Showers and thunderstorms are possible Tuesday afternoon and evening in the Lehigh Valley.
All of Lehigh County and most of Northampton County are at a marginal risk of severe weather, according to the National Weather Service in Mount Holly, New Jersey. Damaging winds would be the main threat, however forecasters said locally heavy rainfall is possible as well.
Additionally, the area is at a marginal risk for excessive rainfall Tuesday into Wednesday morning. Rainfall rates between 1 and 2 inches per hour are possible, and there could be flash flooding in urban areas, creeks and streams, forecasters said.
There is a chance of heavy downpours during the Wednesday morning commute, according to the weather service.
Isolated severe thunderstorms are possible today with damaging wind gusts being the primary threat. The greatest chance for any severe thunderstorms will be in the afternoon and evening hours. pic.twitter.com/rM6OdABo4a
— NWS Mount Holly (@NWS_MountHolly) August 11, 2026
Hot and humid conditions will persist into the middle of the week. There is a slight chance of more rain Thursday. Friday and Saturday should be clear.
Here is the extended forecast from the National Weather Service:
Wednesday: A chance of showers before 8 a.m. Mostly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a 10th of an inch possible.
Thursday: A chance of showers, with thunderstorms also possible after 2 p.m. Partly sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a 10th of an inch, except higher amounts possible in thunderstorms.
Friday: Sunny, with a high near 84.
Saturday: Sunny, with a high near 81.
Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 82. Chance of precipitation is 30%.
Monday: A chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 30%.