Scattered storms that could cause heavy rain and flash flooding are possible Thursday in the Lehigh Valley.
All of Northampton County and most of Lehigh County are at a slight risk of excessive flooding, while a portion of western Lehigh County is under a slight risk, according to the National Weather Service in Mount Holly, New Jersey.
The greatest risk of flooding is in urban areas and areas with poor drainage, according to forecasters. Places that experienced heavy rainfall this week could also be at risk.
The storms could come between 1 and 9 p.m.
Additionally, there is a threat of damaging winds. Most of Lehigh County and a small portion of southern Northampton County are at a marginal risk of severe storms. The rest of the Lehigh Valley will likely not get severe storms, the weather service said.
South and west of the region have a higher likelihood of severe weather. Nearby Berks and Montgomery counties, as well as central Bucks County, will be under a flood watch from noon until midnight.
There is a chance of rain again Friday and Saturday. Here is the extended forecast from the National Weather Service:
Friday: A chance of showers and thunderstorms before 3 p.m., then a slight chance of thunderstorms after 5 p.m. Increasing clouds, with a high near 86. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 40%. New rainfall amounts of less than a 10th of an inch, except higher amounts possible in thunderstorms.
Saturday: A slight chance of showers and thunderstorms after 2 p.m. Partly sunny, with a high near 83. Calm wind becoming northeast around 5 mph. Chance of precipitation is 20%.
Sunday: Sunny, with a high near 83.
Monday: Sunny, with a high near 85.
Tuesday: Sunny, with a high near 90.
Wednesday: Mostly sunny, with a high near 92.