(CNN) — 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 ...

(CNN) — A powerful winter storm swept across the central and eastern United States, knocking out power and snarling travel during one of the busiest stretches of the holiday season. The wide-ranging ...

(CNN) — A major winter storm is spreading heavy snow and damaging ice across a large portion of the United States. Extremely cold temperatures will only worsen the storm and increase its danger. The ...

(CNN) — A blast of Arctic cold air is set to sweep across the country just as family and friends take to the roads and skies to gather for Thanksgiving. Parts of the Rockies and Plains are already ...

(CNN) — A rapidly strengthening coastal storm is expected to develop this weekend and bring heavy snow, strong winds and coastal flooding to the Southeast amid an outbreak of deadly cold temperatures.

(CNN) — A final round of heavy rain is drenching California Friday and threatening to bring more flooding and debris flows after a days-long deadly siege of storms. The waves of storms have killed at ...

(CNN) — Much of the United States is experiencing prolonged and extreme cold weather, with recent winter storms, dangerous windchills and record low temperatures affecting millions of people. As ...