Isolated severe storms with locally heavy rain are possible Thursday in the Lehigh Valley.
There is potential for severe storms and flash flooding between 3 and 10 p.m., according to the National Weather Service in Mount Holly, New Jersey. Forecasters said the primary threat from storms would be damaging winds that could cause tree damage and power outages.
The entire region is at a marginal risk of severe thunderstorms and isolated flash flooding. There is also the possibility of a brief tornado Thursday.
Forecasters said between half an inch to an inch of rain could fall, but some areas could get up to 3 inches of localized rain.
A cold front should move the showers and storms out of the area by Friday morning. The rest of the day should be cloudy, with a high of 80 expected. Scattered storms are possible again Saturday and Sunday.
Several rounds of showers and a few thunderstorms will continue to impact the region through Thursday night. Some isolated severe thunderstorms and flash flooding are possible Thursday evening. A brief tornado cannot be ruled out. #PAwx #NJwx #DEwx #MDwx pic.twitter.com/dFcTJXUuwR
— NWS Mount Holly (@NWS_MountHolly) September 24, 2025
The expected rainfall comes during a somewhat dry period for the Lehigh Valley. As of Wednesday, 2.36 inches of rain has fallen so far this month, which is roughly 1.4 inches below normal for this time of year, according to weather service data. Most of that rain fell on a single day in the beginning of the month. About a quarter of an inch of rain fell between Tuesday and Wednesday.
Next week should be sunny with highs in the 70s. Here is the extended forecast from the National Weather Service:
Friday: Patchy fog before 8 a.m. Otherwise, partly sunny, with a high near 80. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday: A slight chance of showers after 2 p.m. Mostly cloudy, with a high near 77. Calm wind becoming northeast around 5 mph. Chance of precipitation is 20%.
Sunday: A chance of showers. Mostly cloudy, with a high near 77. Chance of precipitation is 30%.
Monday: Mostly cloudy, with a high near 79.
Tuesday: Mostly sunny, with a high near 78.
Wednesday: Sunny, with a high near 72.
