Chicago weather: Severe Thunderstorm Watch in effect until 3 AM

May 20, 2013 (CHICAGO) The Severe Thunderstorm Watch is in effect until 3:00 A.M Tuesday for the following counties: Boone, Bureau, Carroll, Cook, De Kalb, Dupage, Ford, Grundy, Henry, Iroquois, Jo Daviess, Kane, Kankakee, Kendall, Lake, La Salle, Lee, Livingston, McHenry, Ogle Putnam, Rock Island, Stephenson, Whiteside, Will and Winnebago.
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