The U.S. West Coast is experiencing elevated sea levels and warmer ocean temperatures due to Kelvin waves and marine heatwaves. While Kelvin waves alone are not a direct threat to coastal communities, their temporary sea level rise of 6–12 inches can exacerbate the impacts of high tides and storm surges. Additionally, these waves suppress the upwelling of cold, nutrient-rich water, which can reduce phytoplankton growth, potentially disrupting the marine food web. The combination of El Niño and marine heatwaves may lead to prolonged ecological and economic impacts on fisheries and coastal ecosystems.