A morning storm arrives
New York City could be coated with eight to 12 inches of snow, the brunt of it falling during the morning commute, forecasters said. A winter storm warning is in effect until 6 p.m., and the city has urged residents to avoid unnecessary travel.
• Airports. The three main local airports — Newark, La Guardia and Kennedy — are expecting disruptions. The airlines recommend checking flight statuses ahead of travel. By 7:30 a.m., The Associated Press reported, nearly 1,700 flights had been canceled at the three airports. That’s about half of their daily fights.
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• The Long Island Rail Road has systemwide delays.
• Subways. As of 9:57 a.m., 1, 2, 3, 5, J, L, N and W lines are running with delays.
• New Jersey Transit. Rail service is running with adjustments on eight lines because of the storm, and it will be cross-honoring tickets on bus, rail and light rail lines.
• Metro-North. Trains are running with delays on the New Haven, Pascack Valley and Port Jervis lines.
• Here are service updates for some buses in New York and New Jersey.
• Staten Island Ferry. Service is moving about every 20 minutes because of low visibility and a mechanical issue.
• CitiBike is closed.
— JONATHAN WOLFE and ALEXANDRA S. LEVINE
Cities across the Northeast shut down
Schools and businesses across the Northeast are closed as the storm moves through. The National Weather Service predicted that parts of New England could get up to 18 inches of snow before the day is out.
Philadelphia, which is expected to see up to eight inches, declared a snow emergency to keep cars off the streets. The Pennsylvania Turnpike lowered its speed limit to 45 miles per hour, The A.P. reported, and most of the flights from Philadelphia International Airport had been canceled.
The governors of Massachusetts and Connecticut urged people not to travel unless necessary and told nonessential state employees not to come to work. The National Weather Service posted coastal flood advisories for much of the eastern-facing coastline of Massachusetts.
State offices in Rhode Island were also closed to nonessential employees, and Providence was expected to receive up to 17 inches of snow.
Snow began falling lightly in Boston on Thursday morning, with 18 inches or more expected by the end of the day. It is likely to be the biggest test for the city’s beleaguered public transportation system since the winter of 2015, when extended cold and four major snowstorms crippled the system and led to a $100 million investment in winter weather fixes.