A line of severe thunderstorms that swept across the Chicago region from late Saturday into early Sunday knocked out electricity to more than 60,000 Commonwealth Edison customers, flooded roadways and damaged dozens of structures. ComEd said outages peaked near 65,000 and it aimed to restore 80 percent of service by Sunday night, with full restoration expected by early Monday afternoon. The storms produced torrential rain and frequent lightning, triggering flash-flood warnings and leaving streets under several feet of water in Cicero and Oswego, while a car was stranded near Interstate 80 in Joliet. Emergency crews in the Cary Fire Protection District responded to nearly 100 storm-related incidents; officials said no injuries were reported. In Mount Prospect, fire officials believe a microburst with wind gusts around 60 mph ripped the roof from a four-story apartment building near Route 83 and Dempster Street, affecting about 60 units and displacing residents. The American Red Cross opened a temporary shelter and said it had to replace medications for several occupants who were unable to re-enter the building. The National Weather Service warned that scattered thunderstorms could redevelop through Monday, while dangerous swimming conditions will persist along southern Lake Michigan beaches. Forecasters expect a shift to cooler, less humid weather by the middle of the week.