Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 63, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2025, 5:36 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 4 hr. 11 reports 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, 5:36 PM EDT (21:36 UTC)
- Expired
- Jul 14, 2025, 9:28 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 21:38 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, 5:45 PM EDT | FLASH FLOOD | 1 Wsw Hazelton, NJ | Flooding reported on NJ 27 Southbound. Time estimated. |
| Jul 14, 5:45 PM EDT | FLASH FLOOD | North Plainfield, NJ | Stony Brook at North Plainfield reached flood stage. |
| Jul 14, 5:45 PM EDT | FLASH FLOOD | Watchung, NJ | Stony Brook at Watchung reached flood stage. |
| Jul 14, 6:00 PM EDT | FLASH FLOOD | 1 Nw Bound Brook, NJ | Multiple reports of flooding on US 22 closing all lanes. Time estimated. |
| Jul 14, 6:30 PM EDT | FLASH FLOOD | 1 Ssw Chatham, NJ | Passaic River at Chatham reached flood stage. |
| Jul 14, 6:45 PM EDT | FLASH FLOOD | Piscataway, NJ | Portions of I-287 became fully submerged. Time included in report. |
| Jul 14, 7:00 PM EDT | FLASH FLOOD | Chatham, NJ | Roadways flooded in Chatham. Time estimated. |
| Jul 14, 7:45 PM EDT | FLASH FLOOD | 1 W South Bound Brook, NJ | Middle Brook at Bound Brook reached flood stage. |
| Jul 14, 7:55 PM EDT | FLASH FLOOD | North Brunswick, NJ | Portions of Miltown Rd. completely flooded. |
| 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. |
| Jul 14, 9:15 PM EDT | FLOOD | 1 Nw Middlesex, NJ | Bound Brook at Middlesex reached flood stage. |
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, 9.6 hours before the alert went out and 131 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.
449
WGUS51 KPHI 142136
FFWPHI
NJC023-027-035-150145-
/O.NEW.KPHI.FF.W.0063.250714T2136Z-250715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
536 PM EDT Mon Jul 14 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northeastern Middlesex County in northern New Jersey...
Southeastern Morris County in northern New Jersey...
Eastern Somerset County in northern New Jersey...
* Until 945 PM EDT.
* At 536 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...
New Brunswick, Morristown, Somerville, Somerset, Edison, East
Brunswick, North Brunswick, Carteret, Madison, Middlesex, Florham
Park and Bound Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
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 4079 7446 4081 7438 4080 7437 4076 7438
4075 7436 4072 7439 4072 7440 4067 7446
4066 7445 4066 7443 4066 7442 4066 7440
4062 7443 4060 7446 4061 7431 4059 7429
4060 7422 4059 7420 4044 7449 4053 7463
FLASH FLOOD...RADAR INDICATED
$$
MPS3 follow-up statements
021
WGUS71 KPHI 142144
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
544 PM EDT Mon Jul 14 2025
NJC023-027-035-150145-
/O.CON.KPHI.FF.W.0063.000000T0000Z-250715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Morris NJ-Somerset NJ-
544 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EDT THIS
EVENING FOR NORTHEASTERN MIDDLESEX, SOUTHEASTERN MORRIS AND EASTERN
SOMERSET COUNTIES...
At 544 PM EDT, gauge reports indicated thunderstorms producing heavy
rain in Watchung. Between 2 and 3 inches of rain have fallen.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Gauges reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
New Brunswick, Morristown, Somerville, Somerset, Edison, East
Brunswick, North Brunswick, Carteret, Madison, Middlesex, Florham
Park and Bound Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4079 7446 4081 7438 4080 7437 4076 7438
4075 7436 4072 7439 4072 7440 4067 7446
4066 7445 4066 7443 4066 7442 4066 7440
4062 7443 4060 7446 4061 7431 4059 7429
4060 7422 4059 7420 4044 7449 4053 7463
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS210
WGUS71 KPHI 142230
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
630 PM EDT Mon Jul 14 2025
NJC023-027-035-150145-
/O.CON.KPHI.FF.W.0063.000000T0000Z-250715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Morris NJ-Somerset NJ-
630 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 945 PM EDT THIS
EVENING FOR NORTHEASTERN MIDDLESEX, SOUTHEASTERN MORRIS AND EASTERN
SOMERSET COUNTIES...
At 630 PM EDT, local law enforcement reported thunderstorms
producing heavy rain in Woodbridge Township. Between 3 and 4 inches
of rain have fallen. Additional rainfall amounts of 1 to 2 inches
are possible in the warned area. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported flooding on area roads.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
Some locations that may experience flash flooding include...
New Brunswick, Morristown, Somerville, Somerset, Edison, East
Brunswick, North Brunswick, Carteret, Madison, Middlesex, Florham
Park and Bound Brook.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
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 4079 7446 4081 7438 4080 7437 4076 7438
4075 7436 4072 7439 4072 7440 4067 7446
4066 7445 4066 7443 4066 7442 4066 7440
4062 7443 4060 7446 4061 7431 4059 7429
4060 7422 4059 7420 4044 7449 4053 7463
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MPS947
WGUS71 KPHI 150128
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
928 PM EDT Mon Jul 14 2025
NJC023-027-035-150138-
/O.CAN.KPHI.FF.W.0063.000000T0000Z-250715T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Morris NJ-Somerset NJ-
928 PM EDT Mon Jul 14 2025
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN MIDDLESEX,
SOUTHEASTERN MORRIS AND EASTERN SOMERSET COUNTIES...
The heavy rain has ended, but flooding continues. This Flash Flood
Warning has been replaced by a Flood Warning. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 200 AM EDT for portions of New
Jersey and Pennsylvania.
&&
LAT...LON 4079 7446 4081 7438 4080 7437 4076 7438
4075 7436 4072 7439 4072 7440 4067 7446
4066 7445 4066 7443 4066 7442 4066 7440
4062 7443 4060 7446 4061 7431 4059 7429
4060 7422 4059 7420 4044 7449 4053 7463
$$
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, 5:47 PM EDT | Flash Flood Warning | PHI | Morris | 4 hr |
| Jul 14, 6:26 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 3 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.