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December 1969 nor'easter
The December 1969 nor'easter was an intense winter nor'easter that impacted the Mid-Atlantic and New England regions of the United States between December 25 and December 28, 1969. The storm developed over Texas by December 25 and advanced eastward. On reaching the Eastern Seaboard, it intensified and turned northeastward, accelerating toward New England. There, the worst of the storm was felt on December 26 and 27. The low peaked in severity with a minimum barometric pressure of as it began pulling away from New England. The slow movement of the cyclone led to extremely heavy snowfall totals throughout the interior Northeastern United States, reaching in localized areas, although an influx of warmer air turned the precipitation to rain near the coast.
Due to a number of factors, including the high water content of the snow, pre-existing snowpack, and equipment failures, the storm proved difficult to recover from in Upstate New York and Vermont. Depths exceeding were reported as far south as Washington, D.C.. Drifts up to high blocked roadways, and at least 20 deaths were blamed on the nor'easter. In the hardest-hit areas, snow removal on roadways was severely delayed, isolating some communities. Following the storm, strong winds impeded cleanup efforts, and flooding became an issue near the coast as a result of excessive rainfall and ice jams.
==Background==
The winter of 1969–1970 continued a long-term El Niño from the previous winter,〔Kocin and Uccellini, p. 473〕 which produced two significant storms in the Northeast United States, including the "Lindsay storm". North Atlantic Oscillation (NAO) values ranged from neutral to negative during the general time frame of the nor'easter, trending more consistently negative in the days surrounding its genesis. NAO values became significantly negative immediately following the storm, signaling abnormally cold temperatures for the next month.〔 Before the cyclone's arrival, a high pressure area situated north of New England funneled cold surface temperatures into the region; the pressure system meandered toward the northeast as the storm approached, and on December 25 and 26, cold air damming and frontogenesis occurred along the East Coast.〔Kocin and Uccellini, p. 467〕
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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