The anticipated record-wet winter could lead to severe flooding, particularly in Southern and Central California. Historical data shows that California has experienced catastrophic floods every 200 to 400 years, with the last major event occurring in 1861-62. Climate change has doubled the risk of such megastorms and tripled the likelihood of a trillion-dollar megaflood. Coastal areas are especially vulnerable, with record-high sea levels already causing damage during recent hurricanes. Upcoming king tides in November, December, and January are expected to exacerbate the risk of coastal flooding, even during calm weather. The combination of heavy rainfall, high sea levels, and king tides could result in widespread damage, particularly in under-resourced communities.