Flash Flood Warning 150, NWS Philadelphia/Mount Holly

Issued

Sep 1, 2026, 8:44 PM EDT (00:44 UTC)

Expired

Sep 2, 2026, 12:08 AM EDT

In force

3 hr

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Flood severity

None

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA

The Dover AFB radar (KDOX), 120 km from the middle of the area, began a volume at 00:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

809 
WGUS51 KPHI 020044
FFWPHI
DEC003-NJC015-033-PAC029-045-020445-
/O.NEW.KPHI.FF.W.0150.260902T0044Z-260902T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
844 PM EDT Tue Sep 1 2026

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northern New Castle County in northern Delaware...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Salem County in southern New Jersey...
  Chester County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1245 AM EDT.

* At 844 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Between 1 and 2 inches of rain
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour.
  Additional rainfall amounts of 1 to 2 inches are possible in the
  warned area. Flash flooding is ongoing or expected to begin
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Wilmington, Newark, West Chester, Chester, Pennsville, Coatesville,
  Westtown, Pitman, Carneys Point and Downingtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.

&&

LAT...LON 3972 7596 3979 7605 3980 7605 3980 7604
      3983 7604 3983 7602 3985 7602 3985 7601
      3987 7600 3987 7599 3993 7600 3993 7598
      3995 7599 4004 7593 4011 7594 4022 7574
      3974 7510 3948 7561 3960 7578 3972 7579

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

MPS

621 
WGUS71 KPHI 020228
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1028 PM EDT Tue Sep 1 2026

DEC003-NJC015-033-PAC029-045-020445-
/O.CON.KPHI.FF.W.0150.000000T0000Z-260902T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Gloucester NJ-Salem NJ-Chester PA-Delaware PA-
1028 PM EDT Tue Sep 1 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT WEDNESDAY
FOR NORTHERN NEW CASTLE, NORTHWESTERN GLOUCESTER, NORTHWESTERN SALEM,
CHESTER AND DELAWARE COUNTIES...

At 1028 PM EDT, Doppler radar indicated thunderstorms produced heavy
rain across the warned area. Between 2 and 3 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Wilmington, Newark, West Chester, Chester, Pennsville, Coatesville,
  Westtown, Pitman, Carneys Point and Downingtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.

&&

LAT...LON 3972 7596 3979 7605 3980 7605 3980 7604
      3983 7604 3983 7602 3985 7602 3985 7601
      3987 7600 3987 7599 3993 7600 3993 7598
      3995 7599 4004 7593 4011 7594 4022 7574
      3974 7510 3948 7561 3960 7578 3972 7579

FLASH FLOOD...RADAR INDICATED

$$

MPS

085 
WGUS71 KPHI 020408
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1208 AM EDT Wed Sep 2 2026

DEC003-NJC015-033-PAC029-045-020418-
/O.CAN.KPHI.FF.W.0150.000000T0000Z-260902T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Gloucester NJ-Salem NJ-Chester PA-Delaware PA-
1208 AM EDT Wed Sep 2 2026

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN NEW CASTLE,
NORTHWESTERN GLOUCESTER, NORTHWESTERN SALEM, CHESTER AND DELAWARE
COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

&&

LAT...LON 3972 7596 3979 7605 3980 7605 3980 7604
      3983 7604 3983 7602 3985 7602 3985 7601
      3987 7600 3987 7599 3993 7600 3993 7598
      3995 7599 4004 7593 4011 7594 4022 7574
      3974 7510 3948 7561 3960 7578 3972 7579

$$

Staarmann

Flash Flood Warnings in New Jersey, 2026Flash Flood Warnings in Pennsylvania, 2026Flash Flood Warnings in Delaware, 2026Every flash flood warning in 2026

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.