Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 72, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 16, 2025, 7:38 PM EDT for Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 16, 2025, 7:38 PM EDT (23:38 UTC)
- Expired
- Jul 16, 2025, 11:45 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mercer County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 50 km from the middle of the area, began a volume at 23:37 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 12:00Z, 11.6 hours before the alert went out and 188 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
- 1571 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 781 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
417
WGUS51 KPHI 162338
FFWPHI
NJC021-PAC017-170345-
/O.NEW.KPHI.FF.W.0072.250716T2338Z-250717T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
738 PM EDT Wed Jul 16 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
West Central Mercer County in central New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
* Until 1145 PM EDT.
* At 738 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 inches of
rain have fallen. Additional rainfall amounts up to 1 inch 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...
Philadelphia, Trenton, Bensalem, Ewing, Pennington, Yardley,
Newtown, Langhorne, Woodside, Langhorn, Levittown and Washington
Crossing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4034 7482 4027 7470 4021 7477 4008 7492
4011 7496 4012 7496 4012 7497 4012 7498
4013 7499 4016 7504 4030 7487
FLASH FLOOD...RADAR INDICATED
$$
AKL1 follow-up statement
053
WGUS71 KPHI 170335
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1135 PM EDT Wed Jul 16 2025
NJC021-PAC017-170345-
/O.EXP.KPHI.FF.W.0072.000000T0000Z-250717T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mercer NJ-Bucks PA-
1135 PM EDT Wed Jul 16 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM EDT THIS EVENING FOR
WEST CENTRAL MERCER AND SOUTHEASTERN BUCKS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flood Watch remains in effect until 300 AM EDT for portions of
east central, northeast, and southeast Pennsylvania.
A Flood Watch remains in effect until 300 AM EDT for portions of
central, northern, and northwest New Jersey.
&&
LAT...LON 4034 7482 4027 7470 4021 7477 4008 7492
4011 7496 4012 7496 4012 7497 4012 7498
4013 7499 4016 7504 4030 7487
$$
AKLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 1:55 AM EDT | Heat Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more | 42 hr |
| Jul 16, 6:46 PM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Jul 16, 7:31 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 29 min |
| Jul 16, 7:37 PM EDT | Special Marine Warning | PHI | 38 min | |
| Jul 16, 7:54 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth, Ocean | 26 min |
Nearby
Flash Flood Warnings in New Jersey, 2025Flash Flood Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.