The severe storms that killed three people and caused travel delays in the southern U.S. on Tuesday are now headed for the Northeast. 600 fights were canceled across the country on Tuesday, in addition to more than 6,000 delays. As of Wednesday morning, over 370 flights had already been canceled. An outbreak of tornadoes on Christmas Day left damage across the Deep South and over 100,000 customers were left without power in Texas, Arkansas, Oklahoma, Mississippi, Louisiana, and Alabama. But the storms have moved on. The National Weather Service has issued storm and blizzard warnings from Oklahoma and Texas all the way up to Maine.