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.

The winter most are familiar with: The date on your calendar when winter begins is known as the winter solstice. In 2025, that will occur on Saturday, Dec. 21, at 10:03 a.m. ET.

A disturbance in the polar vortex could spill icy cold air south into the United States much earlier than usual, the National ...

La Niña persists with cooling Pacific temperatures and rising likelihood of development, impacting global weather patterns, ...

Most states are expecting above-average precipitation, with temperatures varying across the U.S. during the busy travel week.

La Niña is favored to continue into the winter, with a 61% chance of transitioning to near normal conditions most likely in ...

The phenomenon, known as a sudden stratospheric warming, it's "the largest type of disruption that occurs to the polar vortex ...

Another Arctic blast is on the move toward the U.S., bringing the potential for bitter cold and heavy snow accumulations to Indiana.

Another Arctic blast is on the move toward the U.S., bringing the potential for bitter cold and heavy snow accumulations to Michigan.

Sudden stratospheric warming occurs when temperatures - typically miles above Earth’s surface - rise dramatically over a ...