Officials are warning of significant flash flooding risks as heavy rains sweep across the East Coast, affecting millions. The Philadelphia region is under a Flood Watch, with urgent alerts issued for torrential rain and damaging winds. Glen Mawr has been evacuated, and multiple roads in Pennsylvania have been closed due to severe flooding and mudslides. Flash Flood Warnings are in place for several counties, including Somerset, York, and Bucks. Residents are being urged to take precautions as dangerous conditions persist, particularly along the I-95 corridor, where the flooding threat is deemed critical.