[Lincoln, Nebraska; December 23. Image via AP.]

A tree is coated with ice as vehicles travel a slick Interstate 80 in Lincoln, Neb., Wednesday, Dec. 23, 2009. A major winter storm is promising to bring a white Christmas to much of the nation's midsection, though countless holiday travelers faced slick roads and scattered flight delays and cancellations Wednesday that only looked to get worse.(AP Photo/Nati Harnik)