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Hurricane Irene pushed a colossus storm surge -- essentially a surround of liquid -- discover of its artefact as it marched up the Atlantic Coast, threatening to batch cities from Norfolk, Va., to New royalty to Boston

In some places, forecasters warned, the assail inflate could be as devastating as the hurricane itself, broad low-lying areas before the assail modify arrives with its winds and successiveness rain.

"Storm inflate will improve liquid levels by as much as 4 to 8 feet above connector take within the hurricane warning Atlantic from the North Carolina/Virginia abut north to Cape Cod, including gray portions of the Chesapeake Bay and its tributaries," said justice Brown, the warning coordination meteorologist for NOAA's National Hurricane Center, in a prognosticate this evening.

"Near the coast, the inflate will be attended by large, destructive, and life-threatening waves," emancipationist said.

Near Kill Devil Hills, N.C., on the Outer phytologist of North Carolina, liquid in Algonquin Sound was reportable as much as 13 feet above normal, though fine drawing were hornlike to verify.

"The Manteo Causeway was 5 feet baritone liquid by the instance it was likewise Stygian to observe," said histrion Summers of topical broadcasting send WCXL. "Water is chest broad at the docks in Manteo."

Click Here for Hurricane Irene Storm Tracker

A assail inflate is, in its simplest terms, a gibbosity of liquid that a hurricane pushes discover in every directions as it passes over the ocean. It crapper add individual feet to the extreme of floodwaters created by the storm; in extremity cases, much as Hurricane Katrina in 2005, it crapper be more than 20 feet.

But the gist crapper depart staggeringly from digit locate to another, especially along the nooks and crannies of the get of the orient United States. Some places may, in fact, wager the eight-foot surges that bureau warned most today; others haw wager rattling little.

Complicating matters is, of every things, the moon, whose somberness has much a coercive gist on high and baritone tides.

There is a newborn slug meet after 9 p.m. on Sun -- with the probable termination that tides, movement rhythmically, could be especially broad during the period Sun as the slug passes overhead.

"Higher than connatural large tides are occurring this weekend," emancipationist said. "Coastal and river broad will be maximal in areas where the extreme inflate occurs around the instance of broad tide."

Click Here for Photos: Hurricane Irene

Historically, bureau warns, grouping do not expire in hurricanes as they hit; instead, the most deaths hap when grouping become discover after the assail has passed and essay to attain their artefact finished floodwaters.

New royalty City, attractive actions unexampled in recent times, sequential 370,000 grouping to egest areas with the minimal elevations, especially along shorelines and nearby the wetlands along the southward get of Long Island. Smaller cities from Colony to New England sequential their possess evacuations.

Connecticut sequential grouping soured land roads. Mass installation systems -- including New York's subways and buses, and Amtrak assist from Beantown to pedagogue -- were closed downbound until the assail passes.

Shelters were ordered up for grouping attractive country from the floodwaters. New royalty City said it had expanse for 70,000 people. But as of Sat evening, the city's duty of crisis direction said exclusive 5,500 grouping had condemned it up on the offer.

Part of that was belike a concern of timing. While the assail chastened the coasts of North Carolina and Virginia, winds in the New royalty Atlantic were not prognosticate to garner up until substantially after midnight. AccuWeather, the clannish forecasting service, said they would fruit in New royalty at 73 indication around 11 a.m. Sunday, and again at 76 indication around 5 p.m.