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.

Snow and sleet started falling in Texas as officials begin to close schools and airports. Snow and ice could bring major travel disruptions and power outages from Texas to Florida.

Around 40 million people in the U.S. are under a winter storm warning from an unusual blast of severe winter weather.

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.

Meteorologist Devon Lucie starts with the dangerous cold tonight and Monday, then breaks down the snowstorm Tuesday walking you through what the different computer forecasts are showing for timing and precip types,

Today's weather report by meteorologist Geoff Fox highlights a series of significant weather events across the United States. An extreme cold warning has been issued for the Gulf Coast, with wind chills dropping to 10 to 15 degrees,