India, June 11 -- Chicago residents faced a volatile weather day on Thursday as a line of thunderstorms moved across northern Illinois. The developing weather system has already prompted a Flood Watch covering dozens of counties and led to flight disruptions at Chicago's O'Hare International Airport

According to the National Weather Service, flash flooding caused by excessive rainfall is possible across portions of northern Illinois. Authorities have issued a flood watch for large parts of the Chicago metropolitan area till Jun 11, 11:00 pm CDT.

Areas under the Flood Watch include Boone, DeKalb, DuPage, Kane, Kendall, Kankakee, Lake, Lee, La Salle, McHenry, Ogle, Winnebago, Cook, Grundy and Will counties, among others. The alert covers ...