Time lapse: Polar Vortex system moves in over Lake Michigan

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Data pix.

The system that's impacting the U.S. right now is being called a "polar vortex."

This new video shows the system moving over Lake Michigan.

The polar vortex is circulation of strong, upper-level winds that normally surround the North Pole.

When the vortex becomes distorted, it sends frigid air further south than normal.

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