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AI Overview
No, king tides and Kelvin waves do not cause widespread damage all over the world simultaneously; instead, their impacts are regional and localized rather than global.
What Are They?
- King Tides: These are naturally occurring, predictable extreme high tides driven by the gravitational alignment of the Earth, Moon, and Sun (often when the Moon is closest to Earth). While king tides happen in low-lying coastal areas worldwide, they only cause minor nuisance flooding unless they coincide with storms or high background sea levels.
- Kelvin Waves: These are slow-moving, warm-water ocean swells that originate in the western equatorial Pacific and travel east toward the Americas (often amplified by El Niño conditions). As they hit the West Coast of North and South America, they become "coastally trapped waves" that temporarily raise local sea levels by several inches to over a foot.
Where Do They Cause Damage?
- Regional Concentration: Kelvin waves specifically impact the Pacific rim—particularly the West Coast of the United States and parts of Central and South America—where they pile warm water against the shoreline.
- Compounding Factors: Damage (such as beach erosion, road flooding, and damaged coastal infrastructure) usually happens only when a Kelvin wave overlaps with seasonal king tides, ongoing sea-level rise from climate change, and winter storm surges. For instance, recent stacking of these factors produced record-high water levels in spots like Southern California (such as measurements at the San Pedro tide gauge), but they do not batter every coastline on Earth at the same time.
If you are tracking a specific coastline, let me know which region or state you are asking about so I can share local tidal forecasts and flood risks.
3 days ago — The highest tides of the year so far are causing problems along the California coast, producing coastal flooding advisories and warnings ...
4 days ago — An ongoing Kelvin wave is due to El Niño conditions and weakening Pacific trade winds. This allows for more warm water to move across the ...
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5 days ago — These factors on their own can and do cause coastal flooding, especially during a peak Kelvin wave or peak king tides. Together, they make a ...
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Oct 20, 2026 — Scientists say the Kelvin wave raised background sea levels, worsening the effects of high tides and hurricane-generated surf rather than ...
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