St. Patrick's Snowstorm
March 16-17, 2007

Category 2 (preliminary) on the Northeast Snowfall Impact Scale

Synopsis:

Low pressure system developed over the southeast states during Thursday afternoon on March 15th, and then tracked northeast while intensifying, reaching the Delmarva coast by Friday evening on March 16th, and then moving off the New England coast by Saturday morning on March 17th.

Surface Plots:

14Z March 16, 2007 Surface Plot
14Z March 16
(10 am)
18Z March 16, 2007 Surface Plot
18Z March 16
(2 pm)
23Z March 16, 2007 Surface Plot
23Z March 16
(7 pm)
04Z March 17, 2007 Surface Plot
04Z March 17
(4 am)
08Z March 17, 2007 Surface Plot
08Z March 17
(6 am)
14Z March 17, 2007 Surface Plot
14Z March 17
(10 am)

12Z March 16 2007: Surface --- 850 mb --- 500 mb --- 250 mb
00Z March 17 2007: Surface --- 850 mb --- 500 mb --- 250 mb
12Z March 17 2007: Surface --- 850 mb --- 500 mb --- 250 mb
00Z March 18 2007: Surface --- 850 mb --- 500 mb --- 250 mb

Snowfall Reports & Map

What Happened:

This storm brought widespread snowfall amounts of 10 to 20 inches across eastern New York and western New England, with some amounts near two feet across the eastern Catskill region, as well as within a band extending across southern Columbia, and northern Dutchess counties of New York.  The snow began across the lower mid Hudson Valley and northwest Connecticut during the mid morning hours of Friday, March 16th, and spread into the Capital Region during midday.  The snow did not reach portions of the western Mohawk Valley and southern Adirondacks until the late afternoon hours, as dry air remained in place longer, allowing the precipitation to remain aloft for several hours before reaching the ground.  This also allowed snowfall amounts to be less across this region, with generally 6 to 9 inches occurring.

Further to the southeast, some sleet mixed in with the snow, beginning during the early evening hours of Friday, and persisting into Friday night, keeping snowfall amounts a bit less across the Litchfield Hills and lower mid Hudson Valley, with an average of 8 to 12 inches occurring.