Debris litters the courtyard behind the Constitution House Apartments on Aurora's west side after a portion of its roof was torn off during a violent thunderstorm on Saturday, August 4, 2012. | Jeff Cagle~For Sun-Times Media

After a severe storm, a tree came down on Prairie Street in Aurora on Saturday, Aug. 4, 2012. | Mark Foust ~ Sun-Times Media

With her uncle's generator supplying electricity for light and fans after the power went out, Hannah Winters of Algonquin gets her steer 'Spike' ready for auction after a severe thunderstorm hit the Kendall County Fair in Yorkville on Saturday, August 4, 2012. | Steven Buyansky~Sun-Times Media

Fair directors Tara Bernard and Jeff Anderson roll up the side of the vendors tent after a severe thunderstorm hit the Kendall County Fair in Yorkville on Saturday, August 4, 2012. | Steven Buyansky~Sun-Times Media

Food vendors clean up Saturday after a strong thunderstorm blew through the North Aurora Days festival in Clock Tower Plaza. Mary Beth Nolan~For Sun-Times Media

Storm clouds linger over North Aurora Days Festival Saturday at Clock Tower Plaza in North Aurora. Strong winds toppled food tents and caused damage to the beer tent Mary Beth Nolan~For Sun-Times Media

Debris litters the courtyard behind the Constitution House Apartments on Aurora's west side after a portion of its roof was torn off during a violent thunderstorm on Saturday, August 4, 2012. | Jeff Cagle~For Sun-Times Media

Roofing material hangs over a ledge at the Constitution House Apartments on Aurora's west side on Saturday, August, 4, 2012, after a violent thunderstorm tore away part of the building's roof. | Jeff Cagle~For Sun-Times Media

Residents survey damage as a fallen tree limb blocks Glenwood Place on Aurora's west side following a violent thunderstorm on Saturday, August 4, 2012. | Jeff Cagle~For Sun-Times Media

An Aurora police officer blocks traffic on New York Street due to fallen power lines across the road following a violent thunderstorm on Saturday, August 4, 2012. Limbs came down across the city knocking out power to many. | Jeff Cagle~For Sun-Times Media

Power lines lie scattered with broken pieces of a large tree limb that fell in the street in the 100 block of North Chestnut Street during a violent thunderstorm on Saturday, August 4, 2012. | Jeff Cagle~For Sun-Times Media

There was tree damage on Gleason Avenue on the west side of Aurora after a severe storm blew through the area on Saturday, Aug. 4, 2012. | Mark Foust ~ Sun-Times Media

A tree limb came down on a fence at the Orchard Valley Golf Course on the west side of Aurora during a severe storm on Saturday, Aug. 4, 2012. | Maureen Price ~ Sun-Times Media