The primary impacts of the nor'easter for Massachusetts include gusty winds, rough seas, and potential showers in coastal areas. Wind gusts up to 40 mph may affect the Cape and Islands, posing risks to small vessels and coastal activities. Rainfall is expected to be minimal and localized, with the South Shore unlikely to see significant precipitation. Temperatures will vary throughout the week, and colder conditions are expected as the storm moves eastward into the Maritimes.