National Weather Service United States Department of Commerce

Severe thunderstorms are expected to develop late this afternoon and continue through the evening, ending overnight for areas southeast of Interstate 80. All severe weather hazards are possible along and south of Interstate 80, including the possibility for strong tornadoes. The main threats for areas north of I-80 will be large hail and flooding.
Heads up! The overlap of heavy rain and urban areas may lead to flooding especially across the southern Chicago metro today and tonight.. Do you live in a flood prone area, or often have water entering your basement during heavy rainfall? #ILwx #INwx
Severe thunderstorms are expected to develop late this afternoon and continue through this evening, ending overnight for areas southeast of Interstate 80. Periods of rain will continue Wednesday morning, ending from northwest to southeast. The rain may mix with some light snow as it ends for areas north of Interstate 80. Very windy conditions are expected Thursday night into Friday as a strong cold front moves across the region.