Much of central and southeast Illinois will be impacted by a winter storm, which will be tracking northeast across the Ohio Valley overnight. The heaviest snowfall is likely in our southwestern counties...from Rushville to Lincoln/Clinton and south to Jacksonville and Springfield, where 5 to 6 inches is likely. Some locally higher amounts are possible, especially near the Illinois River. Farther north and east, a winter weather advisory will be in affect for 2 to 5 inches of snow. In the southeast areas, a rain/snow mixture along I-70 this evening will diminish snow totals in that area. The rain/snow will transition to all snow after midnight, with snowfall generally in the 2 to 3 inch range.
Forecast snow amounts for central and southeast Illinois are shown in the graphic below. The snow will be wet and heavy.
Across southeast Illinois, the main concern will be with heavy rain. Rainfall totals of 1 to 1.25 inches or more are expected. This heavy rainfall will cause further rises on the Little Wabash, Embarras, and mainsteam Wabash Rivers, some portions of which are already in flood. Travelers in this area should be alert for standing water on roadways, which can be difficult to see at night. Do not drive through areas that may be flooded.