The anticipated heavy rainfall and coastal flooding could lead to widespread damage in California. Historical data shows that strong El Niño events have caused significant flooding in the past, with risks now heightened by climate change. Coastal areas are particularly vulnerable, with record-high sea levels already observed. The risk of flash flooding, damaging winds, and isolated tornadoes is also elevated. A study co-authored by Swain suggests a 10% chance of a megastorm causing over $10 billion in damages this winter. Vulnerable populations, including those in low-lying areas, face disproportionate risks from flooding and infrastructure damage.