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Winter of 2009–10 in Europe
The winter of 2009–2010 in Europe was unusually cold. Globally, atypical weather patterns brought cold, moist air from the north. Weather systems were undergoing cyclogenesis from North American storms moving across the Atlantic Ocean to the west, and saw many parts of Europe experiencing heavy snowfall and record-low temperatures. This led to a number of deaths, widespread transport disruption, power failures and the postponement of a number of sporting events.
==Cause==
The cold weather was caused by high pressure over Greenland and Iceland causing weather patterns to be forced southward, a phenomenon described by meteorologists as the Arctic Oscillation and also the North Atlantic Oscillation which were negative compared to normal. The North Atlantic Oscillation in Winter 2009/10 was lower than during any winter in over a century and this resulted in more easterly winds bringing cold air into Northern Europe from Siberia and the Arctic. Scientists have shown that El Nino, the Quasi-Biennial Oscillation and solar variability all conspired to drive this extreme winter.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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