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NEW YORK — Waves splashed over the sea walls at the southern tip of Manhattan, already at Hurricane Irene levels Monday hours before the worst of a mammoth storm was to hit the nation's largest city with a wall of water that could reach 11 feet.
Gov. Andrew Cuomo closed two key tunnels to downtown Manhattan and the city canceled schools for a second day after shutting its mass transit system and ordering hundreds of thousands of people to leave their homes ahead of Hurricane Sandy's storm surge. While light rain fell steadily and several New Yorkers still bustled on the streets, officials warned residents to get out of the way.
"Don't be fooled, don't look out the window and say, it doesn't look so bad," Gov. Andrew Cuomo said. "The worst is still coming."
By midday Monday, minor flooding had affected some Long Island fishing villages and coastal towns, New York's Rockaway peninsula and a highway on the east side of Manhattan, officials said. More than 20,000 customers, mostly in Long Island, had lost power; most of the city's 3,600 outages were in Brooklyn.
The floor of the New York Stock Exchange was deserted in its first unplanned shutdown since the Sept. 11, 2001, terror attacks. Cuomo closed the flood-prone Brooklyn Battery and Holland Tunnels, by Monday afternoon. And Mayor Michael Bloomberg canceled school for the second day Tuesday, saying "there's no chance that mass transit will be back in time" by then.
As the worst of the storm still threatened to flood the subway system, lower Manhattan and flood-prone areas, the mayor urged stragglers from the 375,000 people he ordered out of waterfront areas to leave.
"Leave immediately. Conditions are deteriorating very rapidly and the window for you getting out safely is closing," he said.
On Monday, crowds gathered along the South Street Seaport, until police shooed them away. In Battery Park City, a complex of high-rise offices and apartment buildings erected on a landfill in lower Manhattan, holdouts watched as the Hudson rose and began to breach sections of scenic walkways along the river.
Many people were still out jogging, walking their dogs and even taking infants out in strollers amid gusts of wind.
Mark Vial pushed a stroller holding his 2-year-old daughter Maziyar toward the door of a building where they live on 15th floor.
"We're high up enough, so I'm not worried about flooding," he said. "There's plenty of food. We'll be ok."
Vial, 35, said his building had several holdouts. "The laundry room was packed last night," he said.
Some New Yorkers packed grocery stores for water and food and scrambled to get out of flood zones, while others insisted they weren't going anywhere.
At the South Street Seaport, where the East River was near the edge of the esplanade, brothers Justin and Adam Rashbaum were in shorts and deck shoes snapping images of the churning river. "It's a day off courtesy of Mother Nature," Adam Rashbaum said.
The storm, a predicted combination of Sandy, a wintry system moving in from the West and cold air streaming from the Arctic, could be most damaging because of the swelling waters.
The National Oceanic and Atmospheric Administration's environmental protection chief, Louis Uccellini, called the projected storm surge "the worst-case scenario" for New York City, Long Island and northern New Jersey.
An 11-foot surge would flood subway tunnels with damaging saltwater, and knock out the underground network of power, phone and high-speed Internet lines that are the lifeblood of America's financial capital.
The major American stock exchanges closed for the day, the first unplanned shutdown since the Sept. 11 attacks in 2001. The floor of the NYSE, typically bustling with traders on a Monday morning, fell within the city's mandatory evacuation zone. The United Nations canceled all meetings at its New York headquarters. New York called off school for the city's 1.1 million students.
The NYSE's parent company said late Sunday that the shutdown might be extended through Tuesday.
Bloomberg on Sunday announced a mandatory evacuation affecting low-lying areas from the beaches of Queens to Battery Park City. Subways and buses were shut down beginning 7 p.m. Sunday, leaving more than 5 million mostly carless daily riders on their own to get to higher ground.
Cuomo deployed National Guard troops to the city and Long Island. Consolidated Edison weighed the possibility of shutting down power in parts of lower Manhattan to protect equipment. Broadway shows were canceled for Sunday and Monday. One small hospital was being evacuated, while several others were moving patients to higher floors.
It marked the second time in 14 months that New York City has faced a scenario forecasters have long feared: a big hurricane hitting the city or a bit south, such that the cyclone's counterclockwise winds drive water into miles of densely populated shoreline.
Hurricane Irene ultimately came ashore as a tropical storm in Coney Island, with a 4-foot storm surge that washed over parts of the southern tip of Manhattan but didn't wreak the havoc that officials had feared, although it caused tremendous damage elsewhere. Some experts have said that a surge 3 feet higher could have caused huge damage.