El Niño's impacts could be severe for California residents, particularly in areas prone to flooding, landslides, and coastal erosion. Urban areas may see overwhelmed drainage systems, while steep terrains and burn scars are at heightened risk for mudslides and debris flows. Coastal communities could face significant erosion and flooding during high tides. In the Sierra Nevada, heavy snowpack could lead to increased spring runoff, potentially affecting water management systems. These risks underscore the need for heightened awareness and preparedness.