Philadelphia is under a Severe Thunderstorm Warning issued by the National Weather Service, effective until 11:30 p.m. Monday. Residents are urged to prepare for strong winds and heavy rain, with potential wind gusts reaching up to 50 mph and rainfall accumulation between 1 to 1.5 inches. Earlier, a Tornado Watch was in effect but was lifted by 6 p.m. However, a Tornado Warning remains for Kent County, Delaware, indicating a localized threat of severe weather. The heavy precipitation raises concerns about localized flooding, particularly in low-lying areas.