Frigid air from the North Pole: What's this polar vortex? - CNN International

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

Winter weather grips U.S.

HIDE CAPTION

Dr Oz

Mary Kay Letourneau

Fox 8 News

polar vortex

polar vortex