The storm — blustery in some places, blinding in others — was a swirling, sprawling mass with a reach of nearly 1,000 miles. It had already largely immobilized Washington, Baltimore and Philadelphia on its way to New York. It all but stopped airline and railroad travel, flooded low-lying beaches and brought down trees and power lines, leaving thousands without electricity. In New York City, the Metropolitan Transportation Authority suspended bus service at midday and planned to halt elevated subway service and commuter rail service later in the afternoon. In New Jersey, officials suspended most public transit, including commuter rail service, light rail service and buses.