A "supermoon" means that the new or full Moon is near or at perigee--the closest point of approach to Earth in its elliptical orbit for the lunar month. For January 30, the new Moon coincides with perigee (within about 12 hours), and can therefore be called a supermoon. Supermoons are more noticeable during a full Moon, appearing a bit larger than normal. When it occurs during a new Moon, most likely you will not be able to see it due to the view of the rising new Moon being obscured by daylight as the sun rises. Usually, people won't be able to see the Moon until 1 to 2 days after new.
During a new or full Moon, the tides are a bit higher and lower than usual--these are called spring tides. If perigee occurs at the same time as the new or full Moon, the tides are even a little more high and low--these are called perigean spring tides. A perigean spring tide will occur on January 30. Flooding is not usually a concern unless there is a large storm predicted.
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