A cold front moved into northern Illinois during the afternoon hours producing severe thunderstorms which moved slowly and produced very heavy rain and flash flooding.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 09-JUL-07 14:25:00 to 09-JUL-07 14:25:00 (CST-6)
Location: HUNTLEY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was blown down on a car at Route 20 and Harmony Road.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 09-JUL-07 14:45:00 to 09-JUL-07 14:45:00 (CST-6)
Location: HUNTLEY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Large tree limbs blown down at Route 20 and Church Road.

Thunderstorm Wind in KANE, ILLINOIS
From 09-JUL-07 15:00:00 to 09-JUL-07 15:00:00 (CST-6)
Location: HAMPSHIRE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Six to Eight inch diameter tree limbs blown down at Warner and Jefferson Roads.

Thunderstorm Wind in COOK, ILLINOIS
From 09-JUL-07 15:03:00 to 09-JUL-07 15:03:00 (CST-6)
Location: ARLINGTON HGTS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree blown down in backyard of a house.

Thunderstorm Wind in DE KALB, ILLINOIS
From 09-JUL-07 15:58:00 to 09-JUL-07 15:58:00 (CST-6)
Location: DE KALB
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was blown down on the north side of Greenbrier Road.

Thunderstorm Wind in DE KALB, ILLINOIS
From 09-JUL-07 16:00:00 to 09-JUL-07 16:00:00 (CST-6)
Location: DE KALB
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was blown down near Lowden Hall on the Northern Illinois University Campus.

Thunderstorm Wind in KANE, ILLINOIS
From 09-JUL-07 14:48:00 to 09-JUL-07 14:48:00 (CST-6)
Location: ALGONQUIN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Lightning in MCHENRY, ILLINOIS
From 09-JUL-07 15:00:00 to 09-JUL-07 15:00:00 (CST-6)
Location: MARENGO
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a two-story house starting a fire which caused signficant damage.

Flood in MCHENRY, ILLINOIS
From 09-JUL-07 15:00:00 to 09-JUL-07 18:00:00 (CST-6)
Location: CRYSTAL LAKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Over a foot of water covered the intersection of Keith Avenue, Devonshire Lane and Route 14.

Hail in DE KALB, ILLINOIS
From 09-JUL-07 14:48:00 to 09-JUL-07 14:50:00 (CST-6)
Location: DE KALB
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in WILL, ILLINOIS
From 09-JUL-07 15:05:00 to 09-JUL-07 15:07:00 (CST-6)
Location: ROMEOVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail reported at Veterans Parkway and Rogers Road.

Hail in WILL, ILLINOIS
From 09-JUL-07 16:14:00 to 09-JUL-07 16:16:00 (CST-6)
Location: PLAINFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nickel size hail reported at Caton Farm Road and Wemere Park.

Hail in COOK, ILLINOIS
From 09-JUL-07 15:24:00 to 09-JUL-07 15:26:00 (CST-6)
Location: LEMONT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILL, ILLINOIS
From 09-JUL-07 15:44:00 to 09-JUL-07 15:46:00 (CST-6)
Location: PLAINFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail reported at 135th Street and Plainfield/Naperville Road.

Lightning in MCHENRY, ILLINOIS
From 09-JUL-07 15:15:00 to 09-JUL-07 15:15:00 (CST-6)
Location: LAKE IN THE HILLS
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a house causing a fire in the attic, which sustained extensive damage.  The rest of the house was uninhabitable.

Flash Flood in DE KALB, ILLINOIS
From 09-JUL-07 15:51:00 to 09-JUL-07 19:00:00 (CST-6)
Location: DE KALB
Flood cause: Heavy Rain
Property damage: 750.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Torrential rainfall led to flash flooding in parts of DeKalb.  Numerous roads were closed with four feet of standing water.  Several people had to be rescued from cars in high water.  Numerous basements were flooded and a retail store on Sycamore Street was flooded.  A dorm on the Northern Illinois University Campus was evacuated.  Rainfall amounts ranged from 3 to 5 inches across DeKalb.  The highest amount was 5.00 inches at 13th and Scyamore Street, before the gage overflowed.

Thunderstorm Wind in DE KALB, ILLINOIS
From 09-JUL-07 15:22:00 to 09-JUL-07 15:22:00 (CST-6)
Location: DE KALB
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer