Thursday turned out to be a beautiful day with temperatures warming into the low 70s area wide. The day started off with a bit of fog, but the sun was quick to return by mid-morning. The heating of the day allowed clouds to build, leading to partly cloudy skies for a time during the afternoon.
A weak upper-level disturbance moving across the Great Lakes and Midwest produced a few showers to our north in Wisconsin, but very little across northern Illinois. And as we get further into the evening the chance for any precipitation continues to dwindle. As the sun sets, we will begin to lose some of the cloud cover which will lead to a relatively quiet night. Overnight lows will dip into the low 50s, with a few spots possibly falling into the upper 40s once again.
Friday will begin with plenty of sunshine but similar to Thursday, clouds will begin to bubble up during the late morning and afternoon. A warming air mass aloft will bring temperatures during the afternoon close to 80 degrees. But a cold front moving in from the north along with strengthening winds in the jet stream will help produce isolated to widely scattered thunderstorms, first in Wisconsin, during the afternoon before sinking down into parts of northern and northeast Illinois late afternoon and evening.
The Storm Prediction Center has highlighted parts of the viewing area within a 'marginal' risk for isolated severe storms Friday afternoon and evening. This isn't going to be a widespread storm event, but with just enough instability building up during the afternoon a strong to severe storm remains possible. If storms do reach severe limits wind and hail would be the biggest threats. The window for storms will be from roughly 3pm/4pm through 10pm. The incoming cold front will pass to our west Saturday and should settle around the Mississippi River during the afternoon, keeping the rain threat to our west.
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