• Up to six inches of rain are expected in parts of the Northeast before the storm moves into Canada this evening.

  • Storm conditions are beginning to intensify in the New York City area. Up to two more inches of rain are expected to fall between 7 and 9 a.m. alone.

  • Some M.T.A. services were reporting disruptions and delays because of high winds and flooding. The Verrazzano Bridge was briefly closed.

Heavy rain and howling winds associated with a major coastal storm were pounding portions of the Northeast early Monday as officials in Philadelphia, New York and Boston asked residents to brace for flooding and power outages.

Across Rhode Island, New York, New Jersey, Connecticut and elsewhere, tens of thousands of customers were without power early Monday, according to PowerOutage.us, which compiles data from utilities.

The sweeping storm pummeled South Carolina and North Carolina over the weekend and was expected to continue moving northward Monday. It could dump up to six inches of rain across parts of the Northeast before moving into Canada by the evening hours, according to the National Weather Service. There was also a slight risk of excessive rainfall for parts of the northern Mid-Atlantic region northward to New England through Tuesday morning, the Weather Service said.

Storm conditions were expected to be at their worst during peak commuting time in the region early Monday, threatening to make travel difficult. The Metropolitan Transportation Authority said early Monday that some train service had been disrupted because of flooding and reported felled trees on tracks on multiple lines.

Several bus routes across the city were also running with delays because of heavy rain and flooding, officials said, and the New York City Ferry was suspending multiple services, including operation along the Rockaway route because of “extremely high winds.”