Flash Flooding, Severe Storms Threaten PA

A severe thunderstorm risk with heavy downpours threatens Pennsylvania on Thursday.

The National Weather Service said isolated to scattered severe thunderstorms are possible late Thursday afternoon and evening.

Heavy rain could lead to flash flooding in some areas. This is in addition to the rain that already fell on Thursday morning.

Additionally, parts of South Jersey and Pennsylvania are under a Heat Advisory on Thursday.

The advisory remains in effect from 11 a.m. to 8 p.m. for portions of southeast Pennsylvania and New Jersey, along with the eastern shores of Maryland and Delaware.

The NWS said heat index values are expected to peak in the mid-90s to mid-100s.

The highest heat concern includes the Philadelphia urban corridor and some adjacent areas of southeast Pennsylvania and New Jersey, as well as the eastern shores of Maryland and Delaware.

Here is a look at the weather ahead, including a sneak peek of the forecast for Labor Day weekend:

Thursday: A slight chance of showers and thunderstorms before 4 p.m., then a chance of showers and thunderstorms after 5 p.m. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 91. Heat index values as high as 102. West wind around 5 mph. Chance of precipitation is 30 percent. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: A chance of showers and thunderstorms, mainly between 1 and 2 a.m. Mostly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm. Chance of precipitation is 40 percent. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers and thunderstorms between 2 and 3 p.m., then showers likely and possibly a thunderstorm after 3 p.m. Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 60 percent. New rainfall amounts between a quarter and half of an inch possible.

Friday Night: A chance of showers and thunderstorms before 8 p.m., then a chance of showers between 8 p.m. and 2 a.m. Mostly cloudy, with a low around 68. Northwest wind around 5 mph. Chance of precipitation is 30 percent. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday: Sunny, with a high near 82. North wind 5 to 10 mph.

Saturday Night: Mostly clear, with a low around 62.

Sunday: Sunny, with a high near 79.

Sunday Night: Mostly clear, with a low around 59.

Labor Day: Sunny, with a high near 81.