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December 2000 nor'easter
The December 2000 nor'easter was a significant winter storm that impacted the Mid-Atlantic and New England regions of the United States around the end of the month. It began as an Alberta clipper that moved southeastward through the central United States and weakened over the Ohio Valley. However, it redeveloped off the coast of North Carolina and moved northward as it intensified. It moved into central Long Island and eventually tracked northward into New England. The storm dropped heavy precipitation throughout the Northeast, especially in northern New Jersey and eastern New York, where snowfall often exceeded . Even so, as it struck on a weekend, its effects were generally minor and mostly limited to travel delays, traffic accidents, and business closures.
==Synoptic history==
The storm developed as an Alberta clipper-type low pressure area that moved southeastward across the Great Plains and Midwest. Throughout North Dakota, Minnesota and Iowa, moderate snowfall accompanied the system. After weakening over the Ohio Valley, the storm redeveloped off the coast of North Carolina. In the days preceding the event, a cyclone over eastern Canada circulated cold air southward. Computer models indicated the potential for a major storm up to seven days in advance; however, initially, certain forecasts suggested that a separate storm over the southern U.S. would merge with the clipper. Instead, this feature moved out to sea.〔Kocin and Uccellini, p. 629〕
As the secondary storm began to intensify offshore, precipitation rapidly expanded and tracked northward towards southern Virginia, eastern Maryland and Delaware, largely in the form of freezing rain, ice, and snow. From 0200 UTC on December 30 to 1200 UTC, the cyclone intensified by 13 mbar, and continued to deepen for several more hours. Snowfall reached southern New Jersey between 0600 and 0800 UTC, and New York City at around 1000 UTC. Thundersnow developed within heavy bands in some areas.〔Kocin and Uccellini, p. 630〕 The significant snow was characterized by a sharp western cutoff; for example, in Chester County, accumulations ranged from around 6 inches in the far eastern parts of the county to only an inch along its western border with Lancaster County.
While located off the New Jersey coast, the storm stopped strengthening and slowly moved northward. The center was situated near central Long Island at 2100 UTC. Across eastern Long Island and parts of eastern New England, snow mixed with and, in some cases, changed over to rain. The surface low had moved into eastern Connecticut by early on December 31.〔 As it continued to head northeastward, a new center of low pressure developed near Boston and moved towards coastal Maine.〔Kocin and Uccellini, p. 636〕 The storm system had abated by January 1.
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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