Broad moist SW flow aloft along the Eastern Seaboard with multiple
short waves/speed maxes within the flow, will overrun cold dome at
the surface across MA/RI/CT, with temps in the 20s and dew pts in
the single digits. However with mid level flow very sheared/limited
cyclonic curvature, surface frontal waves sliding south of New
England are of low amplitude and elongated. This also results in 850
mb jet/CCB well offshore, along with its attending thermal and
moisture advection. The net result is a long duration of mainly
light snow beginning this afternoon and continuing into Fri evening.