High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

Cold and snowy weather has gripped much of the northern tier of the United States since Thanksgiving, but a pattern change will torch the chance of white Christmas for many.

• A busy travel day: This year’s Thanksgiving travel period is expected to be the busiest in 15 years, according to the Federal Aviation Administration. About 73 million are projected to hit the road, ...

Thanksgiving is a week away and more than 80 million Americans are planning to travel at least 50 miles from home. But the weather has the potential to disrupt their visits with family and friends.