As many as 50 million Americans living in the Northeast Corridor from Boston to Washington are bracing for the Frankenstorm, the combination of Hurricane Sandy, high tide and a nor’easter, which is likely to create storm surges of up to 11 feet in places that do not normally contend with them. Manhattan, for example. Or Atlantic City. Or Long Island’s south shore. Or Long Island’s NORTH shore, simultaneously. The National Hurricane Center describes it as a “life-threatening” storm surge. The shallowness of the water near the coast will make the storm surge higher, especially in and around the New York Harbor area.