Cloudiness could be a little more extensive across the area Wednesday and thus temps will find it more difficult to reach the 90 degree mark. Tuesday’s highs were 92 at both O’Hare and Midway and we even hit the 90 degree mark at the lakefront. This marked the 3rd 90 this year at Chicago’s official O’Hare site while Midway has doubled that total. Heat indexes Tuesday exceeded the 100 degree mark at many locations – topped by a heat index of 109 degrees at Countryside.

Right now July 4th looks like there will be a good chance of afternoon and evening thunderstorms along with light southerly winds and very warm and humid conditions. Friday things should change as a cold front is expected to sweep south out of Wisconsin, triggering another round of thunderstorms as it ripples across our area.