The Philadelphia region is under a flash flood watch from 2 p.m. Monday to 2 a.m. Tuesday due to anticipated heavy rainfall. Up to 5 inches of localized rain is possible as storms approach. The slow-moving cold front responsible is expected to stall, increasing the risk of flash flooding. The muggy conditions are attributed to slow atmospheric movement and high moisture levels, making accurate storm prediction challenging. Showers are anticipated to continue throughout the week.

Prepared by Olivia Bennett and reviewed by editorial team.