The clock includes 16 counties in Illinois, including eight in NBC 5. The counties of McHenry, DeKalb, Kane, DuPage, LaSalle, Kendall, Grundy, Will and Kankakee are all on the clock, which will run until 8 p.m. . According to the National Weather Service, strong thunderstorms are possible across Illinois and northwest Indiana on Saturday afternoon and into the evening. Some of these storms could potentially cause harmful straight winds, hail, heavy rain, and even isolated tornadoes. Stay tuned to NBC 5 for all the latest details on this growing story.