Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at May 14, 2025, 3:24 PM EDT for 4 counties in New Jersey. It was in force for 4 hr. 5 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
- May 14, 2025, 3:24 PM EDT (19:24 UTC)
- Expired
- May 14, 2025, 7:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 19:25 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 |
|---|---|---|---|
| May 14, 3:25 PM EDT | FLASH FLOOD | 1 Ese Metuchen, NJ | Video shared on social media showed deep flood waters flowing down Amboy Avenue in Edison. Nearby weather station indicated rainfall rates over 2 inches per hour. |
| May 14, 4:00 PM EDT | FLASH FLOOD | Watchung, NJ | Stony Brook at Watchung rapidly rose into minor flood stage, reaching a peak stage of 14.35 feet. Flood stage is 14 feet. |
| May 14, 4:45 PM EDT | RAIN 2.41 | Matawan, NJ | Rainfall since Midnight. |
| May 14, 4:47 PM EDT | RAIN 2.7 | 1 Ene Long Hill Twp, NJ | Mesonet station FW9434 Long Hill Twsp. |
| May 14, 5:15 PM EDT | FLASH FLOOD | 1 Ssw Chatham, NJ | The Passaic River at Chatham rapidly rose into minor 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, 7.4 hours before the alert went out and 130 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 733 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
986
WGUS51 KPHI 141924
FFWPHI
NJC023-025-027-035-142330-
/O.NEW.KPHI.FF.W.0004.250514T1924Z-250514T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
324 PM EDT Wed May 14 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
North Central Monmouth County in central New Jersey...
Middlesex County in northern New Jersey...
Southeastern Morris County in northern New Jersey...
Eastern Somerset County in northern New Jersey...
* Until 730 PM EDT.
* At 324 PM EDT, trained weather spotters reported thunderstorms
producing heavy rain across the warned area. Between 1.5 and 2.5
inches of rain have fallen. The expected rainfall rate is 0.5 to
1.5 inches in 1 hour. Additional rainfall amounts of 0.5 to 1 inch
are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
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, Perth Amboy, Morristown, Somerset, Edison, Old
Bridge, East Brunswick, Sayreville, North Brunswick, Marlboro,
Carteret and Holmdel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4080 7450 4085 7436 4082 7433 4076 7438
4075 7436 4067 7446 4066 7440 4060 7446
4059 7420 4049 7429 4044 7421 4046 7414
4042 7413 4029 7422 4028 7431 4037 7448
4049 7455 4065 7457
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
DBR2 follow-up statements
656
WGUS71 KPHI 142011
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
411 PM EDT Wed May 14 2025
NJC023-025-027-035-142330-
/O.CON.KPHI.FF.W.0004.000000T0000Z-250514T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Morris NJ-Somerset NJ-
411 PM EDT Wed May 14 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM EDT THIS
EVENING FOR NORTH CENTRAL MONMOUTH, MIDDLESEX, SOUTHEASTERN MORRIS
AND EASTERN SOMERSET COUNTIES...
At 411 PM EDT, trained weather spotters reported thunderstorms
producing heavy rain across the warned area. Between 1.5 and 2.5
inches of rain have fallen so far today. The expected rainfall rate
is 0.5 to 1 inch in 1 hour. Additional rainfall amounts of 0.5 to 1
inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
New Brunswick, Perth Amboy, Morristown, Somerset, Edison, Old
Bridge, East Brunswick, Sayreville, North Brunswick, Marlboro,
Carteret and Holmdel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4080 7450 4085 7436 4082 7433 4076 7438
4075 7436 4067 7446 4066 7440 4060 7446
4059 7420 4049 7429 4044 7421 4046 7414
4042 7413 4029 7422 4028 7431 4037 7448
4049 7455 4065 7457
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR
$$
Staarmann151
WGUS71 KPHI 142331
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
731 PM EDT Wed May 14 2025
NJC023-025-027-035-142341-
/O.EXP.KPHI.FF.W.0004.000000T0000Z-250514T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Morris NJ-Somerset NJ-
731 PM EDT Wed May 14 2025
...FLASH FLOOD WARNING HAS EXPIRED FOR NORTH CENTRAL MONMOUTH,
MIDDLESEX, SOUTHEASTERN MORRIS AND EASTERN SOMERSET COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4080 7450 4085 7436 4082 7433 4076 7438
4075 7436 4067 7446 4066 7440 4060 7446
4059 7420 4049 7429 4044 7421 4046 7414
4042 7413 4029 7422 4028 7431 4037 7448
4049 7455 4065 7457
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 9:13 AM EDT | Coastal Flood Advisory | PHI | Burlington, Camden, Gloucester | 22 hr |
| May 14, 12:09 PM EDT | Flash Flood Warning | PHI | Burlington, Camden | 4 hr |
| May 14, 5:45 PM EDT | River Flood Warning | PHI | Morris, Somerset | 4 hr |
| May 14, 6:41 PM EDT | Marine Dense Fog Advisory | PHI | 21 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.