The heavy rainfall associated with Hurricane Polo's moisture is expected to impact areas in the Southwest with rocky soils, burn scars, and slot canyons, which are particularly prone to flash flooding. The potential for up to 5 inches (127 mm) of rain could lead to dangerous conditions, including rapid water accumulation in low-lying areas and roadways. Travelers and residents in the region should be cautious of sudden flooding, which can occur with little warning. The risk is heightened in areas recently affected by wildfires, where burn scars reduce the ground's ability to absorb water.