Scattered thunderstorms produced heavy rain and severe winds across northeastern Illinois during the early evening hours.  Additional thunderstorms developed overnight producing heavy rain that resulted in flooding.  Several locations reported storm total rains of over four inches, including 4.53 inches by the co-op observer near Midway Airport.  Much of this precipitation fell within a short time period.  During the storm, the co-op observer near Midway measured several times reporting 1.80 inches at 17 minutes, 2.75 inches at 27 minutes, and 3.60 inches at the 40 minute mark.

Flash Flood in COOK, ILLINOIS
From 22-AUG-14 01:40:00 to 22-AUG-14 07:30:00 (CST-6)
Location: JUSTICE
Flood cause: Heavy Rain
Property damage: 50.00M
Crop damage: 0.00K
Reported by: Public

Major flooding impacted portions of the souhtwest suburbs of Chicago.
Numerous streets were flooded and impassable with several feet of water in Burbank and Oak Lawn.  Numerous cars stalled in the flooded streets and many basements were inundated with water.  Multiple lanes and the shoulder was flooded and closed on I-294 at Route 171.  Over three feet of water was reported in the viaduct at Kedzie Avenue and 79th Street where a fire truck stalled trying to pass through.

Thunderstorm Wind in WILL, ILLINOIS
From 21-AUG-14 16:39:00 to 21-AUG-14 16:41:00 (CST-6)
Location: PEOTONE
Magnitude: 58.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous branches larger than eight inches in diameter were blown down within a couple block radius in Peotone.  A tent was blown down and there was some damage to a couple rides at the Will County Fair.  A car was crushed by a downed tree on Louise Street.  Tree limbs and power lines were blown down on the west side of Rathje Road.  A tree around a foot in diameter snapped to the south of Conner Shaw School.

Flash Flood in COOK, ILLINOIS
From 22-AUG-14 02:05:00 to 22-AUG-14 07:30:00 (CST-6)
Location: COLEHOUR
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Viaducts at 95th Street and Dorchester Avenue as well as 93rd Street and Commercial Avenue were flooded with stranded cars.

Lightning in LIVINGSTON, ILLINOIS
From 22-AUG-14 03:00:00 to 22-AUG-14 03:00:00 (CST-6)
Location: PONTIAC
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

Lightning struck a utility pole which caught fire.

Flash Flood in DU PAGE, ILLINOIS
From 22-AUG-14 03:23:00 to 22-AUG-14 07:30:00 (CST-6)
Location: NORTH LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Eastbound I-290 at Emroy Avenue was flooded and closed.

Flood in LIVINGSTON, ILLINOIS
From 22-AUG-14 04:02:00 to 22-AUG-14 10:00:00 (CST-6)
Location: DWIGHT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Street flooding up to two feet deep was reported in Dwight.

Flash Flood in COOK, ILLINOIS
From 22-AUG-14 03:23:00 to 22-AUG-14 07:30:00 (CST-6)
Location: MAYWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several lanes on westbound I-290 at Des Plaines Avenue were flooded and impassable.

Flash Flood in DU PAGE, ILLINOIS
From 22-AUG-14 03:00:00 to 22-AUG-14 07:30:00 (CST-6)
Location: WOOD DALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two out of three lanes on Route 83 were flooded and impassable on Route 83 at Bryn Mawr Avenue.  A CoCoRaHS observer near Elk Grove Village measured 3.69 inches of rain.