It's looking like there's certainly some spinning that will be happening in the atmosphere in the Chicagoland area, as well as a lot of energy available to any storms.
However, it's seeming to be that models are conflicting on whether storms will enter the Chicagoland area. The Rapid Refresh model has indicated for at least the last 6 model runs that storms will arrive in that area between 7-10 PM CDT.
A few other sources either don't introduce storms to the area or do so at a very late hour ( 1 AM).
At this time, I would rather introduce a chance of thunderstorms for the area tonight. We will see what happens.