Over 75% of the US expected to face freezing temperatures this week as rare winter storm barrels toward the South

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.

​ 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. Read More Breaking News, Latest News and Videos | CNN