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The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. It ALWAYS exists near the poles, but weakens in summer and strengthens in winter. The term "vortex" refers to the counter-clockwise flow of air that helps keep the colder air near the Poles.

A polar vortex is an upper level low-pressure area lying near the Earth's poles. There are two polar vortices in the Earth's atmosphere, overlying the North and South Poles.

The polar vortex, the roaring river of air winding around the North Pole, holds the cards. What they reveal could be very disturbing and a harbinger of extreme winter weather in the Eastern United ...

A polar vortex is a large pocket of very cold air, typically the coldest air in the Northern Hemisphere, which sits over the polar region during the winter season.

The polar vortex has fractured, and the eastern U.S. faces a punishing stretch of winter weather. Forecasts call for a very cold and stormy pattern, just underway, to peak in a few weeks.

The polar vortex is making big changes for the new year. Around January 1, this whirling blob of cold air, which sits 10 to 30 miles above the surface of the North Pole, broke apart into at least ...

The polar vortex is a whirling cone of low pressure over the poles that's strongest in the winter months due to the increased temperature contrast between the polar regions and the mid-latitudes ...

In this year's case, the weakening of the polar vortex in early January was caused by a sudden stratospheric warming (SSW) that then spurred the vortex "to split into three distinct circulation ...

The breaking off of part of the vortex is what defines a polar vortex event. But it actually occurs when the vortex is weaker, not stronger. That might sound weird—but it actually makes sense.

The Polar Vortex >> Everything you need to know: The polar vortex | Earth | EarthSky

The Polar Vortex >> Everything you need to know: The polar vortex | Earth | EarthSky

The Polar Vortex >> The science behind the polar vortex | National Oceanic and Atmospheric Administration

The Polar Vortex >> The science behind the polar vortex | National Oceanic and Atmospheric Administration

The Polar Vortex >> Images of frozen Chicago reveal devastating effect of polar vortex's -62F temp | Daily Mail Online

The Polar Vortex >> Images of frozen Chicago reveal devastating effect of polar vortex's -62F temp | Daily Mail Online

The Polar Vortex >> Why giant snowballs in Siberia are bad news for Americans - Green - News - Catholic Online

The Polar Vortex >> Why giant snowballs in Siberia are bad news for Americans - Green - News - Catholic Online

The Polar Vortex >> Polar Vortices On Venus - YouTube

The Polar Vortex >> Polar Vortices On Venus - YouTube

The Polar Vortex >> The big thaw begins: FROZEN BODIES found in snow as temperatures begin to rise after brutal ...

The Polar Vortex >> The big thaw begins: FROZEN BODIES found in snow as temperatures begin to rise after brutal ...

The Polar Vortex >> Frosty Lighthouse | The lighthouse in St. Joseph, Michigan, … | Flickr

The Polar Vortex >> Frosty Lighthouse | The lighthouse in St. Joseph, Michigan, … | Flickr

The Polar Vortex >> Global Warming At The Pole Since 1913 | Watts Up With That?

The Polar Vortex >> Global Warming At The Pole Since 1913 | Watts Up With That?

The Polar Vortex >> Ea O Ka Aina: The Instability Express

The Polar Vortex >> Ea O Ka Aina: The Instability Express