Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 139, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 27, 2026, 7:00 PM EDT for Burlington County, Camden County, New Jersey; 4 counties in 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 27, 2026, 7:00 PM EDT (23:00 UTC)
- Expired
- Aug 27, 2026, 9:44 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Camden County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 22:59 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, 11.0 hours before the alert went out and 220 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
- 346 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 890 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
826
WGUS51 KPHI 272300
FFWPHI
NJC005-007-PAC017-045-091-101-280300-
/O.NEW.KPHI.FF.W.0139.260827T2300Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
700 PM EDT Thu Aug 27 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...
South Central Bucks County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 1100 PM EDT.
* At 700 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 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 indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Philadelphia, Camden, Gloucester City, Bensalem, Yeadon, Riverside,
Conshohocken, Palmyra, Jenkintown, Westville and Narberth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4008 7540 4016 7505 4012 7490 4011 7488
4008 7487 3987 7513 3989 7514 3988 7517
3994 7529 4002 7542 4003 7540 4004 7541
4007 7536 4007 7537 4006 7539
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
PHI2 follow-up statements
723
WGUS71 KPHI 280046
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
846 PM EDT Thu Aug 27 2026
NJC005-007-PAC017-045-091-101-280300-
/O.CON.KPHI.FF.W.0139.000000T0000Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Bucks PA-Delaware PA-Montgomery PA-
Philadelphia PA-
846 PM EDT Thu Aug 27 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 11 PM EDT THIS EVENING
FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, SOUTH CENTRAL
BUCKS, NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND
PHILADELPHIA COUNTIES...
At 846 PM EDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2.5 inches of rain have
fallen. Additional rainfall amounts up to 0.5 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Philadelphia, Camden, Gloucester City, Bensalem, Yeadon, Riverside,
Conshohocken, Palmyra, Jenkintown, Westville and Narberth.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4008 7540 4016 7505 4012 7490 4011 7488
4008 7487 3987 7513 3989 7514 3988 7517
3994 7529 4002 7542 4003 7540 4004 7541
4007 7536 4007 7537 4006 7539
FLASH FLOOD...RADAR INDICATED
$$
PHI923
WGUS71 KPHI 280144
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
944 PM EDT Thu Aug 27 2026
NJC005-007-PAC017-045-091-101-280154-
/O.CAN.KPHI.FF.W.0139.000000T0000Z-260828T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Bucks PA-Delaware PA-Montgomery PA-
Philadelphia PA-
944 PM EDT Thu Aug 27 2026
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON,
NORTHWESTERN CAMDEN, SOUTH CENTRAL BUCKS, NORTHEASTERN 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.
A Flood Watch remains in effect until 400 AM EDT Friday for portions
of northern Delaware, New Jersey, and Pennsylvania.
&&
LAT...LON 4008 7540 4016 7505 4012 7490 4011 7488
4008 7487 3987 7513 3989 7514 3988 7517
3994 7529 4002 7542 4003 7540 4004 7541
4007 7536 4007 7537 4006 7539
$$
PHIThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 11:38 AM EDT | Flash Flood Warning | PHI | Gloucester | 4 hr |
| Aug 27, 12:26 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 49 min |
| Aug 27, 12:41 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 5 hr |
| Aug 27, 1:06 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex | 24 min |
| Aug 27, 1:07 PM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 27, 1:15 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 45 min |
| Aug 27, 1:17 PM EDT | Flash Flood Warning | PHI | Mercer, Somerset | 7 hr |
| Aug 27, 1:20 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 40 min |
| Aug 27, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 49 min |
| Aug 27, 1:32 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 43 min |
| Aug 27, 1:34 PM EDT | Special Marine Warning | PHI | 21 min | |
| Aug 27, 1:50 PM EDT | Flash Flood Warning | PHI | Salem | 4 hr |
| Aug 27, 1:57 PM EDT | Tornado Warning | PHI | Salem | 11 min |
| Aug 27, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 28 min |
| Aug 27, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 47 min |
| Aug 27, 2:16 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 44 min |
| Aug 27, 2:18 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth | 4 hr |
| Aug 27, 2:20 PM EDT | Special Marine Warning | PHI | 40 min | |
| Aug 27, 2:31 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 44 min |
| Aug 27, 2:38 PM EDT | Flash Flood Warning | PHI | Camden | 4 hr |
| Aug 27, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 30 min |
| Aug 27, 3:00 PM EDT | Special Marine Warning | PHI | 60 min | |
| Aug 27, 3:04 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden | 41 min |
| Aug 27, 3:26 PM EDT | Areal Flood Warning | PHI | Gloucester, Salem | 5 hr |
| Aug 27, 3:43 PM EDT | Flash Flood Warning | PHI | Camden | 3 hr |
| Aug 27, 4:52 PM EDT | Flash Flood Warning | PHI | Warren | 3 hr |
| Aug 27, 4:59 PM EDT | Areal Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 27, 5:44 PM EDT | Areal Flood Warning | PHI | Camden, Gloucester | 5 hr |
| Aug 27, 6:17 PM EDT | Areal Flood Warning | PHI | Middlesex, Monmouth | 4 hr |
| Aug 27, 7:26 PM EDT | Special Marine Warning | PHI | 32 min | |
| Aug 27, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 39 min |
| Aug 27, 5:08 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 4 hr |
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.