From the National Weather Service:
[7 am] Unfortunately still lots of uncertainty regarding the track & intensity of an ocean storm Sunday.
Local forecast from NOAA:
URGENT - WINTER WEATHER MESSAGE National Weather Service Taunton MA 442 AM EDT Sat Mar 18 2017 MAZ022-023-181645- /O.CON.KBOX.WS.A.0007.170319T0000Z-170320T0000Z/ Barnstable MA-Dukes MA- Including the cities of Chatham, Falmouth, Provincetown, and Vineyard Haven 442 AM EDT Sat Mar 18 2017 ...WINTER STORM WATCH FROM THIS EVENING THROUGH SUNDAY EVENING... * LOCATIONS...Cape Cod and Marthas Vineyard. * HAZARD TYPES...Heavy, wet snow. * ACCUMULATIONS...Snow accumulation of 3 to 5 inches. * TIMING...Snow will begin to overspread the area late tonight continuing through Sunday evening with the heaviest snowfall occurring around Sunday morning. * IMPACTS...Snow will have a heavy, wet consistency. Combined with forecast strong northeasterly winds, with any clumping in trees there is the possibility for downed limbs resulting in the risk of power outages. This in addition to potential accumulation along area roadways which will make for slick, hazardous travel. * DISCUSSION...While forecast snowfall accumulations are below warning criteria, the watch has been issued to account for the potential impacts of downed limbs and power outages. The watch has also been maintained due to the lowered confidence concerning storm track and intensity in proximity to Southern New England. * WINDS...Northeast 25 to 35 mph with gusts up to 55 mph. * VISIBILITIES...One quarter to one half mile at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is a potential for significant snow, sleet, or ice accumulations that may impact travel. Continue to monitor the latest forecasts. Be prepared to modify travel plans should winter weather develop.