Sep 5, 2026
Ocean indicators NOAA scientists are tracking for El Niño’s arrival on the West Coast
NOAA Headquarters
Coastally-trapped Kelvin waves, a signature of El Niño, traveled north along the West Coast during the 1997/1998 El Niño, as shown in a map of sea surface height anomalies. In a graphic provided by NC State's Dillon Amaya, darker reds show sea levels higher than normal, while darker blues show heights below normal. Scientists are now watching for similar waves to move up the West Coast this fall.