The storm poses a risk of localized flooding, particularly in areas with poor drainage or near foothills. Coastal cities from San Diego south to the border are expected to experience the heaviest rainfall. Trick-or-treaters and Halloween event attendees should prepare for wet conditions. While winds are forecast to be mild, isolated thunderstorms could bring sudden gusts, potentially impacting outdoor activities. The storm may also push San Diego's October rainfall totals above 2 inches, significantly higher than the monthly average of 0.5 inches.