Bitterly cold arctic air is pouring into the area, on the heels of an arctic disturbance crossing through New England.
As we move through the day today, this feature along with its accompanying arctic air and a flow of wind off the ocean are going to combine to produce periods of snow and snow squalls.
The extreme temperature difference between the arctic air and relatively mild ocean, plus a robust (and unusual) upper air wind off the ocean, are going to yield pockets of very heavy snowfall, some of which may rotate onto the Outer Cape at times.
The Outer Cape stands the best chance of seeing some meaningful accumulation today, with several inches of snow possible.
Admittedly, this a low confidence set-up as there is an outside chance for significantly more snow given the anomalous set-up.