Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 87, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 3, 2026, 12:05 AM EDT for Hunterdon County, Warren County, New Jersey; Bucks County, Monroe County, Northampton County, Pennsylvania. It was in force for 3 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
- Aug 3, 2026, 12:05 AM EDT (04:05 UTC)
- Expired
- Aug 3, 2026, 3:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 04:07 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 00:00Z, 4.1 hours before the alert went out and 184 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
- 151 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 198 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted.
090
WGUS51 KPHI 030405
FFWPHI
NJC019-041-PAC017-089-095-030730-
/O.NEW.KPHI.FF.W.0087.260803T0405Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1205 AM EDT Mon Aug 3 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
West Central Hunterdon County in northwestern New Jersey...
Warren County in northwestern New Jersey...
Eastern Northampton County in eastern Pennsylvania...
Southeastern Monroe County in northeastern Pennsylvania...
North Central Bucks County in southeastern Pennsylvania...
* Until 330 AM EDT.
* At 1205 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 1.5 inches of rain have fallen. The expected rainfall rate
is 1 to 2 inches in 1 hour. 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 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, East Stroudsburg, Washington, Blairstown, Bangor, Pen
Argyl, Wind Gap, Belvidere, Harmony, Oxford, Alpha and Hope.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 0 and 8.
Interstate 80 in New Jersey between mile markers 0 and 13.
Interstate 80 in Pennsylvania between mile markers 311 and 314.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4113 7507 4109 7504 4108 7503 4108 7502
4108 7501 4109 7501 4109 7500 4109 7499
4109 7498 4108 7495 4102 7489 4059 7507
4052 7527 4081 7516 4086 7531
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Cooper2 follow-up statements
838
WGUS71 KPHI 030512
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
112 AM EDT Mon Aug 3 2026
NJC019-041-PAC017-089-095-030730-
/O.CON.KPHI.FF.W.0087.000000T0000Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Bucks PA-Monroe PA-Northampton PA-
112 AM EDT Mon Aug 3 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT EARLY THIS
MORNING FOR WEST CENTRAL HUNTERDON, WARREN, EASTERN NORTHAMPTON,
SOUTHEASTERN MONROE AND NORTH CENTRAL BUCKS COUNTIES...
At 112 AM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1.5 and 2.5 inches of rain have fallen. Flooding impacts will
continue, but no additional rainfall is expected. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Easton, East Stroudsburg, Washington, Blairstown, Bangor, Pen
Argyl, Wind Gap, Belvidere, Harmony, Oxford, Alpha and Hope.
This includes the following highways...
Interstate 78 in New Jersey between mile markers 0 and 9.
Interstate 80 in New Jersey between mile markers 0 and 13.
Interstate 80 in Pennsylvania between mile markers 311 and 314.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4113 7507 4109 7504 4108 7503 4108 7502
4108 7501 4109 7501 4109 7500 4109 7499
4109 7498 4108 7495 4102 7489 4059 7507
4052 7527 4081 7516 4086 7531
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Cooper370
WGUS71 KPHI 030721 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
321 AM EDT Mon Aug 3 2026
NJC019-041-PAC017-089-095-030731-
/O.EXP.KPHI.FF.W.0087.000000T0000Z-260803T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Warren NJ-Bucks PA-Monroe PA-Northampton PA-
321 AM EDT Mon Aug 3 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 330 AM EDT EARLY THIS MORNING
FOR WEST CENTRAL HUNTERDON, WARREN, EASTERN NORTHAMPTON,
SOUTHEASTERN MONROE AND NORTH 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.
A Flood Watch remains in effect until 1100 PM EDT Monday for
portions of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4113 7507 4109 7504 4108 7503 4108 7502
4108 7501 4109 7501 4109 7500 4109 7499
4109 7498 4108 7495 4102 7489 4059 7507
4052 7527 4081 7516 4086 7531
$$
CooperThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 11:20 PM EDT | Flash Flood Warning | PHI | Warren | 4 hr |
| Aug 3, 12:36 AM EDT | Special Marine Warning | PHI | 84 min | |
| Aug 3, 2:50 AM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Morris, Somerset | 4 hr |
| Aug 3, 3:05 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 40 min |
| Aug 3, 4:41 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Somerset | 2 hr |
| Aug 3, 5:59 AM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 3, 7:02 AM EDT | Areal Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Somerset | 3 hr |
| Aug 3, 8:21 AM EDT | Special Marine Warning | PHI | 69 min | |
| Aug 3, 9:08 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 3 hr |
| Aug 3, 10:12 AM EDT | Flash Flood Warning | PHI | Atlantic, Cumberland, Salem | 86 min |
| Aug 3, 10:36 AM EDT | Flash Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 6 hr |
| Aug 3, 10:44 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 6 hr |
| Aug 3, 12:01 PM EDT | Areal Flood Warning | PHI | Mercer | 74 min |
| Aug 3, 1:20 PM EDT | Areal Flood Warning | PHI | Burlington, Camden, Mercer | 4 hr |
| Aug 3, 1:51 PM EDT | Special Marine Warning | PHI | 24 min | |
| Aug 3, 2:53 PM EDT | Special Marine Warning | PHI | 97 min | |
| Aug 3, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 27 min |
| Aug 3, 5:15 PM EDT | Special Marine Warning | PHI | 90 min | |
| Aug 3, 3:01 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery | 3 hr |
| Aug 3, 6:26 AM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 94 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2026Flash Flood Warnings in New Jersey, 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.