A polar vortex has brought arctic air to the U.S. including DC area
WASHINGTON — We are in the middle of a blast of extreme cold weather in D.C. The polar vortex has shifted, spilling cold air ...
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Why Polar Vortexes Are Becoming More Common
Why Polar Vortexes Are Becoming More Common Understanding the Polar Vortex The polar vortex is like a massive whirlpool of ...