Polar vortex to send bitter cold to the U.S. including DC area
The polar vortex is a ring of cold air that typically circles the Arctic. A strong jet stream essentially acts like a fence, keeping it locked there. If there's any weakening in the jet stream (the fence), the frigid air can become unstable and spill out. This sends the normally trapped cold air much farther south.
1don MSN
A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.
Fox Weather on MSN13h
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