In the Chicago area the dark green-shaded counties (Chicago south into northwest Indiana) are overlayed with rgey signifying dense fog. The Flood Watch area actually extends from Chicago south into east-central Illinois, much of central and northern Indiana and Lower Michigan Tuesday night and Wednesday with 1 to 3-inch rains falling on frozen soils expected to cause considerable runoff into rivers and streams. Flooding may be further complicated with potentialh ice melt and ice jams due to the tremendous warming going on.
Back to the northwest in North and South Dakota and Minnesota A Winter storm Warning (pink and purple) for heavy 6 to 8-inches of blowing snow tonight into Tuesday and a Wind Chill Watch(lighter green) for wind chills -30 to -50-degrees below zero from later Tuesday night through Friday as the Arctic high pressure air mass descends upon that area. Dangerous wind chills will spread into Minnesota and northern Wiscosnin later Wednesday or Thursday into Friday.
Dense fog advisories tonight for visibilities under a quarter-mile are depicted in grey.
A Freezing rain Advisory for tonight into Tuesday (pink) is in effect for northern Wisconsin and northern Lower Michigan.