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Heavy Rain and Potential for Flash Flooding

Strong to severe thunderstorms are forecast to develop along a frontal system stretching from portions of the Mississippi Valley into the Ohio Valley. These storms may produce heavy rain and flash flooding. The threat shifts east on Friday. Moonsoon moisture will continue to produce heavy rain with the possibility of localized flash flooding in the Four Corners area. Read More >

Current conditions at

Pottstown, Pottstown Limerick Airport (KPTW)

Lat: 40.24°NLon: 75.55°WElev: 288ft.

Partly Cloudy

78°F

26°C

Humidity 82%
Wind Speed Calm
Barometer 29.91 in (1012.4 mb)
Dewpoint 72°F (22°C)
Visibility 7.00 mi
Heat Index80°F (27°C)
Last update 27 Jul 6:54 pm EDT
Extended Forecast for

Harleysville PA

Flash Flood Watch July 28, 02:00pm until July 29, 02:00pm
Click here for hazard details and duration
Flash Flood Watch
  • Tonight

    Tonight: A chance of showers and thunderstorms.  Patchy fog after 1am.  Otherwise, mostly cloudy, with a low around 67. Light and variable wind.  Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Chance
    T-storms then
    Chance
    Showers and
    Patchy Fog

    Low: 67 °F

  • Friday

    Friday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rain.  Patchy fog before 9am. High near 82. Light north wind.  Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Heavy Rain
    and Patchy
    Fog then
    Heavy Rain

    High: 82 °F

  • Friday
    Night

    Friday Night: Rain. The rain could be heavy at times.  Low around 66. Northeast wind 6 to 13 mph.  Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.

    Heavy Rain

    Low: 66 °F

  • Saturday

    Saturday: Rain. The rain could be heavy at times.  High near 69. Northeast wind 13 to 17 mph.  Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Heavy Rain

    High: 69 °F

  • Saturday
    Night

    Saturday Night: A chance of showers.  Mostly cloudy, with a low around 60. Northeast wind 11 to 13 mph.  Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Chance
    Showers

    Low: 60 °F

  • Sunday

    Sunday: A slight chance of showers.  Mostly sunny, with a high near 77. Chance of precipitation is 20%.

    Slight Chance
    Showers

    High: 77 °F

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 60.

    Mostly Clear

    Low: 60 °F

  • Monday

    Monday: Mostly sunny, with a high near 80.

    Mostly Sunny

    High: 80 °F

  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 63.

    Partly Cloudy

    Low: 63 °F

Detailed Forecast

Tonight
A chance of showers and thunderstorms. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 67. Light and variable wind. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rain. Patchy fog before 9am. High near 82. Light north wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Rain. The rain could be heavy at times. Low around 66. Northeast wind 6 to 13 mph. Chance of precipitation is 90%. New precipitation amounts between 1 and 2 inches possible.
Saturday
Rain. The rain could be heavy at times. High near 69. Northeast wind 13 to 17 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 60. Northeast wind 11 to 13 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
A slight chance of showers. Mostly sunny, with a high near 77. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 60.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Mostly sunny, with a high near 86.
Click Map For Forecast
Point Forecast:
Harleysville PA
 40.29°N 75.38°W (Elev. 299 ft)
4:01 pm EDT Jul 27, 2017
7pm EDT Jul 27, 2017-6pm EDT Aug 3, 2017
 
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