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The National Weather Service in Chicago has issued a * Flash Flood Warning for... Will County in northeastern Illinois... Northern Kankakee County Southeastern DuPage County Southeastern Cook County Porter County in NW Indiana... Lake County in NW Indiana... ..Dark red-shaded area on the headlined map... * Until 145 AM CDT Saturday. * At 743 PM CDT, Doppler radar was tracking multiple waves of heavy thunderstorms moving across the area. Rainfall rates of 1-2 inches per hour are likely, with isolated heavier rates possible. Flash flooding may begin shortly. * Some locations that will experience flooding include... Chicago, Joliet, Hammond, Gary, Bolingbrook, Orland Park, Tinley Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Portage, Merrillville, Valparaiso, Chicago Heights, East Chicago, Schererville, Hobart, Lansing and Crown Point.