00 to 11-MAY-14 16:23:00 (CST-6)
Location: LAKEMOOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LIVINGSTON, ILLINOIS
From 11-MAY-14 16:23:00 to 11-MAY-14 16:27:00 (CST-6)
Location: EMINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WINNEBAGO, ILLINOIS
From 11-MAY-14 14:15:00 to 11-MAY-14 14:17:00 (CST-6)
Location: LOVES PARK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOONE, ILLINOIS
From 11-MAY-14 14:28:00 to 11-MAY-14 14:30:00 (CST-6)
Location: CALEDONIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in LEE, ILLINOIS
From 11-MAY-14 15:09:00 to 11-MAY-14 15:11:00 (CST-6)
Location: HARMON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 11-MAY-14 15:25:00 to 11-MAY-14 15:27:00 (CST-6)
Location: MARENGO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in KANE, ILLINOIS
From 11-MAY-14 15:38:00 to 11-MAY-14 15:38:00 (CST-6)
Location: SUGAR GROVE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in MCHENRY, ILLINOIS
From 11-MAY-14 15:40:00 to 11-MAY-14 15:44:00 (CST-6)
Location: MARENGO
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 11-MAY-14 15:45:00 to 11-MAY-14 15:48:00 (CST-6)
Location: UNION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, ILLINOIS
From 11-MAY-14 15:51:00 to 11-MAY-14 15:54:00 (CST-6)
Location: FRANKLINVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail was reported near Route 176 and Franklinville Road.

Thunderstorm Wind in LAKE, ILLINOIS
From 11-MAY-14 16:28:00 to 11-MAY-14 16:28:00 (CST-6)
Location: FREMONT CENTER
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in KANKAKEE, ILLINOIS
From 11-MAY-14 16:45:00 to 11-MAY-14 16:45:00 (CST-6)
Location: REDDICK
Magnitude: 52.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Three wooded power poles were blown down near 19522 W 2000 S Road.

Thunderstorm Wind in LA SALLE, ILLINOIS
From 11-MAY-14 17:04:00 to 11-MAY-14 17:04:00 (CST-6)
Location: DAYTON
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in WILL, ILLINOIS
From 11-MAY-14 17:32:00 to 11-MAY-14 17:32:00 (CST-6)
Location: (JOT) JOLIET DISTRIC
Magnitude: 65.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Severe winds tore off portions of the roof at a Best Budget Inn on West Jefferson Street.

Thunderstorm Wind in COOK, ILLINOIS
From 11-MAY-14 17:34:00 to 11-MAY-14 17:34:00 (CST-6)
Location: ALPINE
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in COOK, ILLINOIS
From 11-MAY-14 17:39:00 to 11-MAY-14 17:41:00 (CST-6)
Location: BURNHAM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in FORD, ILLINOIS
From 11-MAY-14 21:05:00 to 11-MAY-14 21:07:00 (CST-6)
Location: GIBSON CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Flood in COOK, ILLINOIS
From 11-MAY-14 19:00:00 to 11-MAY-14 22:00:00 (CST-6)
Location: BERNICE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rains overwhelmed a sewer tunnel causing a hydraulic explosion that blew off a concrete slab and a manhole cover.

Flash Flood in COOK, ILLINOIS
From 11-MAY-14 18:04:00 to 11-MAY-14 22:00:00 (CST-6)
Location: WESTERN SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Interstate 55 was closed between Interstate 294 and Route 171 due to flash flooding.  One of the heavy rain reports in the area includes 1.17 inches of rain that fell in 25 minutes from the co-op observer three miles southwest of Midway Airport.

Flash Flood in KANKAKEE, ILLINOIS
From 11-MAY-14 20:55:00 to 11-MAY-14 22:00:00 (CST-6)
Location: MOMENCE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

On 3000N Road water estimated to around a foot and a half deep was flowing from a field across the road and caused a car to stall.

Flash Flood in FORD, ILLINOIS
From 11-MAY-14 22:30:00 to 11-MAY-14 22:30:00 (CST-6)
Location: GIBSON CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated 1.5 feet of flowing water was reported over Route 47 north of Gibson city with flooding reported on the roads in Gibson City.  A CoCoRaHS observer measured 2.25 inches of rain in Gibson City.