A semi driver was killed in Valparaiso as strong winds moved through the area, knocking out power for thousands, officials said. The storms uprooted trees, downed power lines, and damaged several homes,

The Storm Prediction Center has areas southeast of I-55 in an "Enhanced Risk," this is a level 3 of 5 on their severe risk scale. Locations near and along I-55 are in a "Slight Risk" (level 2 of 5), and then north and northwest portions of Chicagoland are in a "Marginal Risk" (level 1/5).

Officials said there was a 60% chance of showers and a thunderstorm  possible by 2 p.m. Wednesday in portions of north central and northeast Illinois and northwest Indiana.

The Chicago branch of the National Weather Service tweeted out: "The potential for severe weather returns as early as Tuesday night (threat level 1 and 2 of 5) as multiple waves of storms life across the area, mainly after midnight. Large hail, gusty winds and lightning are the main hazards of the storm."

Severe thunderstorms, including tornado warnings, affecting Chicago and surrounding areas caused flights to be held at O'Hare

A line of severe storms triggered tornado warnings for parts of the area late Wednesday, and brought dangerous wind, hail and blinding downpours to the entire Chicago area. The severe storms had ...

Severe weather including storms, flooding and possible tornadoes brought weather warnings and damage across parts of the South and Midwest Sunday.

Weather balloon releases — tracking temperature, pressure and wind speed — have been suspended or reduced in the Midwest and Great Plains.