Chicago weather: Tornado Warning for much of area | LIVE RadarCHICAGO (WLS) -- The Chicago area is under an AccuWeather Alert as more storms with powerful winds are in the forecast Tuesday. There is a Severe Thunderstorm Warning for Grundy, Kendall and LaSalle counties until 11 a.m. There is a Severe Thunderstorm Warning for Jasper, Lake and Porter counties in Indiana until 10:30 am. There is a Severe Thunderstorm Warning for DeKalb County until 10:15 a.m. Most of the Chicago area is under a Level 3 risk for severe weather Tuesday.