A polar vortex could cause light snow over the weekend in Knoxville. A polar vortex is to blame for freezing temperatures.
two bands of fast-moving air – the polar jet stream and the stratospheric polar vortex – sometimes tango together to influence weather in the northern hemisphere. As the Arctic continues ...
Ben Noll, The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States ...
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