Hello folks,

We are still collecting information on the December 9, 2009 snowfall event throughout the Tri-State Area. We have completed a sufficient list of information and totals to complete a hand drawn plot and computer-generated contour map of snowfall totals. The contoured map has been included below. This storm will remain open for reports for the next several days. As usual, either respond to this topic with your location and total, or email us with your report. It will be included into the data and a finalized map will be released, most likely a few days from now. The two maps are included below with the storm description/etc.

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A strong low pressure system moved into the Great Lakes overnight and tremendous isentropic lift and warm air advection drove a wall of heavy precipitation into the tri state region. Much of the immediate coast and shore was experiencing an onshore flow, and many of those areas turned over to rain without significant accumulation. However, there was enough cold air entrenched so that areas along the North Shore of Long Island and South Shore of Connecticut would pick up a few inches of wet snow before changing over later in the morning. Areas further northwest were helped by impressive dynamics aloft, and held off the warm air advection, accumulating several inches of snow. Higher elevation played a role in this storm, as Northwest NJ, Southeast New York and Northwest Connecticut cashed in a significant snowstorm. The precipitation then ended as rain across much of the area before a mid level dry slot cut in through the region in response to a secondary low developing over Southern New England.