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

WASHINGTON (AP) — Warm Arctic waters and cold continental land are combining to stretch the dreaded polar vortex in a way that will send much of the United States a devastating dose of winter weather ...

CHICAGO — A year after a brutally cold spell was blamed on something called the polar vortex — which was treated like a northern invasion by the media and as a conquering hero by children impressed by ...