Massive winter storm spawns severe weather threat across Gulf Coast, Tornado Watch issued

While a massive winter storm plunges much of the country into a deep freeze of ice and snow, the same system threatens nearly 10 million people across parts of the Deep South and Gulf Coast with a new hazard — severe thunderstorms.

Fierce winter storm causes 100-car pileup, brings snow as far south as Florida

The pileup in Michigan is the latest impact of the major winter storm moving across the U.S. More than 200 million people are in the path of the arctic blasts.

Live updates: Major storm underway, as snow and ice begin to fall and deep cold sets in

Snow and ice began to accumulate Friday across the Rockies and Plains, and will sweep into the South, Midwest and Appalachians on Saturday.