* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern New Jersey, including the following county, Morris. * WHEN...From noon EDT today through late tonight. * IMPACTS...Flooding may occur in poor drainage and urban areas. Creeks and streams may rise out of their banks. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Multiple rounds of showers and thunderstorms are expected across the area this afternoon through this evening. Rainfall rates of 1 to 3 inches per hour are possible. Rainfall amounts of 1 to 2 inches are possible with localized amounts of 3 to 5 inches which could cause 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 · Thursday, August 20, 2026
7 AM – 6 PM
Showers and thunderstorms after noon. Partly sunny. High near 83, with temperatures falling to around 76 in the afternoon. North wind 2 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
6 PM – 6 AM
Showers and thunderstorms before 1am, then patchy fog between 3am and 5am. Mostly cloudy. Low around 62, with temperatures rising to around 64 overnight. North wind 3 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.