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North American blizzard of 2003
The Blizzard of 2003, also known as the Presidents' Day Storm II or simply PDII, was a historical and record-breaking snowstorm on the East Coast of the United States and Canada, which lasted from February 14 to February 19, 2003. It spread heavy snow across the major cities of the Northeastern and Mid-Atlantic states, making it the defining snowstorm of the very snowy winter of 2002-2003.
All cities from Washington DC to Boston were covered in of snow〔(Historic Blizzards | Farmers' Almanac )〕 and those cities were brought to a standstill due to problems caused by temperatures and the snow. In Baltimore and Boston, this was the biggest snowstorm on record, with 28.2 and 27.5 inches (71.6 and 69.9 cm) respectively.
==Synoptic setup==
The severity of the Blizzard of 2003 can be attributed to the unusually favorable atmospheric conditions surrounding the storm (synoptic conditions). Most notably, the storm allowed for cyclogenesis off of the coastal Carolinas, a feature that is common to most major winter storms in the eastern parts of North America. This secondary system fed off the moisture of the Atlantic Ocean and enhanced precipitation totals from North Carolina to Massachusetts. Secondly, a high pressure system was in place over eastern portions of Canada, allowing for cold air to be brought down into the coastal areas in a process known as cold air advection. This cold air ensured that many areas where storms typically produce mixed precipitation received most or all precipitation in the form of snow.〔(【引用サイトリンク】 title=The President's Day Snowstorm II - A Case History )〕
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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