Over the next 10 days, scientists say, changes in the stratosphere will upend weather patterns and set the stage for a cold, snowy December across parts of the Northern Hemisphere.

Thanksgiving is a week away and the weather has the potential to disrupt travel for the tens of millions visiting family and friends.

(CNN) — A nasty coastal storm, known as a nor’easter, is organizing and strengthening off the Southeast US. The storm is poised to deliver tropical storm-force wind gusts, soaking rain and dangerous ...

(CNN) — A marine heat wave spanning much of the North Pacific Ocean is already influencing the weather in North America and is poised to make its mark on winter. The unusually warm ocean water, coined ...