Severe weather is expected to bring subzero temperatures the northern Plains as soon as Thursday, then reach the Mississippi Valley, the Northeast and the Ohio Valley by Sunday.

Almost 4,000 flights were canceled in the U.S. on Saturday ahead of a monster winter storm that has already cut power to thousands of utility customers as far west as Texas, and threatened to paralyze...

The anticipated heavy snowfall, ice, and harsh winds threaten to cause power outages in several states, potentially leaving many without heat, while frozen-over roads could cut off driving routes for ...