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March 9, 2026

America July 16, 2021

Under a Wobbling Moon: NASA Says to Expect Floods

America ı By Jackie Allen

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A study from NASA and the University of Hawaii was published this month in the journal Nature Climate Change. It details how a wobbling moon may lead to record flooding by the mid-2030s. “The higher seas, amplified by the lunar cycle, will cause a leap in flood numbers on almost all U.S. mainland coastlines, Hawaii, and Guam,” NASA reports. The National Oceanic and Atmospheric Administration (NOAA) has reported more than 600 floods in 2019. The new research expects three to four times the 2019 flooding levels by the 2030s. 

What is a wobbling moon?

A moon wobble is a shift in the moon’s orbit that was first discovered in 1728. And happens in a cycle of every 18.6-years. This fluctuation in the Moon’s gravitational pull can either subdue or amplify tides on Earth.  The wobbling moon affects gravity felt on Earth which is the main cause of the Earth’s tides. There can be devastating consequences when the wobbling moon is combined with rising sea levels caused by the planet’s warming in a cycle that already amplifies tides. “In half of the Moon’s 18.6-year cycle, Earth’s regular daily tides are suppressed: High tides are lower than normal, and low tides are higher than normal,” NASA explains. “In the other half of the cycle, tides are amplified: High tides get higher, and low tides get lower. Global sea-level rise pushes high tides in only one direction – higher. So half of the 18.6-year lunar cycle counteracts the effect of sea-level rise on high tides, and the other half increases the effect,” the study claims. The moon is not in a tide-amplifying cycle in 2021. So there is no danger of record-breaking flooding, right now. But researchers are warning that the moon will return to its tide-amplifying cycle in the mid-2030s. That’s when worldwide sea levels rise for another 10 years. 

What to expect

All coastal cities in the U.S. will see increasing high tide flooding in the 2030s thanks to a “wobble” in the moon’s orbit coupled with rising sea levels caused by climate change, according to the NASA report.  “In the other half of the cycle, tides are amplified: High tides get higher, and low tides get lower. Global sea-level rise pushes high tides in only one direction — higher. So half of the 18.6-year lunar cycle counteracts the effect of sea-level rise on high tides, and the other half increases the effect,” the space agency study predicts.  “Only far northern coastlines, including Alaska’s, will be spared for another decade or longer because these land areas are rising due to long-term geological processes,” NASA said. 
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Jackie Allen
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Jackie Allen

Jackie is a freelance journalist and technology geek. She worked as a telecom project director for AT&T and BellSouth. Before joining the USA Herald she has written books, articles, blogs and whitepapers. Her clients include Samsung and other technology companies.

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