* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Portions of northern Delaware, including the following area, New Castle, New Jersey, including the following areas, Camden, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington and Western Monmouth, and southeast Pennsylvania, including the following areas, Delaware, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks and Western Montgomery. * WHEN...From late tonight through Sunday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Showers and thunderstorms will develop this evening, and then will become more widespread late tonight and into Sunday morning. Some of these showers and thunderstorms will be capable of heavy rainfall, with as much as 1 to 2 inches of rain possible in the strongest storms in a short window of time. - http://www.weather.gov/safety/flood
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
AI Weather Forecast · Saturday, September 12, 2026
7 AM – 6 PM
Mostly sunny. High near 79, with temperatures falling to around 77 in the afternoon. Southeast wind 2 to 9 mph.
6 PM – 6 AM
A chance of rain showers between 10pm and midnight, then a chance of showers and thunderstorms between midnight and 1am, then showers and thunderstorms likely between 1am and 2am, then patchy fog and showers and thunderstorms between 2am and 5am, then patchy fog and showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 67, with temperatures rising to around 69 overnight. Southeast wind 3 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.