Flooding in the Phoenix area has already stranded dozens of motorists, with more heavy rain expected to worsen conditions through Sunday. Low-lying areas, washes, and roadways under overpasses are particularly vulnerable to flooding. The saturated ground increases the likelihood of rapid water accumulation, posing risks to drivers and pedestrians. Emergency officials emphasize that even shallow water can be dangerous, with 6 inches capable of knocking a person off their feet and 12 inches able to carry away vehicles. Residents are advised to avoid travel unless absolutely necessary and to exercise extreme caution near flood-prone areas.