Behind the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar vortex ...

The west half of the country, including the Midwest, will start to warm up. But that won't be the case for the East Coast.

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

Add Yahoo as a preferred source to see more of our stories on Google. Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...