Alert archive / Pennsylvania / Flash Flood Warnings in 2026
Flash Flood Warning 97, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 5, 2026, 1:13 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania; Gloucester County, New Jersey. It was in force for 5 hr. 7 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, 1:13 PM EDT (17:13 UTC)
- Expired
- Aug 5, 2026, 6:30 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Gloucester County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 17:15 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, 1:50 PM EDT | FLASH FLOOD | 1 E Platt Memorial Brid, PA | South 26th Street flooded near I-95. |
| Aug 5, 2:00 PM EDT | FLASH FLOOD | 1 Sw Point Breeze, PA | I-76 east flooded. Several other reported of roads flooded in South Philadelphia. |
| Aug 5, 2:02 PM EDT | RAIN 1.23 | Philadelphia Internatio, PA | ASOS station KPHL Philadelphia International Airport. |
| Aug 5, 2:09 PM EDT | FLASH FLOOD | 1 Sw Point Breeze, PA | Flooding on I-76 eastbound at Exit 347A. There is a ramp restriction. |
| Aug 5, 2:09 PM EDT | FLASH FLOOD | 1 Wsw Point Breeze, PA | Flooding on I-76 westbound. There is a traffic disruption due to the flooding. |
| Aug 5, 2:12 PM EDT | FLASH FLOOD | 1 E Eastwick, PA | Flooding on I-95 southbound just south of Exit 12A. There is a lane restriction. |
| Aug 5, 2:54 PM EDT | RAIN 1.23 | Philadelphia Internatio, PA | 0.71 inches fell in just 7 minutes. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.2 hours before the alert went out and 213 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
- 257 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 494 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
064
WGUS51 KPHI 051713
FFWPHI
NJC015-PAC045-091-101-052115-
/O.NEW.KPHI.FF.W.0097.260805T1713Z-260805T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
113 PM EDT Wed Aug 5 2026
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Gloucester County in southern New Jersey...
Eastern Delaware County in southeastern Pennsylvania...
South Central Montgomery County in southeastern Pennsylvania...
Western Philadelphia County in southeastern Pennsylvania...
* Until 515 PM EDT.
* At 113 PM EDT, Doppler radar indicated heavy rain moving into the
warned area. Up to 0.5 inches of rain have fallen across portions
of the area. 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...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, Gloucester City, Chester, Deptford, West Deptford,
Yeadon, Woodbury, Conshohocken, Folcroft, Swarthmore, Paulsboro
and Westville.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 12 and 25.
Interstate 476 in Pennsylvania between mile markers 0 and 13.
New Jersey Turnpike near exit 2.
Interstate 76 in Pennsylvania between mile markers 333 and 350.
Interstate 95 in Pennsylvania between mile markers 4 and 17.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3988 7541 3998 7544 3999 7544 4000 7545
4013 7519 3991 7515 3980 7508 3979 7507
3979 7508 3978 7509 3978 7508 3977 7507
3978 7506 3977 7506 3971 7531
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 30 MINUTES
$$
Fitzsimmons4 follow-up statements
832
WGUS71 KPHI 051906
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
306 PM EDT Wed Aug 5 2026
NJC015-PAC045-091-101-052115-
/O.CON.KPHI.FF.W.0097.000000T0000Z-260805T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-Delaware PA-Montgomery PA-Philadelphia PA-
306 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT THIS
AFTERNOON FOR NORTHWESTERN GLOUCESTER, EASTERN DELAWARE, SOUTH
CENTRAL MONTGOMERY AND WESTERN PHILADELPHIA COUNTIES...
At 306 PM EDT, gauge reports and radar indicated that up to 2 inches
of rainfall has fallen across portions of the warned area. There
have also been reports of street flooding in south Philadelphia. The
area of rain responsible for the flash flooding has moved out of the
area but additional rainfall amounts up to 0.5 inches are possible
in the warned area as additional rainfall is approaching from the
south and west. Flash flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Gauges reported.
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, Gloucester City, Chester, Deptford, West Deptford,
Yeadon, Woodbury, Conshohocken, Folcroft, Swarthmore, Paulsboro
and Westville.
This includes the following highways...
Interstate 295 in New Jersey between mile markers 12 and 25.
Interstate 476 in Pennsylvania between mile markers 0 and 15.
New Jersey Turnpike near exit 2.
Interstate 76 in Pennsylvania between mile markers 332 and 350.
