Excessive rainfall could lead to flash flooding as showers and thunderstorms move across the Lehigh Valley, eastern Pennsylvania and part of New Jersey on Monday afternoon and night.
The entire region is under a flood watch from 2 p.m. Monday through 2 a.m. Tuesday, according to the National Weather Service. There is a moderate risk of excessive rainfall that could lead to flash flooding, the weather service warns.
There is a Moderate Risk (3/4) of excessive rainfall leading to flash flooding beginning this afternoon into tonight. Numerous flash floods can be anticipated across portions of the region due to scattered thunderstorms producing heavy rainfall. #PAwx #NJwx #DEwx #MDwx pic.twitter.com/5wvkkRGqsk
— NWS Mount Holly (@NWS_MountHolly) July 14, 2025
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Counties in the NWS flood watch are: Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and Northampton in Pennsylvania and Hunterdon, Mercer, Middlesex, Morris, Somerset and Warren in New Jersey.
“Numerous flash floods can be anticipated across portions of the region due to scattered thunderstorms producing heavy rainfall,” the weather service’s Mount Holly, New Jersey, forecast office posted on X.
Scattered showers and thunderstorms are expected to develop by early Monday afternoon. Storms could produce rainfall rates exceeding 2 inches per hour, which could easily lead to flash flooding, according to the weather service.
Total rainfall amounts of 3-5 inches are possible in some areas, according to the weather service.
Excessive runoff from the storms could result in flooding of rivers, creeks, streams and other low-lying and poor drainage areas, according to the flood watch.
While the main threat from Monday’s storms will be flooding, “a few isolated severe thunderstorms with damaging winds are possible,” the weather service said.
Here is the extended forecast:
Tuesday: A chance of showers before 11 a.m., then a chance of showers and thunderstorms between 11 a.m. and 2 p.m., then showers likely and possibly a thunderstorm after 2 p.m. Patchy fog before 9 a.m. Otherwise, mostly cloudy, with a high near 87. North wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night: Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8 p.m. and 11 p.m., then a slight chance of showers after 11pm. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 2 p.m. Mostly cloudy, with a high near 88. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night: Showers likely and possibly a thunderstorm before 8 p.m., then a chance of showers and thunderstorms, mainly between 8 p.m. and 2 a.m. Mostly cloudy, with a low around 73. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday: Showers likely and possibly a thunderstorm, mainly after 2 p.m. Mostly cloudy, with a high near 91. Chance of precipitation is 70%.
Thursday night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8 p.m. and 2 a.m. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Friday: Showers likely and possibly a thunderstorm after 2 p.m. Partly sunny, with a high near 91. Chance of precipitation is 60%.
Friday night: Showers likely and possibly a thunderstorm before 8 p.m. Partly cloudy, with a low around 70. Chance of precipitation is 60%.
Saturday: A chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
This is a developing story. Check back for updates.
Source: Berkshire mont
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