The National Weather has issued a Dense Fog Advisory for Champaign, DeWitt, McLean, Piatt and Vermilion counties until 4am Tuesday morning and for Ford and Iroquois Counties until 6am Tuesday morning. Visibility will be one quarter of a mile or less, with some areas seeing visibility dropping to near zero.
Dense fog will make driving challenging throught the night. Motorists should be prepared for rapidly changing visibilities when traveling from areas of relatively lighter fog into areas of very dense fog. Allow for extra time to reach your destination.
The National Weather Service has also issued a flood watch for East Central Illinois, starting Tuesday afternoon and going through late Tuesday evening. Counties under the watch include Champaign, Vermilion, Douglas, Edgar, Coles, Moultrie, Shelby, Piatt, Macon, DeWitt, and McLean.
Forecasters say two inches of rain is possible, and that could lead to flooding of some rivers and streams. So if you're driving and come upon a flooded roadway, you should turn around and find another route. You should also bring any items inside that could get washed away.