Flash Flood Watch Now in Effect This Morning Through Thursday Morning

floodImage by Dean Moriarty

CHESTER COUNTY, PA — A National Weather Service Flash Flood Watch is in effect from September 1, 08:00 AM until September 2, 08:00 AM in Chester County as the remnants of Hurricane Ida will pass through the region.

Periods of heavy rain and scattered thunderstorms associated with this low will result in widespread rainfall totals of 3 to 6 inches, with locally higher amounts possible. Much of this rainfall may occur in a short period of time, exacerbating the flooding threat. Combined with wet antecedent conditions, this will lead to numerous instances of flash flooding, some of which may be significant.

Flooding of creeks, streams, urban areas, and poor drainage areas is likely in the areas of heaviest rain. Water is likely to cover the roads, especially in low-lying areas. Moderate to major flooding is possible along some main stem rivers, and roads and structures near these rivers may be flooded.

Detailed Forecast

Today: Showers and possibly a thunderstorm. Some storms could be severe, with damaging winds and heavy rain. High near 75. North wind 5 to 10 mph becoming east in the afternoon. The chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Tonight: Showers and possibly a thunderstorm. Some storms could be severe, with damaging winds and heavy rain. Low around 61. East wind 10 to 15 mph becoming north after midnight. The chance of precipitation is 100%. New rainfall amounts between 3 and 4 inches possible.

Thursday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9 am and 11 am. Some of the storms could produce heavy rainfall. Mostly cloudy, then gradually becoming sunny, with a high near 74. North wind around 15 mph, with gusts as high as 25 mph. The chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Mostly clear, with a low around 54. North wind 5 to 10 mph.

Friday: Sunny, with a high near 74. Northwest wind 5 to 10 mph.

Friday Night: Partly cloudy, with a low around 55.

Saturday: Sunny, with a high near 76.

Saturday Night: Partly cloudy, with a low around 61.

Sunday: Partly sunny, with a high near 78.

Sunday Night: A chance of showers between 9 pm and 3 am. Partly cloudy, with a low around 61. The chance of precipitation is 30%.

Labor Day: Sunny, with a high near 79.

Monday Night: Mostly clear, with a low around 61.

Tuesday: Sunny, with a high near 81.

For updated weather information, please visit the MyChesCo Weather Center.

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