Add Yahoo as a preferred source to see more of our stories on Google. You've likely heard the term "polar vortex" virtually every winter since it first entered into popular culture during a bitterly ...
The vortex is strongest during the winter and usually weakens or even disappears in the summer. When the polar vortex weakens or even splits, it allows frigid air to escape and push southward toward ...
You've likely heard the term "polar vortex" virtually every winter since it first entered into popular culture during a bitterly cold January a decade ago. The polar vortex is a whirling cone of low ...
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