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Sea level rise is reshaping a California beach town and threatening a key rail line

Officials say 3 million cubic yards of sand are needed as repeated closures and bluff damage threaten the rail corridor.

  • A massive pulse of warm water called a Kelvin wave is expected to reach Southern California by early October, temporarily lifting sea levels by 5 to 10 inches as El Niño strengthens.
  • Weakening trade winds trigger this phenomenon, releasing warm water that travels eastward across the Pacific Ocean before moving north along the coastline as a coastally trapped wave.
  • Scientists warn this elevated baseline makes low-lying areas vulnerable to flooding, especially when coinciding with high tides, storm surges, and significant erosion already affecting the coastline.
  • California Governor Gavin Newsom declared a state of emergency to prepare for winter storms, while California Coastal Commission Executive Director Kate Huckelbridge urged residents to inspect vulnerable property.
  • The Climate Prediction Center forecasts a 90% chance of a very strong El Niño event through winter, as researchers expect the wave's influence to persist into early next year.
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A pulse of warm water hitting the Pacific coast could mean erosion and flooding

Sea levels along the West Coast will begin to rise by up to a foot this month as a series of pulses of warm water called Kelvin waves hit the shoreline and move north, sparking concerns about beach erosion and…

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The Kelvin wave flows thousands of kilometres along the Pacific coast of the American continent. This wave causes a significant rise in sea level, leading to flooding and beach erosion. - A giant ocean wave will increase sea level on the American west coast (Environment) by 30 cm.

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NBC LA broke the news in Los Angeles, United States on Saturday, September 26, 2026.
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