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.

A winter storm heading toward Massachusetts is expected to bring widespread snow and make travel very difficult.