The National Weather Service issued a special weather statement Tuesday that periods of heavy, wet snow are possible on Christmas Eve, which could have a big impact on holiday travel.
A snowstorm could have a drastic effect on flights and put holiday cheer to the test.
Snow will start during the day Wednesday and possibly continue into the evening over portions of northern Illinois or northwest Indiana.
Elsewhere in the country, the National Weather Service warned that 2 to 4 inches of precipitation are expected, with 6 to 8 inches possible, in parts of Alabama, Georgia and north Florida by the time this storm rolls through.
A flash-flood warning was issued for parts of Tallahassee on Tuesday evening, where over 6 inches of rain had fallen.
The Northeast also experienced its share of weather woes on Tuesday. Travelers in Philadelphia were seeing average delays of almost two hours due to low clouds, the Federal Aviation Administration reported. Things weren't much better in Boston's airport and at LaGuardia and Newark Liberty airports in and around New York City.
The West will have its own travel problems, with precipitation forecast to hit the Northwest on Tuesday moving into the Rockies -- in the form of snow -- Christmas Day.
The National Weather Service says snow is likely in Denver; Missoula, Montana; and Jackson, Wyoming. Flight delays are possible in Minneapolis; St. Louis; and Omaha, Nebraska.
Even Hawaii isn't immune, with flash flood watches in effect for all its main islands through Wednesday night due to heavy rains.