El Niño developing, NOAA monitors Kelvin waves; U.S. West Coast flood risk elevated

El Niño conditions are developing alongside warmer waters off the U.S. western coast, with NOAA tracking Kelvin waves that could further warm the ocean in coming weeks. This raises the risk of coastal flooding and sea-level anomalies for western U.S. states. The development is early-stage, and the magnitude and timing of impacts remain uncertain.