The start of the week will be nice and dry with temperatures warming into the mid and upper 70's Monday and Tuesday. By Wednesday an area of low pressure moves in from the Pacific Northwest bringing with it rain and embedded thunderstorms Wednesday morning and afternoon. Some of the storms Wednesday afternoon and evening could be strong, but depends on how much moisture is pulled into northern Illinois and southern Wisconsin.
The pattern will turn a little more active, however, for the upcoming weekend. A cold front will pass Wednesday night and then be pulled back north as a warm front Thursday and Friday. As it does it becomes parallel with the winds in the mid and upper levels of the atmosphere, causing it to stall very close to the Stateline. But where exactly the front stalls is a little difficult to pinpoint at this point. North of the stationary boundary temperatures will be in the 50's and 60's with plenty of cloud cover, rain showers and embedded thunderstorms. South of the boundary temperatures will warm into the 70's and 80's with a chance for strong, to even severe, thunderstorms.
Not only will there be a storm threat but also a heavy rain threat as quite a bit of moisture will be pulled northward from the Gulf of Mexico. With repeated rounds of rainfall possible for the weekend, rain totals up over one inch could occur, especially for locations right along the stalled frontal boundary. Flooding could become a concern, but it all depends on where the boundary ends up.
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