The following events were reported: Flash Flood, Flood, Hail, Lightning, Thunderstorm Wind, Tornado. These occurred near station USW00094846, approximately 20.6276 km away, between 2008-08-04 18:30:00 and 2008-08-05 01:00:00. The events included records with hailstones measuring 49.56605263157895 inches. The flood was caused by Heavy Rain. The events resulted in 2 injuries and 0 fatalities. The events caused property damage valued at 1160000.0 and crop damage of 0.0. Episode Narrative: A powerful line of thunderstorms moved across northern Illinois during the evening hours of August 4th. Widespread and significant wind damage was reported along with several brief tornadoes on the leading edge of this line of storms. Close to 550,000 customers lost power during these thunderstorms. In the City of Chicago, more than 4,400 trees suffered some amount of damage, 161 light poles were damaged and 252 power lines were blown down. A powerful line of thunderstorms moved across northern Illinois during the evening hours of August 4th. Event Narrative: A brief tornado touched down in an industrial area near Fox Court. It continued east northeast across South Gary Drive and dissipated near Stratford Square Mall. A large warehouse had a wall blown out near Fox Court and Madsen Drive. Nickel size hail was reported near Milwaukee Avenue and Inverrary Roads. Nickel size hail was reported across much of Palatine, including at the intersections of Dundee Road and Route 53 and Dundee Road and Route 83. Route 59 at Army Trail Road was closed because of trees that were blown down. Multiple ten inch diameter trees were blown down near Route 47 and Route 64. At least ten trees were blown down, some onto homes. One home lost part of its roof and one person was injured. Tree limbs one foot in diameter were blown down. A house was struck by lightning on Prairie Street, sparking a fire in the kitchen. Damage was limited to the stove, a wall, cabinet and a window. Sheet metal and insulation were torn off a soap factory by strong winds. Most of the damage was cosmetic, no structual damage was reported. Wind gusts were estimated to 70 mph in St. Charles. High winds tore portions off the roof at St. Charles North High School. Roof debris, light poles, tree limbs and a crushed portable toilet littered the school grounds. About ten heating, ventilation and cooling units on the roof were either damaged or blown completely off the roof. Damage was also reported inside the school. A 150 year old oak tree was uprooted near Oxmoor Court. The falling tree broke a skylight on a house. Trees, tree limbs and power lines were blown down across many parts of St. Eight to ten inch diameter trees were blown down on 21st Street, two blocks north of Roosevelt. Trees 10 to 12 inches in diameter were blown down. A 20 inch diameter tree was blown down near Washington Street and Naper Boulevard. Wind gusts were estimated between 60 and 70 mph. Trees and tree limbs were blown down. A tree was blown down on a house on North Major. Trees were blown down. Trees and power lines were blown down. Businesses on the northwest corner of Main Street and Roosevelt Road lost part of their roof and part of a gutter. Trees and power lines were blown down near Jefferson and Marion Roads. Trees and power lines were blown down in the Valley View area. A 100 foot tall maple tree fell onto a house on Prairie Street. The tree broke a window and pulled off parts of a gutter. A wind gust to 70 mph was measured at Aurora High School. Numerous trees, tree limbs and power lines were blown down. A big tree was blown down onto a house on North Mulligan. Quarter size hail was reported near Army Trail and County Farm Roads. A wind gust to 70 mph was measured along Route 31, just north of Mooseheart Road. A 12 inch diameter tree was blown down on 5th Avenue. Numerous trees were blown down on Mannheim Road between Belmont and Addison Roads. Numerous trees and tree limbs were blown down at a horse farm. Two barns sustained roof damage and a pickup truck was heavily damaged but no horses were injured. A barn caught fire on Bliss Road after a power line was blown down. Yard flooding was reported with two inches of rain. A large tree limb fell onto a parked car. Power lines were also blown down. A second, brief tornado touched down in Bloomingdale, near an apartment complex on Century Point Lane. There was roof and window damage at two apartment buildings. Significant damage was done to roofs of houses and to trees from Cardinal Drive east across Bloomingdale Road through Norton Lane and into the area around Sterling Drive. A tree fell onto a house along Army Trail Road. One person was injured. Apartment buildings suffered roof damage. Two houses were damaged by fallen trees and one multi-family house had it's roof completely torn off. Standing water one foot deep was reported in yards. Water was also reported covering some roads. The intersection of Huntley Road and Route 31 was closed due to flooding. Ten to twelve trees on the north side of Wheaton were damaged. Roof damage was reported to a hanger at Dupage Airport on North Avenue.