Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 100, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 5, 2026, 2:50 PM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 4 hr. 2 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
- Aug 5, 2026, 2:50 PM EDT (18:50 UTC)
- Expired
- Aug 5, 2026, 6:22 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 18:50 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 |
|---|---|---|---|
| Aug 5, 3:00 PM EDT | FLASH FLOOD | 3 Nw Washington Crossin, NJ | Flooding on River Road. |
| Aug 5, 3:15 PM EDT | FLASH FLOOD | 2 Nnw Wrightstown Twp, PA | Pine Lane is flooded and impassable. |
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, 6.8 hours before the alert went out and 186 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
- 1372 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
248
WGUS51 KPHI 051850
FFWPHI
NJC019-021-PAC017-052300-
/O.NEW.KPHI.FF.W.0100.260805T1850Z-260805T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
250 PM EDT Wed Aug 5 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Mercer County in central New Jersey...
Southeastern Hunterdon County in northwestern New Jersey...
Central Bucks County in southeastern Pennsylvania...
* Until 700 PM EDT.
* At 250 PM EDT, Doppler radar indicated heavy rainfall producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. The expected rainfall rate is 0.5 to 1 inch in 30
minutes. Additional rainfall amounts up to 2 inches are possible
in the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding caused by heavy
rainfall.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
* Some locations that may experience flash flooding include...
Trenton, Ewing, Doylestown, Byram, Bedminster, Flemington,
Chalfont, Tinicum, Pennington, New Hope, Yardley and Newtown.
This includes Interstate 295 in New Jersey between mile markers 65
and 76.
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.
&&
LAT...LON 4041 7474 4039 7473 4038 7472 4025 7465
4020 7485 4026 7521 4026 7522 4027 7523
4027 7524 4028 7525 4028 7526 4036 7527
4047 7516 4052 7480 4045 7476 4044 7476
4042 7475
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...0.5-1 INCH IN 30 MINUTES
$$
Fitzsimmons2 follow-up statements
438
WGUS71 KPHI 052109
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
509 PM EDT Wed Aug 5 2026
NJC019-021-PAC017-052300-
/O.CON.KPHI.FF.W.0100.000000T0000Z-260805T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Bucks PA-
509 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING
FOR NORTHWESTERN MERCER, SOUTHEASTERN HUNTERDON AND CENTRAL BUCKS
COUNTIES...
At 509 PM EDT, Doppler radar and automated rain gauges indicate 1 to
2 inches of rainfall have fallen across the warned area from heavy
showers and embedded thunderstorms. Additional rainfall amounts up
to 1 inch are possible in the warned area. Flash flooding has
already been occuring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Trenton, Ewing, Doylestown, Byram, Bedminster, Flemington,
Chalfont, Tinicum, Pennington, New Hope, Yardley and Newtown.
This includes Interstate 295 in New Jersey between mile markers 65
and 76.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4041 7474 4039 7473 4038 7472 4025 7465
4020 7485 4026 7521 4026 7522 4027 7523
4027 7524 4028 7525 4028 7526 4036 7527
4047 7516 4052 7480 4045 7476 4044 7476
4042 7475
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Fitzsimmons551
WGUS71 KPHI 052222
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
622 PM EDT Wed Aug 5 2026
NJC019-021-PAC017-052232-
/O.CAN.KPHI.FF.W.0100.000000T0000Z-260805T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Mercer NJ-Bucks PA-
622 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN MERCER,
SOUTHEASTERN HUNTERDON AND CENTRAL BUCKS 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 4041 7474 4039 7473 4038 7472 4025 7465
4020 7485 4026 7521 4026 7522 4027 7523
4027 7524 4028 7525 4028 7526 4036 7527
4047 7516 4052 7480 4045 7476 4044 7476
4042 7475
$$
FitzsimmonsThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 12:58 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 6 hr |
| Aug 5, 1:13 PM EDT | Flash Flood Warning | PHI | Gloucester | 5 hr |
| Aug 5, 1:23 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer | 4 hr |
| Aug 5, 1:50 PM EDT | Heat Advisory | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 6 more | 3 days |
| Aug 5, 3:33 PM EDT | Flash Flood Warning | PHI | Hunterdon, Warren | 86 min |
| Aug 5, 5:29 PM EDT | Flash Flood Warning | PHI | Middlesex | 3 hr |
| Aug 5, 2:17 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
Nearby
Flash Flood Warnings in New Jersey, 2026Flash Flood Warnings in Pennsylvania, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.