A Kelvin wave, a deep oceanic phenomenon connected to the current El Niño pattern, has reached the U.S. West Coast and is causing elevated sea levels across the region. The wave stretches thousands of miles and moves beneath the ocean’s surface, originating from unusually warm waters in the Pacific. Scientists describe it as a planetary-scale phenomenon distinct from visible storm waves or tsunamis that would crash onto shorelines.
The Kelvin wave develops during El Niño years when a vast region of Pacific Ocean water becomes warmer than normal. The warm water gradually moves eastward beneath the surface until reaching South America, then splits into two paths—one traveling north along the West Coast toward California and another extending south toward Chile. The phenomenon has drawn increased public attention this year, with educational videos about Kelvin waves gaining significant engagement on social media platforms.
Currently, the Kelvin wave is raising sea levels along the West Coast by approximately six to eight inches. While the wave itself does not directly cause flooding, it creates conditions that increase flooding vulnerability by elevating baseline sea levels. Coastal communities face greater risks when other factors align, such as major storms or exceptionally high tides. Southern California experienced such a combination in early October when Tropical Storm Rachel struck during a period of elevated sea levels, resulting in flooding and property damage that scientists attribute partly to the Kelvin wave’s presence.
The wave also brings warmer water northward along the coast, disrupting marine ecosystems. Researchers have documented unusual marine activity, including tropical fish species appearing in atypical locations and marine birds dying in response to temperature changes. The warmer water pushes down nutrient-rich cold currents that normally support productive ocean ecosystems. Additional Kelvin waves are expected to reach the West Coast through late October and into early 2027, as multiple waves typically occur during strong El Niño years. The current El Niño pattern is forecast to remain strong through early 2027.
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