First Call for Weekend Snowfall
Several Inches Likely OverNight Saturday Into Sunday
Synoptic Overview:
The next in a succession of northern stream impulses will approach the area this weekend.
The primary difference with this system relative to many of the disturbances that we have dealt with this season is that looks to be intensifying on approach, as opposed to shearing out.
This is due at least in part to the Alaskan ridge growing in amplitude, which in turn lowers heights downstream and allows the wave to "dig" a bit on approach.
Expected Storm Evolution:
Snow looks to break out early in the evening on Saturday from southwest to northeast, and the precipitation shield will have overspread the entire region prior to midnight.
Snowfall will mix with sleet and rain along the south coast and especially the cape and islands during the predawn hours on Sunday, with a complete change to to rain likely over the outer cape and Nantucket island.
The heaviest amounts should occur in bands that will set up to north of the track of the developing mid level low during this time, along and north of the Mass pike.
Precipitation should begin to taper off Sunday AM, and wind down as snowfall everywhere by midday Sunday.
FIRST CALL:
Final Call will be issued on Saturday.