A major winter storm is expected to be the biggest in years as cold air moves in from the Arctic bringing snow and frigid temperatures across 20 Southern States.

Winter Storm Cora is sweeping through the Southeast and Ohio Valley, delivering a mess of snow and some ice from Tennessee to the Carolinas and Virginia, including Charlotte and Raleigh. The wintry mess is snarling travel and in some cases icing could be heavy enough to cause power outages and tree damage.