This winter, with record snow in New Orleans and drought and destructive wildfires in Southern California, has not been normal.

Much of the U.S. is being blasted by ice, snow and wind, as the polar vortex that dipped south over the weekend is maintaining its frigid grip.

The polar vortex that has dealt the most brutal winter to much of the US in recent years is about to be broken down – but not before unleashing a late-season cold and the biggest yet.

This is the hemispheric polar vortex—not the big bad polar vortex from television weather, but a permanent, extensive feature centered on both poles.

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