Winter Storms and Dangerous Cold Bring Weather Warnings Across U.S.

More than 160 million people were under winter weather warnings or advisories Sunday as a hazardous mix of Arctic cold and wind, along with snow and sleet, pummeled much of the country. 

A cold front spilling out of Canada is responsible for dangerously cold temperatures from the Pacific Northwest all the way east to the Rust Belt, the National Weather Service said.