The term "black Moon" is sometimes used to describe the second new Moon in a month--sort of the opposite of a blue Moon (second full Moon in a month). In 2014, January has two new Moons, the first was on January 1 and the second will be on January 30.
At any new or full Moon, the tides are slightly higher and lower than at other times--these are called spring tides. For January 30, the Moon is also at perigee, the closest point of approach to Earth during the Moon's elliptical orbit for the lunar month. At the time of perigee, tides are also slightly higher/lower. When a new or full Moon coincides with perigee, it is causes a perigean spring tide. These tides are slightly higher and lower than a spring tide. For most places, there is no concern for flooding; exceptionally low-lying areas (in certain parts of the nation) may occasionally experience minor flooding. The only possibility for significant flooding would be if a major storm occurred at the same time.
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