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Image description: This graphic shows a wobbly polar vortex configuration in comparison to a more typical, compact configuration.
Learn how this wobbly polar vortex caused the recent cold spell across the country. 
Image from NOAA.

Image description: This graphic shows a wobbly polar vortex configuration in comparison to a more typical, compact configuration.

Learn how this wobbly polar vortex caused the recent cold spell across the country.

Image from NOAA.