Severe · Flash Flood WarningThis alert has expired. It is kept for reference.

Flash Flood Warning issued September 13 at 9:37AM EDT until September 13

Affecting Mercer, NJ; Middlesex, NJ; Bucks, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA

In effect until: Sep 13, 2026, 4:00 PM

Mercer, NJ; Middlesex, NJ; Bucks, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA

Likely impact across 6 counties in NJ and PA; effects through 4:00 PM.

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.

Affected areas

Philadelphia

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Read the original bulletin (official text)

At 937 AM EDT, emergency management and PennDOT reported flash
flooding. Several road closures have been reported in portions of
Delaware, Philadelphia and Bucks counties due to flooding. Small
creeks are running high in Delaware and Philadelphia counties,
however are receding. Between 1 and 2.5 inches of rain have fallen.
The heaviest rain continues to end from west to east across the
warned area. The expected rainfall rate is 0.25 to 1 inch in 1 hour.
Flash flooding is already occurring.

HAZARD...Life threatening flash flooding. Heavy rain producing flash
flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams, urban
areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
Philadelphia, Trenton, Bensalem, Ewing, Chester, Princeton, Yeadon,
Folcroft, Swarthmore, Hightstown and Jenkintown.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Flash Flood Warning issued September 13 at 9:37AM EDT until September 13

Affected areas

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