Global Warming Is Making It Cold

From a Slate summary of a New York Times article about global warming and its effects on global weather patterns, in particular and seemingly paradoxically

Colder than normal winters.

Big blizzards always present an excellent opportunity for climate change-deniers to make jokes about global warming; during last winter’s D.C. snowstorms, Sen. Jim Inhofe showed off his grandchildren’s igloo, proudly decorated with Al Gore signs. Writing in the New York Times, forecaster Judah Cohen acknowledges that the last several winters have been “extraordinarily” cold and snowy, even though 2010 was the hottest year on record and next year could be worse. But Cohen says “we’re freezing not in spite of climate change but because of it.” He explains that increasing global temperatures have melted Arctic sea ice, making more moisture “available to fall as snow over the continents.” Siberia in particular has seen a huge increase in its snow cover. That snow affects the movement of the jet stream. “In winter, this change in flow sends warm air north from the subtropical oceans into Alaska and Greenland, but it also pushes cold air south from the Arctic on the east side of the Rockies,” he says. “Meanwhile, across Eurasia, cold air from Siberia spills south into East Asia and even southwestward into Europe.” Moisture-laden, colder-than-usual air means snowier-than-usual winters—and snow inside subway stations, people stranded on trains, and free parking in New York City.
Read original story in The New York Times | Monday, Dec. 27, 2010

This explanation may warrant some cross checking but to the amateur it would seem to make sense.

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