The flood advisory primarily affects residents and travelers in Los Angeles and Ventura counties, particularly those in low-lying areas and regions prone to poor drainage. Risks include minor flooding, water-covered roadways, and potential rock and mudslides in canyon areas. Debris flows may also occur, posing additional hazards. Motorists are at significant risk, as most flood-related fatalities happen in vehicles. Campers and hikers near streams or creeks are advised to avoid these areas due to the potential for sudden water level rises. While the advisory does not indicate severe flooding, it warns of possible inconvenience and localized hazards.