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A rapidly developing coastal nor'easter will bring blizzard conditions to the eastern areas of Massachusetts. As the storm becomes very strong this evening and overnight, winds will increase and snowfall rates of 1 to 2 inches per hour will be common across much of coastal Massachusetts. To the west of Route 495, the snow will be less intense and the snowfall totals will be less.
Travel is not recommended this evening, especially along the coastline where the snow and wind will be most severe.
Over Cape Cod, the air is mild enough so the precipitation will begin as rain or a mix of rain and snow. After a few hours of mixed precipitation snow overtake the rain and accumulations will increase rapidly.
Blizzard warnings are in effect for Cape Cod and the Islands as well as the North Shore. Blizzard conditions occur when winds reach 35 miles per hour and visibility is lowered to one-fourth of a mile or less for a three-hour period due to snow.
Cape Cod will feel the full force of the storm with snowfall accumulating at 1 to 3 inches per hour this evening. Some roads over Cape Cod could become impassable for a time during the middle of the evening. Winds will gust over 50 miles per hour at times along the coast and power outages are likely in some places.
The core of the storm will be during the evening from about 6 p.m. until midnight. After this time the snow will begin to end over Worcester and this back edge will push eastward to the coast before sunrise Sunday. Sunshine returns for Sunday and it will be blustery and cold.
Follow updates from David Epstein on Twitter @growingwisdom.