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.

The National Weather Service has issued a winter storm watch for this weekend in Massachusetts. See how much snow is expected

An approaching system could bring up to 5 inches of snow and ice, and disrupt morning and afternoon travel before a flip to rain in some places.

Snow is expected to stop in Worcester and the western part of the state before 9 a.m., gradually moving out of eastern Massachusetts by noon. Essex, Suffolk and Middlesex counties in the northeast part of the state may see snow showers through 5 p.m. on Sunday.

The map I’ve put together for snowfall totals has a fairly wide range of 4 to 8 inches. During Saturday, after we get even more information, I’ll try to start honing that down to see whether we’re going to be closer to the 4 inches or closer to 8 inches.

The National Weather Service has issued a winter storm watch for all of Massachusetts due to the potential for more than a half foot of snow across the region this weekend. Boston 25 Meteorologist Shiri Spear has us on a Weather Alert for Saturday night into Sunday morning.

A winter weather advisory is in effect in Massachusetts today as several inches of snow is expected to fall across the state, according to the National Weather Service's Boston office. Snow is already beginning in western Massachusetts as of 8 a.m. Thursday, and it will pick up in the eastern part of the state later this morning.

A winter storm warning was issued by the National Weather Service on Saturday at 2:55 a.m. valid from 7 p.m. until Sunday 1 p.m. for Northern Worcester and Southern Worcester as well as Franklin, Middlesex,