Warm front once again has shifted north into central Wisconsin. There have been a few mid-level clouds developing along the front this morning and it's possible those will slide south into Illinois later this morning and afternoon. The chance for thunderstorm development remains low, however, if clouds do build afternoon highs may struggle to reach 100° and will likely remain in the 90s.
Looking at the upper level pattern the ridge of high pressure is forecast to build across northern Illinois with warmer air moving in aloft. I think this will help some to keep the cloud cover from getting too thick across the area. Heat index values will once again rise past 100°. Just a few more days of the heat before a break later this weekend.
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