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March 2013 nor'easter
The March 2013 nor'easter was a powerful nor'easter that affected much of the United States, most notably New England. On March 6, the system moved into the Mid-Atlantic region of the east coast, and intensified into a nor'easter, dumping up to 3 feet of snow in some places. By late March 6, 2013, the nor'easter had knocked out power to about 250,000 homes and businesses.
==Meteorological history==
Just after the February winter storm, an extratropical cyclone developed on early March 1, 2013, in the Gulf of Alaska moved ashore in British Columbia. After moving ashore, the storm weakened as it moved into the Western United States. This prompted the Weather Channel to name the storm ''Saturn'', on March 2, because the storm was forecasted to have a much more significant impact in the US, particularly in the Northeastern United States. Over the next few days, the storm dumped large amounts of snow across the Western States and the Great Plains, affecting areas that were already impacted by a previous blizzard. The storm quickly moved eastwards while slowly restrengthening. On March 4, the storm developed a severe side over the southern states, after tapping into moisture coming from the Gulf of Mexico. On March 5, the storm developed into a blizzard, while it was over the midsection of the Eastern United States, adding more snow to areas that had already received record snowfall from previous major winter storms. The blizzard conditions resulted in multiple flight cancellations and traffic problems across the Eastern States. A maximum amount of 36 inches of snow was recorded near the Bear Paw Ski Bowl in Montana.〔 On March 6, the system moved off the coast of Virginia, and intensified into a nor'easter. The storm curved towards the northeast, and began impacting New England. Light precipitation began as early as the morning of Wednesday, March 6. This precipitation started as drizzle but changed over to light snow showers as the day progressed. On the morning of Thursday, March 7, heavy snow began in parts of Connecticut, followed by a lull. This period of snow led to many 90 minute delays for Connecticut school districts. On Thursday, March 7, the nor'easter slowly began pulling away from the east coast as it moved northeastward. However, the storm continued to intensify, and brought heavy snow and powerful winds to parts of New England beginning Thursday night. From late March 7 to March 8, the nor'easter absorbed a smaller system coming in from the west, adding much more moisture to the storm, which resulted in heavy snowfall across parts of New England. Heavy snow in southern New England continued from Thursday night through much of the day on Friday. Over 2 days, the storm had dumped 10+ inches of snow across 11 states from Montana to Massachusetts. This added more snow to an already record-breaking snowfall season, which was brought on by multiple previous winter storms from February. Early on March 8, the nor'easter stalled off the coast of northern New England while maintaining its intensity, due to a blocking ridge of high pressure over Newfoundland. Later on March 8, the nor'easter began affecting southern Newfoundland, while continuing to intensify. At this time, the nor'easter reached its peak intensity of 986 millibars. On March 9, the ridge of high pressure over Newfoundland weakened enough for the nor'easter to begin moving out to sea. Up to 29.8 inches of snow were recorded in Milton, Massachusetts, by the end of the storm's snowfall on March 9. The nor'easter slowly weakened while moving eastwards, and its winds were still felt for several hours on March 9 after the snowfall had ended. By March 10, the nor'easter had completely left the east coast.
On March 11, the nor'easter reached the middle of the North Atlantic Ocean and continued weakening, as it slowly moved eastwards. On the same day, the nor'easter lost its frontal boundary and became an Upper-level low, and its eye began to shrink. On March 12, the nor'easter stalled, and began absorbing moisture coming from the tropics, and the storm lost its eye. On March 13, the system began losing its organization, and spawned a new frontal low to the north, which brought thunderstorms and strong winds to the Azores Islands. The storm slowly began moving eastward, as it continued weakening steadily. On March 14, The storm began to accelerate towards the northeast and became an extratropical storm again. Later on the same day, the system slightly reintensified and absorbed the new low, while spawning a few small circulations around the edge of the storm. The storm brought rain to Madeira, and brought cloudy weather to the Canary Islands. On March 15, the nor'easter began to rapidly weaken, and lost a lot of moisture, as it continued accelerating towards Western Europe. On March 16, the system began interacting with a much more powerful storm complex situated over the United Kingdom, and brought thunderstorms to parts of Western Europe. On March 17, the system rapidly became disorganized as it began being absorbed by the larger storm complex. During the next several days, the storm system continued to move eastward, while slowly degenerating. On March 21, the March 2013 nor'easter was completely absorbed by the larger storm complex, while located over the northern Adriatic Sea.〔http://www.met.fu-berlin.de/de/wetter/maps/Analyse_20130321.gif〕
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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