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

The National Weather Service issued a winter storm watch for all of Massachusetts on Thursday afternoon ahead of a system that could bring at least a half foot of snow to the region this weekend.

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.