Congrats to MVY for a white Christmas.
Made some adjustments to PoPs for the band of ocean effect snow affecting the Islands, leaning heavily on 06z 3km NAM which has a great handle on its current position and expected trends. This is an unusual situation that we often only see with SW flow when there is a departing arctic airmass. It`s actually rather shallow, only up to around 3,000 ft in depth, which is why it looks unimpressive on radar, but IR satellite shows its origins are in Long Island Sound and it extends across Block Island to Martha`s Vineyard and Chatham.