Chicago weather from the Chicago Tribune. Including Tom Skilling 7 day local weather forecast. WGN-TV and the Chicago Tribune — chicagotribune.com Weather Severe Thunderstorm Watch in IL: Cook , DeKalb , DuPage , Grundy , Kane , Kankakee , Kendall , Lee , Ogle , Will , Winnebago Severe Thunderstorm Warning in IL: Cook , DuPage , Will Flood Warning in IL: Henry , Jo Daviess , Kane , Lake , McHenry , Mercer , Ogle , Rock Island , Stephenson , Whiteside , Winnebago Flash Flood Watch in IL: Mercer , Rock Island A few moments ago lightning struck…