Philly Braces! Severe Storms & Flooding Threaten Region TODAY!
The Philadelphia region is under a severe thunderstorm warning as of Wednesday, August 13, 2025, with the potential for downpours and localized flooding. The NBC10 First Alert Weather Team has been closely monitoring the situation, indicating that storms could pop up as early as the afternoon, with the most significant activity expected between 4 p.m. and 10 p.m.
A flood watch has been issued for the area due to the possibility of heavy rainfall, which could lead to flooding. These storms are predicted to be slow-moving, increasing the risk of prolonged heavy rain in specific locations. Gusty winds are also a concern. Commuters should anticipate potential delays during the afternoon rush hour.
While Thursday may see some scattered storms, the intensity and coverage are expected to be significantly less than Wednesday's weather event.
Counties Under Severe Thunderstorm Warning
The National Weather Service in Mount Holly issued a severe thunderstorm warning at 4:49 p.m. EDT, affecting several counties, including:
- Hunterdon County, NJ
- Somerset County, NJ
- Warren County, NJ
- Bucks County, PA
- Lehigh County, PA
- Northampton County, PA
Meteorologists are warning of winds as strong as 60 mph and hail up to 0.75 inches in diameter. Residents are advised to take precautions, including seeking shelter in an interior room on the lowest floor of a building. Driving through flooded roadways is strongly discouraged.
Staying Safe During Thunderstorms
Remember these safety tips during thunderstorms:
- Stay indoors, away from windows.
- Avoid contact with electrical equipment and plumbing.
- Keep a battery-powered weather radio for updates.
The flash-flood watch remains in effect until 1 a.m. Thursday. The National Weather Service warns that rainfall of 1 to 3 inches per hour is possible, with isolated areas potentially receiving up to 6 inches. The watch area extends along the I-95 corridor from the Washington area to northern New Jersey.