* WHAT...Flash 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, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Salem, 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...From 2 PM EDT this afternoon through late tonight. * IMPACTS...Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Showers and thunderstorms with rainfall rates potentially of 1-2 inches per hour are expected across the watch area. In urban locations, this will be enough to trigger 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 · Monday, June 22, 2026
7 AM – 6 PM
A chance of rain showers between 8am and 11am, then showers and thunderstorms. Some of the storms could be severe and produce heavy rain. Cloudy. High near 75, with temperatures falling to around 69 in the afternoon. East wind 5 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
6 PM – 6 AM
Showers and thunderstorms. Some of the storms could be severe and produce heavy rain. Cloudy. Low around 64, with temperatures rising to around 66 overnight. Southeast wind 1 to 12 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.