Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2025, 6:26 PM EDT for 4 counties in New Jersey. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 14, 2025, 6:26 PM EDT (22:26 UTC)
- Expired
- Jul 14, 2025, 9:38 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 22:28 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 14, 8:20 PM EDT | FLASH FLOOD | 1 Ssw Manville, NJ | Picture of a street on X with significant amount of water. More than 1/2 way up tires. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 163 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
- 1 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 728 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
519
WGUS51 KPHI 142226
FFWPHI
NJC019-021-023-035-150230-
/O.NEW.KPHI.FF.W.0065.250714T2226Z-250715T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
626 PM EDT Mon Jul 14 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Mercer County in central New Jersey...
West Central Middlesex County in northern New Jersey...
Southwestern Somerset County in northern New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
* Until 1030 PM EDT.
* At 626 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. 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.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Somerville, East Brunswick, South Brunswick, Manville, Flemington,
Hopewell, Rocky Hill, Stockton, Millstone, Cloverhill, Skillman
and Flagtown.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
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 4058 7472 4059 7462 4041 7447 4038 7462
4033 7493 4055 7504
FLASH FLOOD...RADAR INDICATED
$$
MPS2 follow-up statements
467
WGUS71 KPHI 150041
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
841 PM EDT Mon Jul 14 2025
NJC019-021-150051-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-250715T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-
841 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN MERCER AND
SOUTHEASTERN HUNTERDON COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 200 AM EDT for portions of New
Jersey and Pennsylvania.
&&
LAT...LON 4039 7465 4038 7472 4051 7480 4050 7478
4051 7477 4055 7474 4057 7473 4058 7472
4059 7462 4041 7447 4038 7462
$$
NJC023-035-150230-
/O.CON.KPHI.FF.W.0065.000000T0000Z-250715T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
841 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT THIS
EVENING FOR WEST CENTRAL MIDDLESEX AND SOUTHWESTERN SOMERSET
COUNTIES...
At 841 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 4 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Somerville, East Brunswick, South Brunswick, Manville, Rocky Hill,
Millstone, Belle Mead, Flagtown, Skillman, Kendall Park,
Cloverhill and North Brunswick Township.
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.
Be aware of your surroundings and do not drive on flooded roads.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
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 4039 7465 4038 7472 4051 7480 4050 7478
4051 7477 4055 7474 4057 7473 4058 7472
4059 7462 4041 7447 4038 7462
FLASH FLOOD...RADAR INDICATED
$$
MPS688
WGUS71 KPHI 150138
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
938 PM EDT Mon Jul 14 2025
NJC023-035-150148-
/O.CAN.KPHI.FF.W.0065.000000T0000Z-250715T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Somerset NJ-
938 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL MIDDLESEX AND
SOUTHWESTERN SOMERSET COUNTIES...
The heavy rain has ended. Although the Flash Flood Warning is
cancelled, portions of Middlesex and Somerset counties are in a
Flood Warning. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 200 AM EDT for portions of New
Jersey and Pennsylvania.
&&
LAT...LON 4039 7465 4038 7472 4051 7480 4050 7478
4051 7477 4055 7474 4057 7473 4058 7472
4059 7462 4041 7447 4038 7462
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 4:49 PM EDT | Flash Flood Warning | PHI | Morris, Warren | 3 hr |
| Jul 14, 5:25 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Warren | 4 hr |
| Jul 14, 5:36 PM EDT | Flash Flood Warning | PHI | Middlesex, Morris, Somerset | 4 hr |
| Jul 14, 5:47 PM EDT | Flash Flood Warning | PHI | Morris | 4 hr |
| Jul 14, 6:45 PM EDT | River Flood Warning | PHI | Morris, Somerset | 13 hr |
| Jul 14, 7:11 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth | 4 hr |
| Jul 14, 7:16 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jul 14, 7:45 PM EDT | Flash Flood Warning | PHI | Burlington, Camden | 2 hr |
Nearby
Flash Flood Warnings in New Jersey, 2025Every flash flood warning in 2025
Sources
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.