Pacific Coast Braces for Rising Tides as Warm Water Pulses Threaten Erosion and Flooding

Warm water pulses hit Pacific coast, raising fears of erosion and flooding. Experts warn of increased risks during El Niño season.

Editorial Desk

October 3, 2026 One Min Read

POLICY WIRE — Seattle, United States — Sea levels along the West Coast are expected to rise by up to a foot this month as pulses of warm water known as Kelvin waves move north, sparking concerns about beach erosion and flooding in areas already affected by climate change and El Niño.

Kelvin waves, which are common during El Niño events, are not like tsunamis but rather bulges of water that lift the sea level as they travel along the coast. This year’s super El Niño could intensify their impact, with the 6-inch to foot-tall surge moving north at about 6 miles per hour, affecting Oregon and Washington state over the next few months.

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Experts say the higher sea levels combined with larger than average waves from North Pacific swell and large spring tides from October to February could cause exceptional erosion on the West Coast. Coastal communities, already grappling with rising sea levels, are preparing for potential damage as more waves arrive over the winter.

Reporting by Policy-Wire (PW)

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