SHIP BOTTOM, N.J. (AP) -- Tens of millions of people in the eastern third of the U.S. in the path of the unprecedented freak storm had hours Sunday to prepare for the first raindrops that were expected later in the day, to be followed over the next few days by sheets of rain, high winds and even heavy snow.
The warning from officials to anyone who might be affected path was simple: Be prepared and get out of the way.
President Barack Obama is going to the headquarters of the Federal Emergency Management Agency to get an update on plans for responding to Hurricane Sandy.
The National Response Coordination Center in Washington is where FEMA is managing the deployment of federal resources and teams to states along the East Coast ahead of the big storm.
The White House says Obama will participate in a briefing on the storm and receive updates on federal efforts to help local responders in areas in the storm's path.
Later Sunday the president will head to Florida where he's campaigning on Monday.
Hurricane Sandy was headed north from the Caribbean, where it left nearly five dozen dead, to meet a winter storm and a cold front, plus high tides from a full moon, and experts said the rare hybrid storm that results will cause havoc over 800 miles from the East Coast to the Great Lakes.
"I've been here since 1997, and I never even put my barbecue grill away during a storm," Russ Linke said shortly before he and his wife left Ship Bottom on Saturday. "But I am taking this one seriously. They say it might hit here. That's about as serious as it can get."
He and his wife secured the patio furniture, packed the bicycles into the pickup truck, and headed off the island.
The danger was hardly limited to coastal areas. Forecasters were far more worried about inland flooding from storm surge than they were about winds. Rains could saturate the ground, causing trees to topple into power lines, utility officials said, warning residents to prepare for several days at home without power.
States of emergency were declared from North Carolina, where gusty winds whipped steady rain on Sunday morning, to Connecticut. Delaware ordered mandatory evacuations for coastal communities by 8 p.m. Sunday.
Officials were particularly worried about the possibility of subway flooding in New York City, said Louis Uccellini, head of environmental prediction for the National Oceanic and Atmospheric Administration.
Sandy was at Category 1 strength, packing 75 mph winds, about 260 miles southeast of Cape Hatteras, N.C., and moving northeast at 10 mph as of 8 a.m. Sunday, according to the National Hurricane Center in Miami. It was about 395 miles south of New York City.
The storm was expected to continue moving parallel to the Southeast coast most of the day and approach the coast of the mid-Atlantic states by Monday night, before reaching southern New England later in the week.
The storm was so big, however, and the convergence of the three storms so rare, that "we just can't pinpoint who is going to get the worst of it," said Rick Knabb, director of the National Hurricane Center in Miami.
"You never want to be too naive, but ultimately, it's not in our hands anyway," said Andrew Ferencsik, 31, as he purchased plywood and 2-by-4 lumber from a Home Depot in Lewes, Del.
New Jersey Gov. Chris Christie, who was criticized for not interrupting a vacation in Florida while a snowstorm pummeled the state in 2010, broke off campaigning for Republican presidential nominee Mitt Romney in North Carolina on Friday to return home.
"I can be as cynical as anyone," said Christie, who declared a state of emergency Saturday. "But when the storm comes, if it's as bad as they're predicting, you're going to wish you weren't as cynical as you otherwise might have been."
Up and down the Eastern Seaboard and far inland, officials urged residents and businesses to prepare in ways big and small.
New York Gov. Andrew Cuomo closed schools and ordered mandatory evacuation in some low-lying areas ahead of storm. He also was shutting down subways at 7 p.m. Sunday in advance of massive storm.
Amtrak began canceling train service Saturday night to parts of the East Coast, including between Washington and New York. Airlines started moving planes out of airports to avoid damage and adding Sunday flights out of New York and Washington in preparation for flight cancellations on Monday.
The Virginia National Guard was authorized to call up to 500 troops to active duty for debris removal and road-clearing, while homeowners stacked sandbags at their front doors in coastal towns.
In Arlington, just outside Washington, D.C., a few shoppers strolled in and outside a Giant supermarket. Cathy Davis, 40, said the supermarket was sold out of the water she wanted to purchase, but she wasn't doing much else to prepare. She figured she would bring her outdoor furniture inside later in the day, and might make some chili.
She said the storm did lead her to decide against decorating for Halloween.
"I was like, `eh, it will just be blown away anyway,"' she said. "What's the point."
President Barack Obama was monitoring the storm and working with state and locals governments to make sure they get the resources needed to prepare, administration officials said.
In North Carolina's Outer Banks, there was some scattered, minor flooding at daybreak Sunday on the beach road in Nags Head. The bad weather could pick up there later in the day, with the major concerns being rising tides and pounding waves.
DeWitt Quinn, 63, from the mainland city of Badin, N.C., was in the Outer Banks for his annual fishing trip when Sandy promised to disrupt his plans. He spent all day Saturday fishing from shore and a boat as the storm built up. A former member of the Coast Guard, Quinn said he was planning Sunday to spend the day inside with his buddies cleaning and preparing a two-foot-long puppy drum fish caught Saturday for cooking.
"We've got cards. We've got computers. We've got food. We're going to cook our brains out and eat very well," Quinn said.
In New Jersey, hundreds of coastal residents started moving inland. Christie's emergency declaration will force the shutdown of Atlantic City's 12 casinos for only the fourth time in the 34-year history of legalized gambling here. City officials said they would begin evacuating the gambling hub's 30,000 residents at noon Sunday, busing them to mainland shelters and schools.
The storm also forced the presidential campaign to juggle schedules. Romney scrapped plans to campaign Sunday in Virginia and switched his schedule for the day to Ohio. First lady Michelle Obama canceled an appearance in New Hampshire for Tuesday, and Obama moved a planned Monday departure for Florida to Sunday night to beat the storm. He also canceled appearances in Northern Virginia on Monday and Colorado on Tuesday.
Eighty-five-year-old former sailor Ray Leonard had a bit of advice for those in the path of the storm. Leonard and two crewmates in his 32-foot sailboat, Satori, rode out 1991's infamous "perfect storm," made famous by the Sebastian Junger best-selling book of the same name, before being plucked from the Atlantic off Martha's Vineyard, Mass., by a Coast Guard helicopter.
"Don't be rash," Leonard said Saturday from his home in Fort Myers, Fla. "Because if this does hit, you're going to lose all those little things you've spent the last 20 years feeling good about."