Two lines of storms with winds expected to reach 60 mph swept into the Chicago area Tuesday night and will continue into the morning hours.
Lightning, heavy rain and isolated flash flooding were expected overnight.
Thunderstorm watches and warnings were issued throughout the Chicago area and northwest Indiana until around 10 p.m.
Fast-moving system that swept across several locations in the Chicago area is expected to move out by the late-morning and hours, making way for a partly cloudy, hot and humid day ahead.
As temperatures rise into the upper-80s and low-90s, with heat indices near 100 degrees, the chance for another round of storms looms.
By the late-afternoon and early evening hours, more showers and storms are likely, some of which could become strong to severe.
The storms bring with them the chance for damaging winds of up 60 mph, large hail, heavy rain and frequent lightning. The threat for a tornado is low, but still present.
The storms will continue through the night but are expected to weaken in intensity overnight.
A few showers and storms are possible again Wednesday morning, mainly south of the city and into northwest Indiana.
The remainder of the week looks to stay mostly dry, with the next chance for storms set for Friday evening and again Saturday.