Frost and freezing temperatures are expected at sunrise across the Chicago area. Temperatures could range from the upper 20s west of the Fox River Valley to the mid-30s in the city.
An upper air disturbance will pass to our south during the day, spreading cloudiness over our area with a chance of showers mainly south of Interstate 80. Temperatures as a result will have difficulty rebounding, with afternoon highs struggling to get much warmer than the mid-40s.
The disturbance will move quickly off to the east overnight, skies will clear and low temperatures could be right back near the freezing mark sunrise Saturday.
By Friday morning, Michael will be considered a post-tropical storm moving off the Virginia coast into the Atlantic, where it is expected to reintensify with winds reaching 70 mph as it races out to sea and across the North Atlantic.