El Niño Raises Pacific Sea Levels, Threatens Coastal Flooding
El Niño Raises Pacific Sea Levels, Threatens Coastal Flooding
US · Published Oct 19, 2026
• El Niño is significantly increasing sea levels in the eastern Pacific, with some areas already experiencing a rise of up to 40 cm (15.7 inches) above normal, according to New Scientist (published October 19, 2026).
• This phenomenon is expected to intensify in the coming months, potentially leading to severe coastal flooding and erosion from Alaska to Chile.

Impact & Risks

The rising sea levels pose a significant threat to coastal regions along the eastern Pacific, from Alaska to Chile. Areas near the equator, such as the Galapagos Islands, could see sea levels rise by 24 to 40 cm (9.4 to 15.7 inches), while mainland regions like Peru and Ecuador may experience increases of 19 to 33 cm (7.5 to 13 inches). In California, sea levels are expected to rise by 9 to 13 cm (3.5 to 5.1 inches), with additional risks from high tides and storm surges. These conditions could lead to severe coastal flooding, erosion, and infrastructure damage, particularly during peak travel periods like Thanksgiving and Christmas. The combination of high tides, storm surges, and massive waves could result in flooding and erosion that surpass historical records.

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