Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 152, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 1, 2026, 9:26 PM EDT for Atlantic County, Camden County, Gloucester County, New Jersey. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 1, 2026, 9:26 PM EDT (01:26 UTC)
- Expired
- Sep 1, 2026, 11:21 PM EDT
- In force
- 115 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Atlantic County, NJ, Camden County, NJ, Gloucester County, NJ
The radar
The Philadelphia radar (KDIX), 50 km from the middle of the area, began a volume at 01:29 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.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 1.4 hours before the alert went out and 215 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 353 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 466 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -0.8
The text
As transmitted.
993
WGUS51 KPHI 020126
FFWPHI
NJC001-007-015-020530-
/O.NEW.KPHI.FF.W.0152.260902T0126Z-260902T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
926 PM EDT Tue Sep 1 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Atlantic County in southern New Jersey...
Southeastern Camden County in southern New Jersey...
Southeastern Gloucester County in southern New Jersey...
* Until 130 AM EDT.
* At 926 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain. Collings Lakes Fire Department reported multiple roads
in downtown Williamstown under water. 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 already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Fire department reported.
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...
Glassboro, Clayton, Berlin, Buena, Chesilhurst, Newfield,
Williamstown, Monroe Township and Sicklerville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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 3976 7504 3983 7491 3979 7490 3978 7490
3978 7488 3979 7484 3979 7482 3977 7479
3975 7477 3973 7473 3951 7498 3967 7519
3966 7522
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
MPS1 follow-up statement
797
WGUS71 KPHI 020321
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1121 PM EDT Tue Sep 1 2026
NJC001-007-015-020331-
/O.CAN.KPHI.FF.W.0152.000000T0000Z-260902T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-Camden NJ-Gloucester NJ-
1121 PM EDT Tue Sep 1 2026
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN ATLANTIC,
SOUTHEASTERN CAMDEN AND SOUTHEASTERN GLOUCESTER COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 3976 7504 3983 7491 3979 7490 3978 7490
3978 7488 3979 7484 3979 7482 3977 7479
3975 7477 3973 7473 3951 7498 3967 7519
3966 7522
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:05 PM EDT | Special Marine Warning | PHI | 85 min | |
| Sep 1, 8:08 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 52 min |
| Sep 1, 8:11 PM EDT | Special Marine Warning | PHI | 94 min | |
| Sep 1, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 58 min |
| Sep 1, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester | 49 min |
| Sep 1, 8:44 PM EDT | Flash Flood Warning | PHI | Gloucester, Salem | 3 hr |
| Sep 1, 8:46 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 59 min |
| Sep 1, 8:57 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 48 min |
| Sep 1, 9:04 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 71 min |
| Sep 1, 9:07 PM EDT | Tornado Warning | PHI | Burlington | 21 min |
| Sep 1, 9:16 PM EDT | Tornado Warning | PHI | Burlington | 12 min |
| Sep 1, 9:19 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex | 116 min |
| Sep 1, 9:22 PM EDT | Special Marine Warning | PHI | 68 min | |
| Sep 1, 9:25 PM EDT | Special Marine Warning | PHI | 95 min | |
| Sep 1, 9:33 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Ocean | 57 min |
| Sep 1, 9:54 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Cape May, Cumberland | 42 min |
| Sep 1, 10:06 PM EDT | Special Marine Warning | PHI | 84 min | |
| Sep 1, 10:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| Sep 1, 11:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| Sep 2, 3:53 AM EDT | Heat Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean | 40 hr |
Nearby
Flash Flood Warnings in New Jersey, 2026Every flash flood warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.