El Nino-Driven Kelvin Wave Raises Flood Risks Along US West Coast
El Nino-Driven Kelvin Wave Raises Flood Risks Along US West Coast
US · Published Oct 3, 2026
• A significant Kelvin wave, a phenomenon associated with the El Nino weather pattern, is causing sea levels to rise by up to 30 cm along the US West Coast.
• This wave, originating near Indonesia, is a bulge of excess water travelling along the coastline, expected to reach San Diego within a week.

Impact & Risks

The rising sea levels pose a heightened flood risk for coastal communities along the US West Coast, particularly in Southern California. Recent storm surges have already caused significant damage, including uninhabitable homes and beach erosion. The combination of the Kelvin wave with other natural phenomena, such as high tides and tropical cyclones, could exacerbate these impacts. Coastal infrastructure and properties remain vulnerable, with potential for further damage in the coming days.

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