Severe weather could snarl holiday travel

Severe weather could snag holiday travel with a strong storm system that's delivering heavy rains in Gulf states and possibly through the East Coast, and threatening snow in the Great Lakes.

Snow from another system fell in some Midwestern states Tuesday, including nearly 2 feet in South Dakota's Black Hills. Wind and blowing snow shut down eastern Colorado's Interstate 70 into Kansas.

Severe thunderstorms with the potential of tornadoes developed in Mississippi, Georgia and Louisiana. Rain was expected through Wednesday in some Mid-Atlantic and New England states. Philadelphia saw some flight delays.

The National Weather Service predicts Christmas Eve snow from Missouri to Michigan. Three inches of snow could fall in Chicago, where O'Hare International Airport expects more than 3 million holiday travelers.