Winter Storm & Flooding
Heavy Rainfall - Snowmelt - Ice Jams
March 6-7, 2011

A cold front moved gradually southeastward across the region during the day on Sunday, March 6th, as a wave of low pressure moved northeastward along the boundary Sunday night into Monday, March 7th. To the south of the boundary, it was mild as the area was in the warm sector of the low pressure system. The storm tapped into both Atlantic and Gulf moisture, resulting in heavy rainfall of 1 1/2 to 4 inches across the central and southeastern Catskills, mid Hudson Valley, Taconics, Washington County, Berkshires, southern Vermont and Litchfield County Sunday, March 6th, into Monday, March 7th. The heavy rainfall, combined with runoff from snowmelt due to the mild temperatures, resulted in widespread flooding of rivers, streams, creeks, and roads. Ice jams occurred resulting in flooding on the East Canada Creek and Sacandaga River in east central New York and on the Rocky River and West Branch Deerfield River in southern Vermont.

Colder air was drawn into the area in the wake of the boundary, changing the ongoing rain to mixed precipitation, freezing rain and sleet, then to snow. The period of mixed precipitation only lasted a couple hours, except for across a portion of the Capital District where a prolonged period of mostly sleet occurred and across a portion of the Taconic where a prolonged period of freezing rain occurred.

Heavy snow accumulated across the western Adirondacks, Mohawk and Schoharie Valleys, the central and eastern Catskills, the Lake George Saratoga region, and across the Capital District. One to 2 feet of snow was reported across the southern Adirondacks and Mohawk Valley, 8 to 18 inches across the Lake George Saratoga region, Helderbergs, and Schoharie Valley, with 5 to 8 inches of snow and sleet across the Capital District on top of the quarter to about a half of an inch of ice accretion. Up an in inch of ice accumulated in portions of the central and southern Taconics particular in the Towns of Amenia, Northeast and Dover. Numerous power lines were downed, trees and power poles snapped resulting in power outages and numerous road closures in the area.

The snow came down heavy at times, with snowfall rates of 1 to 2 inches per hour. In addition, brisk northerly winds resulted in blowing and drifting of the snow during the morning hours. This combination of heavy snow, along with blowing and drifting of the snow made it difficult for snow plows to clear the roads. The heavy snow and sleet resulted in widespread power outages, school closures, traffic accidents and even a few roof collapses.

Snow, Ice and Rainfall Reports

River Flooding - Hydrographs

Albany Upper Air Soundings - March 6, 2011
7 am EST
7 pm EST
ALY Upper Air Sounding
ALY Upper Air Sounding

Surface Maps
Surface Map 7 pm March 5, 2011
7 pm - March 5, 2011
Surface Map 10 pm March 5, 2011
10 pm - March 5, 2011
Surface Map 1 am May 26th, 2011
1 am - March 6, 2011
Surface Map 4 am March 6, 2011
4 am - March 6, 2011
Surface Map 7 am March 6, 2011
7 am - March 6, 2011
Surface Map 10 am March 6, 2011
10 am - March 6, 2011
Surface Map 1 pm March 6, 2011
1 pm - March 6, 2011
Surface Map 4 pm March 6, 2011
4 pm - March 6, 2011
Surface Map 7 pm March 6, 2011
7 pm - March 6, 2011

Surface Map March 6, 2011
Surface Map 7 am EST March 6, 2011
500 mb Map March 6, 2011
500 mb Map 7 am EST March 6, 2011
Surface Map March 7, 2011
Surface Map 7 am EST March 7, 2011
500 mb Map March 7, 2011
500 mb Map 7 am EST March 7, 2011