* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of northern Delaware, including the following area, New Castle, New Jersey, including the following areas, Camden, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset and Western Monmouth, and southeast Pennsylvania, including the following areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester and Western Montgomery. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Showers and thunderstorms will increase today into tonight, with the most widespread activity occurring this afternoon and this evening. Some heavy showers and thunderstorms will produce torrential rainfall, with 2 to 3 inches of rain per hour possible. The excessive rainfall within a short period of time, especially in urban areas, could lead to flash flooding. - http://www.weather.gov/safety/flood
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
AI Weather Forecast · Tuesday, July 21, 2026
7 AM – 6 PM
A slight chance of showers and thunderstorms before 8am, then showers and thunderstorms between 8am and 2pm, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. High near 82, with temperatures falling to around 79 in the afternoon. South wind 5 to 12 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
6 PM – 6 AM
Showers and thunderstorms before midnight, then showers and thunderstorms likely between midnight and 1am, then a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy. Low around 69, with temperatures rising to around 72 overnight. South wind around 8 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.