Metro

These maps show how much snow Mass. could get Sunday

Boston Common.
Craig F. Walker/Globe staff
Boston Common.

This weekend’s winter storm is finally beginning to come into focus. Beginning Saturday afternoon, Massachusetts will get hit with heavy, mixed precipitation. Because it’s not yet clear where the rain/snow line will fall, forecasters don’t have high confidence about accumulation totals and warned the snow totals would probably change.

Here’s what the National Weather Service is saying about what could hit the region this weekend:

Snow totals

The Friday afternoon forecasts released by the National Weather Service were showing more snow falling from this storm than predicted Thursday afternoon. Forecasters are now expecting 7 inches in the Boston area by the time all is said and done Sunday evening.

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The South Shore and the Cape and Islands could see less accumulation — just a few inches in some places. West of the city, Worcester could see up to 11 inches, while Amherst could see up to 13 inches.

High-end forecast

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Forecasters are predicting a one in 10 chance of higher snowfall amounts, and if that comes to pass, the Boston area would see up to 12 inches, while Worcester would see 14 inches, and the Cape and Islands would see 2 to 5 inches (with the exception of the outer Cape, which would see more).

Low-end forecast

Forecasters have low confidence that the region could see less snow, but in that scenario Boston would see just a few inches snow, while the Cape and Islands would not see any accumulation and Worcester would get about 3 inches.

Ice

Icing will also be a factor in this storm, particularly in Southeastern Massachusetts and Rhode Island. Snow is expected to change to rain in many areas and forecasters are expecting freezing rain in interior regions. Sunday evening, temperatures will drop, raising the possibility of flash freezing on wet surfaces.

Timing

Western Massachusetts will see snow first, with precipitation arriving around 6 p.m. Saturday. Snow arrives around 6 to 7 p.m. in Worcester and Boston. Precipitation is expected to arrive on the South Shore and Cape and Islands around 8 to 9 p.m., according to the National Weather Service.