(2:45PM - 12/31/18) A storm system that is currently moving through the region and bringing widespread rainfall to the state, will end as accumulating snow for portions of Northern Illinois.
Widespread rains have been ongoing across the state from last night into this afternoon, with heavy rainfall totals of 2-5" and minor flooding having occurred across portions of Central and Southern Illinois.
As the storm system pushes northeast of the state later today, colder air will wrap in, allowing lingering precipitation across portions of Northern Illinois to change to snow. A period of all snow will be possible across portions of Northern Illinois this evening into early Tuesday morning. Accumulations will be lower end, with max amounts of 1-3" being possible for some areas. The main period of snow will end early Tuesday morning, though few isolated to scattered snow showers will be possible across portions of Northern and Central Illinois Tuesday.