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The initial week of January was the driest in history. And more than 95 percent of the U.S. had below-average snow cover-the greatest such percentage ever recorded-according to some intriguing data maps generated by the National Oceanic and Atmospheric Administration. An unusual region of atmospheric pressure over the Arctic has kept the polar jet stream (green) locked up at far northern latitudes, causing a warm, dry U.S. winter. [Source: Scientific American]
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