The tropospheric polar vortex is a normal feature that influences weather across the globe every winter, while the ...

There are two of these polar vortexes -- one in the troposphere that affects weather every winter, and one in the ...

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

Long-range computer models suggest a mass of bitterly cold air will arrive in the United States right before Christmas.

A rare weather phenomenon that hasn't occurred since 1968 is expected to plunge temperatures across parts of the United States.

This dramatic-sounding phenomenon is a naturally occurring component of the Earth’s atmosphere that can play a huge role in ...

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.

According to meteorologists and climatologists, critical changes in two major atmospheric patterns—La Nina and the polar ...