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Weather Service Issues Flash Flood Watch

Heavy, slow moving pockets of rainfall could produce flooding of small streams and poor drainage areas.

 

The National Weather Service in Mount Holly issued a flash flood watch this morning for the Philadelphia area including Bucks and Montgomery counties.

According to the weather service, tropical rains threaten to produce pockets of flash flooding at times into Wednesday evening.

The watch indicated that a warm front across the upper DelMarVa area will be slowly lifting north today as low pressure moves from the Ohio Valley toward New York state. The low should trail a weak cool front southward into the Delaware Valley on Wednesday. Pockets of short duration excessive rains are probable in this pattern especially since the bands of showers and embedded thunderstorms will be moving very slowly.

General rainfall of 2-4 inches is expected through Wednesday in the I-95 corridor from near Trenton through the Philadelphia metro area into northern Delaware.

The primary flood threat is for small streams and poor drainage areas. Bands of heavy showers with embedded thunderstorms can easily produce 1-2 inches of rain in an hour’s time. If a band of heavy showers lingers, excessive rainfall would result in flooding.

Here’s the local forecast:

  • Today: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 3pm. Some of the storms could produce heavy rain. Cloudy, with a high near 84. Southwest wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Tonight: Showers and possibly a thunderstorm. Some of the storms could produce heavy rain. Low around 73. South wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 85. Southwest wind 8 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
  • Wednesday Night: A chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 70. Southwest wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
  • Thursday: A slight chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind around 6 mph. Chance of precipitation is 20%.

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