The following events were reported: Flash Flood, Flood, Hail, Lightning, Thunderstorm Wind. These occurred near station USW00094846, approximately 27.4912 km away, between 2010-06-23 16:30:00 and 2010-06-23 21:00:00. The events included records with hailstones measuring 55.671578947368424 inches. The flood was caused by Heavy Rain. The events resulted in 1 injuries and 0 fatalities. The events caused property damage valued at 1139500.0 and crop damage of 0.0. Episode Narrative: Severe thunderstorms moved across northern Illinois during the afternoon and evening hours of June 23rd producing widespread wind and tree damage as well as flash flooding. Severe thunderstorms moved across northern Illinois during the afternoon and evening hours of June 23rd producing widespread wind and tree damage as well as flash flooding. Event Narrative:  A gust to 78 mph was measured at the Aurora Municipal Airport. Nickel size hail was reported near mile marker 135 on Interstate 88. A tree was blown down onto a car near Piedmont Circle and Norfolk Court. Lightning struck a house on Manchester Lane causing a fire. The house was uninhabitable. Up to six inches of water was reported on some streets in Itasca. Aurora city crews received 245 calls regarding trees or tree limbs that were blown down in Aurora. A large tree was blown down in front of a house on Fox Mead Court. The tree damaged gutters and siding on the house. Oswego public works estimated 1,000 trees suffered some kind of damage or were completely blown down. A three foot diameter tree was blown down onto a car on South Main Street. The car was not significantly damaged and no one in the car was injured. Numerous trees, tree limbs and power lines were blown down in Elmhurst. Several trees were blown down onto cars causing damage, including a large tree that fell onto a car on Poplar Avenue. Street and basement flooding was reported in Oak Brook and Hinsdale. At least one car was stalled in flood waters at the intersection of The Lane and Oak Street in Hinsdale. Lightning struck a house on South Vista Avenue causing the roof and second floor to catch fire. Three people inside the house escaped without injury. The house was declared uninhabitable. Several streets were flooded in Downers Grove. Rainfall of 1.60 inches was measured in 45 minutes. The fire department assisted a person after his car stalled in high water. A wind gust was measured to 78 mph on Orchard Road, approximately four miles south of Route 30. A semi trailer was flipped over on Interstate 88, just east of Route 83. The driver was taken to the hospital with non life threatening injuries. Three office buildings on Jorie Boulevard sustained roof damage. One of the building's air conditioning units was flung across the parking lot. An Oak Brook fire station near Jorie Boulevard and Kensington Road also sustained roof damage. Trees and tree limbs were also blown down. Numerous roads were flooded and closed in central Cook County. Interstate 55 was closed between Pulaski Road and Damen Avenue. Interstate 290 was closed between Des Plaines and Harlem Avenues. Basement and street flooding was reported city wide in Berwyn where 2.52 inches of rain fell in two hours. Almost every street in Western Springs had standing water with three to four feet of standing water on Hampton and Hillgrove Avenues. Several motorists were rescued from their cars after the cars were submerged in flood waters. A Western Springs fire truck stalled in flood waters and had to be towed. Widespread street and basement flooding was reported in Brookfield, Riverside, North Riverside, Forest Park and LaGrange. Shingles were blown off roofs and trees were blown down near 87th and Washington Streets. Trees were blown down near 87th and Naper Boulevard. Large trees and power lines were blown down south of 75th Street in Naperville. Roof damage was also reported. Numerous trees were blown down near Wisteria Court and two houses were damaged. A street light was blown down on Montgomery Road just east of Farnsworth Avenue. Tree limbs were also blown down. A large tree was blown down blocking 22nd Street. Utility poles and street lights were blown down. A roof was reported blown off a building. One foot of standing water was reported at Park Boulevard and Faywell Boulevard. One foot of standing water was also reported on Lambert Road, north of College of DuPage. A semi truck was blown over on Route 34.