A significant Kelvin wave is making its way toward California, raising alarm bells about the potential impacts on coastal areas. This planetary-scale wave is associated with the ongoing El Niño phenomenon and could exacerbate coastal flooding and beach erosion. Experts, including meteorologists, are educating the public about what a Kelvin wave is and why it matters, emphasizing that this unusual oceanic event could amplify the effects of winter storms and increase baseline sea levels. While surfers in California express disappointment over the un-shreddable nature of the incoming wave, others warn of the risks posed by the interaction between king tides and the Kelvin wave. Overall, the situation has prompted calls for preparedness as the West Coast braces for what lies ahead.