October 29th Historic Early Season Snowstorm National Weather Service New York, NY October 29th 2011

 Meteorology

Synopsis
Low pressure rapidly organized off the Mid-Atlantic coast Saturday morning, October 29th, and then intensified as it tracked about 150 miles se of Long Island on Saturday and then just off Cape Cod Saturday night (lower right panel). This was in response to a strong northern stream shortwave pivoting towards the coast and a 120+ kt upper jet rounding its base (upper left and right panels). In the lower left panel...a strong low/mid level frontogenetic zones developed to the northwest of low pressure...whihc was the forcing for a band of heavy wet snow fall that swung through the NYC metro area early Saturday afternoon and then remained nearly stationary across interior protions of Northeastern New Jersey, the Lower Hudson valley, Southwestern Connecticut, and central and Western New England Saturday afternoon into Saturday night

300mb	500mb
850-700mb Frontogenesis	Surface