Some parts of Massachusetts are expected to see a heavy snow storm starting on Tuesday, according to National Weather Service forecasts — with some rain and snow hitting the Boston area.

“The big thing is going to be a low pressure coming by, mainly late Monday night to Tuesday,” said NWS meteorologist Matthew Belk. “That’s going to bring a possibility of some light snow changing over to rain in the city of Boston.

The week is forecasted to start with a sunny day Monday and highs in the low 40s in Boston, before the storm moves into the region on Tuesday, NWS states.

NWS issued a winter storm watch covering Tuesday morning to night for western and central Massachusetts, along with a swath of southern New England, warning of “heavy snow” with accumulations over 6 inches in some areas.

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