Kelvin Wave 2026 is moving toward California and could raise sea levels along the coast by up to a foot for months. Scientists say the wave may reach California shores within days, with the added water lining up with higher tides and storm-driven flooding.
Severine Fournier, a research scientist studying ocean circulation at NASA’s Jet Propulsion Laboratory, said, "You can follow them along … we see the higher sea levels along the equator, and when the wave reaches the coast of South America, it cannot continue to go eastward". She added: "So it goes north and south."
California and South America
The wave hit the northern tip of South America in late August and is now moving toward the west coast of the US. Fournier said the wave can be tracked as it moves along the equator before splitting north and south at South America, where it cannot keep heading east.
Nate Mantua, a research scientist at the National Oceanic and Atmospheric Administration’s Southwest Fisheries Science Center, said, "When the wind stops blowing or weakens, the force that’s holding that pile of water in place goes away, so that water surges or sloshes back towards California," He also said, "We can predict a lot of the impacts, but not all."
Mike Jacox and Thanksgiving and Christmas
Mike Jacox, a research oceanographer at the Southwest Fisheries Science Center, said, "This winter, we’re supposed to have some really high tides around Thanksgiving and Christmas. If you also have more storms, then you have storm surge. It’s just like you’re raising the floor on all that stuff that happens." He also said, "It’s a wave unlike the ones you’re used to at the beach. They don’t crash, you can’t really seem them come by,"
The threat sits on top of a coast that has already seen sea levels rise about 8 inches over the last century. Scientists said this year’s El Niño is likely to be the largest in at least 1,000 years, and they expect the Kelvin wave’s influence to linger through the winter and into early next year.
El Niño and California
The wave itself is a natural phenomenon that has happened for thousands of years, and the National Oceanic and Atmospheric Administration has measured Kelvin waves since record-keeping began. What changes now is the baseline: higher sea levels and an El Niño that is continuing to develop in the Pacific make the same ocean pattern more costly along California’s coast.
For California, the practical issue is timing. The wave is expected within days, the highest tides are due around Thanksgiving and Christmas, and the added water could stack onto storms, storm surge, flooding and coastal erosion before the season eases.
