Forecasters say over half the U.S. population could be affected by snow, ice or bitter cold as a winter storm sweeps across the county.

A massive winter storm is set to batter much of the US with ice, heavy snow and extreme cold, threatening power outages, travel chaos and dangerous wind chills affecting nearly 140 million people.

The storm is expected to sweep through much of the United States, leaving "extremely dangerous" conditions in its wake as it tracks eastwards from the High Plains and Rockies, the National Weather Ser...