Coastal cities in California, especially those with low-lying areas and developed shorelines, face heightened risks of flooding. The combination of king tides, El Niño, and storm surges could lead to significant damage to infrastructure and natural ecosystems. Vulnerable areas include bays and regions with limited natural barriers like tidal marshes or mangroves, which have been diminished by urban development. Without adequate planning and funding, the state could face severe economic and environmental consequences. Experts emphasize that this winter's events may serve as a wake-up call for long-term sea level rise preparedness.