U.S. holiday travel seen difficult as storm hits

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An automobile sits upside down in the car lot of Mercedes-Benz of Mobile following a winter storm in Mobile, Alabama, December 20, 2012. The first major winter storm of the year took aim at the U.S. Midwest on Thursday, triggering high wind and blizzard warnings across a widespread area, and a threat of tornadoes in Gulf Coast states to the south. REUTERS/Jon Hauge