Led by members of the NASA Sea Level Change Team from the University of Hawaii, the study says that high tide flooding could happen more frequently on several U.S. coasts. Flooding at high tide, often called nuisance flooding, already occurs with regularity in many coastal communities as water routinely sloshes into streets, yards and businesses.
Two factors could converge to worsen flooding at high tide, the study says: rising sea levels fueled by climate change — and the moon.
The moon's orbit is due for its regular "wobble." That is entirely natural, NASA says, and it has been recorded as far back as 1728. Half of the moon's 18.6-year cycle creates lower high tides and higher low tides; the other creates higher high tides and even lower low tides.