Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, snow tracks up the Northeast coast and a potentially crippling winter storm takes aim at the South.

A winter storm dumped snow across the Deep South Tuesday, leaving areas that rarely see this kind of weather with dangerous travel conditions, widespread airport closures and snow days. Here’s what it looked like from Texas across Louisiana,

Snow is falling across vast areas of the Southern U.S. as the region experiences a historic storm that has already killed four people. The snow is falling across Texas, Louisiana, Mississippi, Alabama,