Interstate 95 in Pennsylvania between mile markers 4 and 18.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3988 7541 3998 7544 3999 7544 4000 7545
4013 7519 3991 7515 3980 7508 3979 7507
3979 7508 3978 7509 3978 7508 3977 7507
3978 7506 3977 7506 3971 7531
FLASH FLOOD...GAUGE INDICATED
EXPECTED RAINFALL RATE...0.5-1 INCH IN 30 MINUTES
$$
Fitzsimmons216
WGUS71 KPHI 052056
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
456 PM EDT Wed Aug 5 2026
NJC015-052106-
/O.CAN.KPHI.FF.W.0097.000000T0000Z-260805T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-
456 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN GLOUCESTER
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
&&
LAT...LON 4013 7519 3991 7515 3989 7514 3988 7519
3986 7523 3985 7528 3985 7533 3983 7538
3997 7540 4002 7539
$$
PAC045-091-101-052115-
/O.CON.KPHI.FF.W.0097.000000T0000Z-260805T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware PA-Montgomery PA-Philadelphia PA-
456 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT THIS
AFTERNOON FOR EASTERN DELAWARE, SOUTH CENTRAL MONTGOMERY AND WESTERN
PHILADELPHIA COUNTIES...
At 456 PM EDT, Doppler radar and automated rain gauges indicated
that heavy rain was falling across the warned area. Up to 2 inches
of rain have fallen. Additional rainfall amounts up to 0.5 inches
are possible in the warned area. Flash flooding has already been
occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Philadelphia, Chester, Yeadon, Conshohocken, Folcroft, Swarthmore,
Narberth, National Park, East Lansdowne, Morris Park, Drexel Hill
and Roxborough.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 0 and 13.
Interstate 76 in Pennsylvania between mile markers 333 and 350.
Interstate 95 in Pennsylvania between mile markers 5 and 18.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4013 7519 3991 7515 3989 7514 3988 7519
3986 7523 3985 7528 3985 7533 3983 7538
3997 7540 4002 7539
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Fitzsimmons579
WGUS51 KPHI 052057
FFWPHI
PAC045-091-101-052230-
/O.EXT.KPHI.FF.W.0097.000000T0000Z-260805T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
457 PM EDT Wed Aug 5 2026
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Eastern Delaware County in southeastern Pennsylvania...
South Central Montgomery County in southeastern Pennsylvania...
Western Philadelphia County in southeastern Pennsylvania...
* Until 630 PM EDT.
* At 457 PM EDT, Doppler radar and automated rain gauges indicated
that heavy rain was falling across the warned area. Up to 2 inches
of rain have fallen. Additional rainfall amounts up to 0.5 inches
are possible in the warned area. Flash flooding has already been
occurring.
HAZARD...Flash flooding caused by heavy rain.
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...
Philadelphia, Chester, Yeadon, Conshohocken, Folcroft, Swarthmore,
Narberth, National Park, East Lansdowne, Morris Park, Drexel Hill
and Roxborough.
This includes the following highways...
Interstate 476 in Pennsylvania between mile markers 0 and 13.
Interstate 76 in Pennsylvania between mile markers 333 and 350.
Interstate 95 in Pennsylvania between mile markers 5 and 18.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 4013 7519 3991 7515 3989 7514 3988 7519
3986 7523 3985 7528 3985 7533 3983 7538
3997 7540 4002 7539
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Fitzsimmons507
WGUS71 KPHI 052221
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
621 PM EDT Wed Aug 5 2026
PAC045-091-101-052231-
/O.EXP.KPHI.FF.W.0097.000000T0000Z-260805T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Delaware PA-Montgomery PA-Philadelphia PA-
621 PM EDT Wed Aug 5 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT THIS EVENING FOR
EASTERN DELAWARE, SOUTH CENTRAL MONTGOMERY AND WESTERN PHILADELPHIA
COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
&&
LAT...LON 4013 7519 3991 7515 3989 7514 3988 7519
3986 7523 3985 7528 3985 7533 3983 7538
3997 7540 4002 7539
$$
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 | Bucks, Montgomery, Philadelphia | 6 hr |
| Aug 5, 1:23 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Aug 5, 1:50 PM EDT | Heat Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 3 days |
| Aug 5, 2:17 PM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 4 hr |
| Aug 5, 2:50 PM EDT | Flash Flood Warning | PHI | Bucks | 4 hr |
| Aug 5, 3:33 PM EDT | Flash Flood Warning | PHI | Bucks | 86 min |
| Aug 5, 5:29 PM EDT | Flash Flood Warning | PHI | Middlesex | 3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.