As millions travel for the holidays, severe weather including tornadoes, damaging winds, and heavy rains are predicted across the South, affecting Texas, Louisiana, Mississippi, and Alabama. The National Weather Service has issued tornado watches and warnings as the risk of severe storms rises. An estimated 17 million people are under threat, with potential EF3 tornadoes and flash floods expected. Airports are experiencing thousands of delays and cancellations. The storm is set to impact travel routes into several major cities, with risks continuing into the Southeast on Sunday.