Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 118, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 16, 2026, 11:38 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; 4 counties in 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
- Aug 16, 2026, 11:38 PM EDT (03:38 UTC)
- Expired
- Aug 17, 2026, 3:30 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 03:37 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 00:00Z, 3.6 hours before the alert went out and 231 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
- 28 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
376
WGUS51 KPHI 170338
FFWPHI
NJC005-007-015-PAC017-045-091-101-170730-
/O.NEW.KPHI.FF.W.0118.260817T0338Z-260817T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1138 PM EDT Sun Aug 16 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Burlington County in southern New Jersey...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 330 AM EDT.
* At 1138 PM EDT, Doppler radar indicated heavy rain across the
warned area. Between 0.5 and 1 inch of rain has fallen. The
expected rainfall rate is 2 to 3 inches in 1 hour. Additional
rainfall amounts of 0.5 to 1.5 inches are possible in the warned
area. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
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, Camden, Gloucester City, Cherry Hill, Bensalem,
Mount Laurel, Chester, Willingboro, Deptford, Voorhees, West
Deptford and Florence.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 10 and 53.
Interstate 476 in Pennsylvania between mile markers 0 and 4...and
near mile marker 6.
New Jersey Turnpike between exits 3 and 6A.
Interstate 76 in Pennsylvania between mile markers 339 and 351.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 76 in New Jersey between mile markers 0 and 3.
Pennsylvania Turnpike between mile markers 354 and 359.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3989 7557 3990 7557 3994 7536 4007 7513
4016 7484 4009 7473 3985 7495 3975 7537
3979 7542 3980 7541 3988 7559
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR
$$
Guzzo2 follow-up statements
817
WGUS71 KPHI 170448
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1248 AM EDT Mon Aug 17 2026
NJC005-007-015-PAC017-045-091-101-170730-
/O.CON.KPHI.FF.W.0118.000000T0000Z-260817T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Delaware PA-
Montgomery PA-Philadelphia PA-
1248 AM EDT Mon Aug 17 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT EARLY THIS
MORNING FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN,
NORTHWESTERN GLOUCESTER, SOUTHEASTERN BUCKS, DELAWARE, SOUTHEASTERN
MONTGOMERY AND PHILADELPHIA COUNTIES...
At 1248 AM EDT, Doppler radar indicated heavy rain across the warned
area. Between 0.5 and 1 inch of rain has fallen. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by heavy rain.
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, Camden, Gloucester City, Cherry Hill, Bensalem,
Mount Laurel, Chester, Willingboro, Deptford, Voorhees, West
Deptford and Florence.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 10 and 53.
Interstate 476 in Pennsylvania between mile markers 0 and 6.
New Jersey Turnpike between exits 3 and 6A.
Interstate 76 in Pennsylvania between mile markers 339 and 351.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 76 in New Jersey between mile markers 0 and 3.
Pennsylvania Turnpike between mile markers 353 and 359.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3989 7557 3990 7557 3994 7536 4007 7513
4016 7484 4009 7473 3985 7495 3975 7537
3979 7542 3980 7541 3988 7559
FLASH FLOOD...RADAR INDICATED
$$
Guzzo898
WGUS71 KPHI 170720
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
320 AM EDT Mon Aug 17 2026
NJC005-007-015-PAC017-045-091-101-170730-
/O.EXP.KPHI.FF.W.0118.000000T0000Z-260817T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Delaware PA-
Montgomery PA-Philadelphia PA-
320 AM EDT Mon Aug 17 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 330 AM EDT EARLY THIS MORNING
FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, NORTHWESTERN
GLOUCESTER, SOUTHEASTERN BUCKS, DELAWARE, SOUTHEASTERN MONTGOMERY
AND PHILADELPHIA COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 3989 7557 3990 7557 3994 7536 4007 7513
4016 7484 4009 7473 3985 7495 3975 7537
3979 7542 3980 7541 3988 7559
$$
GuzzoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 4:43 AM EDT | Flash Flood Warning | PHI | Cumberland, Salem | 2 hr |
| Aug 17, 6:09 PM EDT | Special Marine Warning | PHI | 81 min | |
| Aug 16, 11:21 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Aug 17, 1:57 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery, Philadelphia | 4 hr |
| Aug 17, 4:43 PM EDT | Special Weather Statement | PHI | Berks | 47 min |
| Aug 17, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 36 min |
| Aug 17, 5:30 PM EDT | Special Weather Statement | PHI | Berks | 30 min |
| Aug 17, 6:03 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 42 min |
| Aug 17, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 32 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.