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Flash Flood Warning Issued for Parts of Pennsylvania and New Jersey

September 13, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Mount Holly, New Jersey, has issued a Flash Flood Warning for several counties in Pennsylvania and New Jersey until 12:00 PM EDT on September 13. Life-threatening flash flooding is currently occurring across the affected region following heavy rainfall.

Emergency management and PennDOT reported flash flooding at 9:37 AM EDT on September 13. The warning applies to Mercer and Middlesex counties in New Jersey, as well as Bucks, Delaware, Montgomery, and Philadelphia counties in Pennsylvania. Locations expected to experience flooding include Philadelphia, Trenton, Bensalem, Ewing, Chester, Princeton, Yeadon, Folcroft, Swarthmore, Hightstown, and Jenkintown.

Several road closures have been reported in portions of Bucks, Delaware, and Philadelphia counties due to the conditions. Small creeks in Delaware and Philadelphia counties are running high, though reports indicate they are beginning to recede.

Between 1 and 2.5 inches of rain have fallen in the area, with an additional expected rainfall rate of 0.25 to 1 inch per hour. The heaviest rainfall is continuing to end from west to east across the warned region.

The alert highlights life-threatening flash flooding affecting creeks, streams, urban areas, highways, streets, and underpasses.

Why it is dangerous and what to do

⚠️ Safety
• Turn around and do not drive on flooded roads, as most flood deaths occur in vehicles.
• Be aware of your surroundings in areas prone to flash flooding.
• Avoid low-lying areas, underpasses, and streams subject to sudden flooding.
📊 The numbers, from wweather1 data
Philadelphia: now +23°, Clear.
That is 5° above the October climate norm.
The record for this date is +29° (1954).
Three-day forecast: 13 October: +24°/+13° · 14 October: +25°/+17° · 15 October: +20°/+13°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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