San Diego County residents should prepare for a wetter-than-average winter, with frequent atmospheric river events expected to bring heavy rainfall. These concentrated corridors of water vapor can overwhelm drainage systems, leading to localized flooding, water damage to homes, and potential mold issues. Property owners in flood-prone areas should be particularly vigilant, as the increased precipitation could exacerbate existing vulnerabilities. The risk of water intrusion into buildings is heightened, especially for structures with inadequate drainage systems or poor yard grading. (Source: NOAA Climate Prediction Center, FEMA FloodSmart, City of San Diego)