The strongest El Niño on record could bring wetter conditions to the Sierra Nevada and Great Basin, increasing the risk of flooding. Atmospheric rivers carrying warm rain could lead to rapid snowmelt and high water events, similar to the 1997 New Year’s Flood. Urban areas and communities near rivers are particularly vulnerable, with potential economic damages estimated in the billions. Local agencies are working to enhance flood resilience, but residents should remain cautious as forecasts are not guarantees.