A line of severe thunderstorms moved across northern Illinois during the afternoon hours of August 4th.

Lightning in KANE, ILLINOIS
From 04-AUG-12 14:30:00 to 04-AUG-12 14:30:00 (CST-6)
Location: MOECHERVILLE
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck an apartment complex on the 500 block of Hartford Avenue in North Aurora causing a small fire.

Flash Flood in KENDALL, ILLINOIS
From 04-AUG-12 14:55:00 to 04-AUG-12 17:00:00 (CST-6)
Location: YORKVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One to two feet of water covered parts of Route 126 near Yorkville.

Thunderstorm Wind in OGLE, ILLINOIS
From 04-AUG-12 13:30:00 to 04-AUG-12 13:30:00 (CST-6)
Location: POLO
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Tree limbs 6 to 8 inches in diameter were blown down.

Thunderstorm Wind in OGLE, ILLINOIS
From 04-AUG-12 13:50:00 to 04-AUG-12 13:50:00 (CST-6)
Location: OREGON
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees and power lines were blown down.

Thunderstorm Wind in LA SALLE, ILLINOIS
From 04-AUG-12 13:56:00 to 04-AUG-12 13:56:00 (CST-6)
Location: UTICA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One large tree was blown down.

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 04-AUG-12 14:08:00 to 04-AUG-12 14:08:00 (CST-6)
Location: ROCKFORD
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LA SALLE, ILLINOIS
From 04-AUG-12 14:11:00 to 04-AUG-12 14:11:00 (CST-6)
Location: NORWAY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A large tree was blown down along Route 71 near the small town of Norway.

Thunderstorm Wind in KENDALL, ILLINOIS
From 04-AUG-12 14:15:00 to 04-AUG-12 14:20:00 (CST-6)
Location: NEWARK ARPT
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees were blown down across the southern part of Kendall County.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 04-AUG-12 14:27:00 to 04-AUG-12 14:27:00 (CST-6)
Location: SOUTH WILMINGTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to 70 mph.

Thunderstorm Wind in KENDALL, ILLINOIS
From 04-AUG-12 14:30:00 to 04-AUG-12 14:30:00 (CST-6)
Location: KENTLAND
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large pine trees were snapped along Caton Farm Road between Route 47 and Ashley Road.

Thunderstorm Wind in KANE, ILLINOIS
From 04-AUG-12 14:49:00 to 04-AUG-12 14:49:00 (CST-6)
Location: ELGIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to 60 mph.

Thunderstorm Wind in DU PAGE, ILLINOIS
From 04-AUG-12 14:52:00 to 04-AUG-12 14:52:00 (CST-6)
Location: (DPA)DUPAGE CO ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MCHENRY, ILLINOIS
From 04-AUG-12 14:52:00 to 04-AUG-12 14:52:00 (CST-6)
Location: HUNTLEY
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in WILL, ILLINOIS
From 04-AUG-12 14:56:00 to 04-AUG-12 14:56:00 (CST-6)
Location: MONEE
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several utility poles were blown over, nearly to the ground, but were not snapped, along Harlem Avenue, one mile south of Manhattan-Monee Road.

Lightning in WILL, ILLINOIS
From 04-AUG-12 14:56:00 to 04-AUG-12 14:56:00 (CST-6)
Location: MONEE
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn caught fire due to a lightning strike near Harlem Avenue and Pauling Road.

Hail in COOK, ILLINOIS
From 04-AUG-12 15:00:00 to 04-AUG-12 15:02:00 (CST-6)
Location: PALATINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported near Algonquin and Roselle Roads.

Thunderstorm Wind in COOK, ILLINOIS
From 04-AUG-12 15:05:00 to 04-AUG-12 15:05:00 (CST-6)
Location: SUTTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to 70 mph near the intersection of Algonquin and Barrington Roads.

Thunderstorm Wind in COOK, ILLINOIS
From 04-AUG-12 15:06:00 to 04-AUG-12 15:06:00 (CST-6)
Location: KIMBERLY HGTS
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to 80 mph near the Tinley Park Amphitheatre.

Thunderstorm Wind in COOK, ILLINOIS
From 04-AUG-12 15:20:00 to 04-AUG-12 15:20:00 (CST-6)
Location: (MDW)MIDWAY ARPT CHI
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in COOK, ILLINOIS
From 04-AUG-12 15:29:00 to 04-AUG-12 15:29:00 (CST-6)
Location: DEERING
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Numerous large trees were snapped and uprooted in Lakeview.

Thunderstorm Wind in DE KALB, ILLINOIS
From 04-AUG-12 14:15:00 to 04-AUG-12 14:15:00 (CST-6)
Location: WATERMAN
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WILL, ILLINOIS
From 04-AUG-12 14:48:00 to 04-AUG-12 14:48:00 (CST-6)
Location: NEW LENOX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts were estimated to 60 mph.

Thunderstorm Wind in COOK, ILLINOIS
From 04-AUG-12 15:15:00 to 04-AUG-12 15:15:00 (CST-6)
Location: RICHTON PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Four inch diameter trees were snapped near Interstate 57 and Route 30.  Other debris was reported in the road.

Thunderstorm Wind in KANE, ILLINOIS
From 04-AUG-12 14:31:00 to 04-AUG-12 14:36:00 (CST-6)
Location: AURORA
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated to 70 mph in Aurora.  A 14 inch diameter maple tree was blown down onto a garage.  Part of a roof was ripped off of an apartment complex with water causing damage to 96 units.

Thunderstorm Wind in GRUNDY, ILLINOIS
From 04-AUG-12 14:14:00 to 04-AUG-12 14:15:00 (CST-6)
Location: MORRIS
Magnitude: 60.00 EG
Property damage: 1.50M
Crop damage: 0.00K
Reported by: Emergency Manager

An estimated 40 to 45 trees were blown down in Morris, including some that fell onto houses and cars.  A 26 inch diameter tree fell onto a house on Freemont Avenue.  A 250 foot transmission tower along I-80 collapsed.  A semi-truck parked at a rest stop was toppled.

Thunderstorm Wind in KANE, ILLINOIS
From 04-AUG-12 14:50:00 to 04-AUG-12 14:50:00 (CST-6)
Location: GENEVA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Two injuries occurred when a wind gust estimated to near 60 mph slammed part of a picnic table into two people.  One person was struck in the head and knocked unconscious.  Her injuries required a three-hour brain surgery.  The other person injured was a minor, and no details were released.