Add Yahoo as a preferred source to see more of our stories on Google. The first of what is expected to be three December Polar vortex waves has blanketed the Philadelphia region with frigid ...
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What if the polar vortex became a regular winter pattern? Scientists weigh in
Every winter, millions of people brace for news about the polar vortex - that vast, spinning mass of frigid Arctic air high in the stratosphere that occasionally escapes its usual boundaries and ...
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