Sunshine and Warmer on Sunday

High pressure will provide clear skies overnight, but with plenty low level moisture, and light winds there could be some patchy fog tonight that may persist until around 8 am on Sunday morning. With high pressure shifting off to the east,  a southerly wind will develop under mostly sunny skies warming temperatures up into the upper 60's by mid afternoon.  A front will settle into the area on Sunday night bringing some showers, and possibly a thunderstorm, across parts of northern Illinois after midnight.  The front stall out just to the north of the Stateline on Monday, a good southerly wind flow will develop northward from the Gulf of Mexico, and there will be a good chance of showers and thunderstorms through Monday night.  The high on Monday will be around 71 degrees, and it will be very mild overnight on Monday night with a low in the low 60's.  The front will still be very close by on Tuesday, so it will remain mostly cloudy with a slight chance of showers.   There will be scattered showers on Tuesday night, and it will continue to be very mild with a low again in the low 60's.  The front that had been hanging around for a couple of days will pull off to the north across Wisconsin, as a warm front, on Wednesday.  It will be partly sunny and very warm with a high in the middle 70's.  Showers and thunderstorms will develop on Wednesday night in advance of a cold front moving toward the area from the northern plains.  The showers and storms will continue on Thursday as the cold front moves across northern Illinois.  Considerably cooler air will move into the upper mid west late next week with highs on Friday dropping back into the middle 50's, and highs on Saturday only in the upper 40's.