Flash flooding is either ongoing or expected to begin shortly in the warned areas. This could result in flooding of small creeks, streams, urban areas, highways, streets, and underpasses. Low-lying areas and drainage systems are particularly vulnerable. Residents in Philadelphia, Bensalem, Florence, and other nearby locations should remain alert. Driving conditions may become hazardous, and most flood-related fatalities occur in vehicles. Travelers on major highways like Interstate 95 and the Pennsylvania Turnpike should exercise caution.