Arctic air originates near the polar regions and is among the coldest air masses on Earth. It typically stays locked in ...

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

A huge winter storm has reignited confusion about the polar vortex, the jet stream and what climate change really means for ...

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across the eastern U.S.

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

Met Office maps show a potential 15 hour window for snow one day next week. Forecasters say Tuesday looks the most likely day ...

Savage blizzards crippling Canada and the US will send a battering-ram jet stream across the Atlantic to ward off the looming ...