Hurricane Sandy May Unleash Historic Floods in NYC

As Hurricane Sandy heads toward the East Coast, storm crews are placing hundreds of sensors to predict the toll of flooding in the region.

"The combination of an extremely dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters," according to a National Hurricane Center advisory.

New York City may see its biggest storm surges in history.

"With the high tide occurring tomorrow night, we are looking at many locations approaching record levels of storm surge," said National Weather Service spokesperson Sean Potter.?

Hurricane Irene, for instance, caused surging tides that reached only 4 feet (1.2 meters). In contrast, Sandy is expected to cause life-threatening flooding in New York Harbor and tides of 6 feet to 11 feet (1.8 to 3.3 meters) in areas of Long Island Sound, according to the National Weather Service.?For instance, the Battery in lower Manhattan is expected to see 11.7-foot storm surges, surpassing the 10-foot surges recorded in 1960 with Hurricane Donna, Potter told LiveScience.?

A full moon Monday may intensify storm surges, as the moon's tug will make high tides along the Eastern Seaboard about 20 percent higher than normal, Joe Rao, a meteorologist for News 12 in Westchester, N.Y., told LiveScience sister site OurAmazingPlanet.

The storm's projected duration may also worsen flooding. "We'll still see tropical storm-force winds occurring for 24-36 hours starting into tomorrow morning going into Tuesday afternoon," Potter told LiveScience. "That's one thing that really sets this storm apart compared to Hurricane Irene."

As of 11 a.m. ET on Sunday, Oct. 28, the center of Hurricane Sandy was located 250 miles (400 kilometers) southeast of Cape Hatteras, N.C., and 575 miles (930 km) south of New York City. The storm is moving toward the northeast near 14 miles per hour (23 kilometers per hour). The current forecast track puts the center of Sandy near the coast Monday night, according to the National Hurricane Center.

The winds will likely be near hurricane force at landfall, according to the National Hurricane Center advisory.

The U.S. Geological Survey (USGS), along with other federal agencies, are latching 150 storm surge sensors to poles on piers from Massachusetts to Chesapeake Bay. The gauges track wind gusts, rainfall and water levels at the coast, and eight of the sensors track the storm-tide in real-time as it reaches land.

The data could help scientists predict the toll of the storm. (Some 10 million people are predicted to be without power from the storm.) Data from past storms have helped researchers predict which areas will be hardest hit this time around. The sensors were first deployed during Hurricane Rita in 2005 and again during Hurricane Irene in 2008.

Tracking the toll of Hurricane Sandy will help predict flooding in future storms, according to the USGS.

"With Sandy wehave the opportunity to test and improve predictive models of coastal zone impact based on what we previously learned," said USGS director Marcia Hutt in a press release.

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Source: http://news.yahoo.com/hurricane-sandy-may-unleash-historic-floods-nyc-180511726.html

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