Southern California could experience above-average rainfall, potentially leading to flooding, mudslides, and coastal erosion. Past strong El Niño events have caused significant damage, including $100 million in coastal destruction in 1982-83 and widespread flooding in 1997-98. Marine ecosystems may also be affected, with warmer waters potentially increasing shark sightings, jellyfish populations, and marine heat waves. These conditions could harm sea life, including kelp forests and seabirds, and exacerbate issues like sea star wasting disease. While the event tilts the odds toward wetter conditions, it does not guarantee heavy rain, and other impacts, such as damaging waves and rip currents, remain possible.