Stormy weather expected over the next 3 days.

Three days of stormy weather is expected to hit Eastern Pennsylvania beginning Thursday night and going through Saturday. Gusty thunderstorms and drenching downpours are expected on Friday and Saturday, according to forecasters.

The National Weather Service has issued a hazardous weather outlook for the region, saying showers and thunderstorms may produce locally heavy rainfall Thursday night. There is also the potential for heavy rainfall Friday afternoon through Saturday morning.

The rainstorm is unusual because it will come with steady rain for 12 hours or more in many locations. Typically in the summer, rainfall is limited to a few hours unless there’s a tropical storm.

Tonight: A chance of showers and thunderstorms, mainly between 9pm and 5am. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.

Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 83. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. Low around 66. East wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Saturday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. High near 75. Northeast wind around 14 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Saturday Night: Showers likely and possibly a thunderstorm before 9pm, then a chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday: Mostly sunny, with a high near 79.

Sunday Night: Mostly clear, with a low around 63.

Monday: Sunny, with a high near 83.

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