Amy Butler

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The polar vortex influences the jet stream, which can bring cold winter weather to the U.S. and Europe. AP Photo/Bill Sikes

What exactly is the polar vortex?

Zachary Lawrence, University of Colorado Boulder and Amy Butler, National Oceanic and Atmospheric Administration

The media often call unusually cold, snowy storms a ‘polar vortex.’ The real polar vortex isn’t coming down to visit the lower 48, but changes to the polar vortex can influence winter weather.

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