The snow will arrive Saturday between 10 p.m. and midnight. Once it arrives, it will hit the ground running. The majority of the snow accumulation will occur between midnight and 7 a.m. on Sunday. There will be some light snow and flurries between 7 a.m. and noon but very little additional accumulation.

More than 6 inches of snow is possible across Massachusetts this weekend, according to the National Weather Service’s Boston office.

On Thursday at 2:39 p.m. a winter storm watch was issued by the National Weather Service valid from Saturday 7 p.m. until Sunday 4 p.m. for Franklin, Hampshire and Hampden counties.