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These maps show how much snow is expected to fall in Mass. today

Expected snowfall on Friday.National Weather Service

Massachusetts and other parts of Southern New England will wake up to significant snowfall on Friday, with the storm beginning in most places before dawn, according to the National Weather Service.

A winter storm warning is in effect until 4 p.m. for portions of the eastern and southeastern part of the state, including in Boston, along with northern and southern Rhode Island.

Heavy snow is expected in those areas, the weather service said, with snow accumulation of 8 to 10 inches predicted, but higher amounts of up to 12 inches are possible, particularly in southeastern Massachusetts. Snow began falling well before sunrise Friday morning.

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A storm warning has also been issued through 2 p.m. on Friday for Essex, central Middlesex, and southern Worcester counties. Snowfall totals ranging from 6 to 8 inches are expected in these areas. Meanwhile, much of central and western Massachusetts is under a winter weather advisory.

Heavy snow is also likely on the Cape, where a winter storm warning is in effect until 4 p.m. on Friday. In Barnstable County, total accumulations of 2 to 7 inches are possible, forecasters said.

The official National Weather Service forecast of snow expected.National Weather Service
The high end of snow totals that could accumulate in the region.National Weather Service

The eastern portion of Massachusetts is likely to receive the greatest snowfall amounts with Boston expected to see up to 8 inches or more by Friday night, according to the weather service. Providence is expected to get a total of around 6 inches.

The western portion of the state is likely to see lower snowfall amounts, ranging from about 2 to 4 inches.

Between 1 a.m. and 7 a.m. on Friday, about 1 to 3 inches of snow was expected to fall throughout Massachusetts, with Boston and Plymouth likely to see between 2 and 3 inches early in the morning.

The amount of snow expected to fall on Friday morning.National Weather Service

From 7 a.m. through 1 p.m. on Friday, higher amounts of snow are expected to fall, with the southeastern portion of the state likely to see the heaviest amount of snow. Boston and Plymouth can expect an additional 4 to 6 inches to fall, according to the weather service.

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The amount of snow expected to fall from Friday morning through Friday afternoon.National Weather Service

There is also a risk of sleet and snow on Friday throughout the state, with the vast majority of Massachusetts at elevated risk of both. The morning commute will be very difficult, forecasters are warning, and those who plan to travel are encouraged to keep a flashlight and extra food and water in their cars in case of an emergency.

Residents have been urged to remain off the roads if possible due to the heavy snow creating poor visibility and slippery road conditions. The I-95 Boston to Providence corridor could see snow falling at a rate of 1 inch per hour from roughly 5 a.m. through 10 a.m., the weather service said.

Snow and sleet risk for Mass. on Friday.National Weather Service

Shannon Larson can be reached at shannon.larson@globe.com. Follow her on Twitter @shannonlarson98. Amanda Kaufman can be reached at amanda.kaufman@globe.com. Follow her on Twitter @amandakauf1.