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July 28, 2016

'Severe' thunderstorm watch now in effect for Philadelphia, region until midnight

Weekend forecast includes cooler temperatures but chances of rain each day

Short but heavy rainstorms passed through Philadelphia and most of the surrounding area Thursday afternoon, but that was just the first wave from a weather system expected to impact the region Thursday night and into Friday morning.

The National Weather Service's office in Mt. Holly, New Jersey, has issued a severe thunderstorm watch for Philadelphia, Delaware, Chester, Montgomery and Berks counties in Pennsylvania. The watch remains in effect until midnight Friday.

  • Weekend Forecast from NWS
  • Thursday night: Showers and thunderstorms, mainly before 9 p.m. Some storms could be severe, with damaging winds, heavy rain, and frequent lightning. 80% chance of rain. Low temperature about 72.
  • Friday: Showers and thunderstorms likely before 1 p.m. Mostly cloudy, high near 84. Chance of precipitation is 70%. Patchy fog after 3 a.m. Overnight low around 67.
  • Saturday: Patchy fog before 7 a.m.; 50% chance of rain, with thunderstorms possible after noon. Then partly sunny, high near 84. Chance of rain is 60% late, and overnight low around 69.
  • Sunday: Showers and thunderstorms, chance 50%. Cloudy, high near 82. Just a 30% chance of showers and thunderstorms before 10 p.m. Overnight low around 69.

A similar storm watch has been issued in New Jersey for all South Jersey and Jersey Shore counties. 

At about 2:15 p.m. Thursday, the National Weather Service's office in Mt. Holly, New Jersey, had issued a severe thunderstorm warning for Philadelphia; portions of Delaware County in Pennsylvania; and portions of Camden, Burlington and Gloucester counties in South Jersey.

NWS meteorologists forecast "torrential" rain, impacting much of the region that may lead to flash flooding.

In addition to the NWS's severe thunder storm watch, a flash flood watch is in effect until Friday morning in northern Delaware; South Jersey and the Jersey Shore; and Chester, Delaware, Bucks, Montgomery, Berks and Philadelphia counties in Pennsylvania.

The rain will end a string of 90-plus-degree days across the Delaware Valley. Friday's high temperature is expected to be near 84 degrees.