Mixed Precipitation Storm
March 2, 2007

Synopsis:

Low pressure formed over the deep south by mid week, February 28th. The low strengthen and headed northeast toward the Upper Mid West / Great Lakes region on Thursday . By Friday morning, March 2nd, deep low pressure was located over the western Great Lakes with secondary development occurring along the mid Atlantic Coast. The inland low over the Great Lakes remained the primary low during this event. The thermal structure associated with this event was very complex. With the primary low passing to our west, the region was located on the warm side of the system allowing warmer air to first move aloft and eventually to the surface across much of the area.

What Happened:

A band of snow developed and moved into the region during the late afternoon and evening of 1 March. However, the low levels were so dry that most of the precipitation did not reach the ground. During the late evening, just prior to midnight, the leading edge of the deeper moisture rapidly spread north and east across our region.

Precipitation began as a brief period of snow and sleet from the Mohawk Valley and Schoharie Valleys through the Catskills, Poughkeepsie area and northwestern CT. The precipitation began as snow in the eastern Adirondacks, Lake George Area, southern Vermont and the Berkshires.

The precipitation quickly changed to rain over the southern Catskills and Poughkeepsie area, as freezing rain and an occasional mix with sleet became the predominant precipitation type across the Mohawk and Schoharie Valleys, northern Catskills, Capital District, Berkshires and parts of northwestern Connecticut between midnight and sunrise.

Based on this rapid precipitation transition. Snow mixed with sleet after sunrise in the Adirondacks and Lake George area, while sleet and freezing rain pushed to the Glens Falls area and southern Vermont. Freezing rain and sleet continued in the Mohawk and Schoharie Valleys into the Capital District, Berkshires and northwestern Connecticut through the morning, becoming just rain in many areas before noon.

Much of the Adirondacks and higher elevations of southern Vermont had mostly snow and sleet throughout the storm. Freezing rain and sleet persisted in favored, protected regions of the Mohawk and Schoharie Valleys, Capital District, Berkshires and northwestern Connecticut through much of the morning of 2 March.

The combination of moderate to heavy rain and blocked storm drains result in minor urban flooding by mid morning across the Capital District, parts of the Mohawk Valley, Catskills, Taconics and northwestern Connecticut.

Precipitation and Snowfall Reports

Soundings from Albany NY:

KALB Sounding 12Z March 1, 2007
12Z March 1
(7 am)
KALB Sounding 00Z March 2, 2007
00Z March 2
(7 pm March 1)
KALB Sounding 12Z March 2, 2007
12Z March 2
(7 am)
KALB Sounding 00Z March 3, 2007
00Z March 3
(7 pm March 2)

Soundings from Upton NY - Long Island:

KOKX Sounding 12Z March 1, 2007
12Z March 1
(1 pm)
KOKX Sounding 00Z March 2, 2007
00Z March 2
(7 pm March 1)
KOKX Sounding 12Z March 2, 2007
12Z March 2
(7 am)

12Z Mar 1 2007: Surface --- 850 mb --- 500 mb --- 250 mb
00Z Mar 2 2007: Surface --- 850 mb --- 500 mb --- 250 mb
12Z Mar 2 2007: Surface --- 850 mb --- 500 mb --- 250 mb
00Z Mar 3 2007: Surface --- 850 mb --- 500 mb --- 250 mb