BBC: More than one million Americans and Canadians are facing Christmas Day without power as a massive winter storm continues to pummel North America. A bomb cyclone, when atmospheric pressure plummets, has brought snow, strong winds and freezing temperatures. Nearly 250 million are affected, and at least 19 deaths have been linked to the storm that extends more than 2,000 miles (3,200km) from Quebec to Texas.
Ice Loss and the Polar Vortex: How a Warming Arctic Fuels Cold Snaps
The loss of sea ice may be weakening the polar vortex, allowing cold blasts to dip south from the Arctic, across North America, Europe and Russia, a new study says. InsideClimate
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