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Ocean's Hidden Giant: Kelvin Wave Arrives
19 Oct
Summary
- Deep ocean Kelvin waves are raising sea levels along the West Coast.
- These waves increase coastal flooding risks and water temperatures.
- The next Kelvin wave is predicted for late October or early November.
A major indicator of this year's 'Super El Niño,' a Kelvin wave, has begun affecting the U.S. West Coast by raising sea levels. This deep ocean wave, first described by Lord Kelvin in the late 1800s, is a planetary-scale phenomenon.
Kelvin waves develop in the Pacific during El Niño years, carrying warm water eastward. While not a visible wave like those from storms, its impact is gradual, increasing sea levels and the risk of coastal flooding. This effect was evident in early October when a Kelvin wave contributed to flooding in Southern California during Tropical Storm Rachel.
Beyond flooding, Kelvin waves bring warmer ocean temperatures, stressing marine life and causing unusual sightings like whale sharks. They can also push down vital cold, nutrient-rich waters. Several more Kelvin waves are expected through fall and early winter, with the El Niño pattern predicted to persist until early 2027.
