The combination of El Niño, high tides, and rising sea levels poses significant risks to both coastal and inland areas in Southern California. Coastal flooding is expected to be severe, while inland regions near rivers and creeks may experience flash flooding. Past El Niño events, such as those in 1982 and 1997, caused billions in damages and numerous fatalities. This year's event could surpass those in intensity, with experts urging residents to prepare for potential flooding and infrastructure strain.