Alert archive / New Jersey / Flash Flood Warnings in 2026
Flash Flood Warning 101, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 5, 2026, 3:33 PM EDT for Hunterdon County, Warren County, New Jersey; Bucks County, Pennsylvania. It was in force for 86 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 5, 2026, 3:33 PM EDT (19:33 UTC)
- Expired
- Aug 5, 2026, 4:59 PM EDT
- In force
- 86 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 93 km from the middle of the area, began a volume at 19:33 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, 7.6 hours before the alert went out and 187 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.
859
WGUS51 KPHI 051933
FFWPHI
NJC019-041-PAC017-052330-
/O.NEW.KPHI.FF.W.0101.260805T1933Z-260805T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
333 PM EDT Wed Aug 5 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Hunterdon County in northwestern New Jersey...
Southwestern Warren County in northwestern New Jersey...
North Central Bucks County in southeastern Pennsylvania...
* Until 730 PM EDT.
* At 333 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain just beginning to move into the
warned area. These storms have a history of producing 1 to 2
inches of rainfall within an hour and causing flash flooding.
Flash flooding is ongoing or expected to begin shortly.
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...
Easton, Flemington, High Bridge, Clinton, Alpha, Glen Gardner,
Ferndale, Hampton, Frenchtown, Lebanon, Milford and Califon.
This includes Interstate 78 in New Jersey between mile markers 0 and
23.
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 4063 7519 4065 7520 4067 7518 4068 7520
4071 7520 4073 7518 4074 7519 4074 7479
4051 7477 4050 7478 4051 7480 4048 7478
4047 7520 4062 7520
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Fitzsimmons1 follow-up statement
069
WGUS71 KPHI 052059
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
459 PM EDT Wed Aug 5 2026
NJC019-041-PAC017-052109-
/O.CAN.KPHI.FF.W.0101.000000T0000Z-260805T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Bucks PA-
459 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING IS CANCELLED FOR HUNTERDON, SOUTHWESTERN
WARREN AND NORTH CENTRAL BUCKS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat.
&&
LAT...LON 4063 7519 4065 7520 4067 7518 4068 7520
4071 7520 4073 7518 4074 7519 4074 7479
4051 7477 4050 7478 4051 7480 4048 7478
4047 7520 4062 7520
$$
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, 2:50 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer | 4 hr |
| 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.