Alert archive / Pennsylvania / Flash Flood Warnings in 2025
Flash Flood Warning 81, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 31, 2025, 2:27 PM EDT for Camden County, Gloucester County, New Jersey; 4 counties in Pennsylvania. It was in force for 4 hr. 11 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
- Jul 31, 2025, 2:27 PM EDT (18:27 UTC)
- Expired
- Jul 31, 2025, 6:30 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Camden County, NJ, Gloucester County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 18:31 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 |
|---|---|---|---|
| Jul 31, 3:38 PM EDT | FLASH FLOOD | Upper Southampton Twp, PA | Second Street Pike and Street Road closed due to three to four feet of water in Upper Southampton Township. |
| Jul 31, 3:44 PM EDT | FLASH FLOOD | Camden, NJ | Flooding on Delaware Ave between market street and cooper street in Camden. At least one vehicle stranded. |
| Jul 31, 3:45 PM EDT | FLASH FLOOD | Upper Southampton Twp, PA | Stump Road and Bustleton Pike in Southampton Township is closed due to flooding. |
| Jul 31, 3:50 PM EDT | FLASH FLOOD | 1 Sw Lower Southampton, PA | A vehicle is stranded in flood water at the intersection of Brookside Drive and Winding Lane in Lower Southampton Township with a water rescue occurring for the occupant. |
| Jul 31, 3:54 PM EDT | FLASH FLOOD | 1 S Upper Southampton T, PA | Industrial Blvd in Upper Southampton Township is closed due to flooding with up to three feet of water on the roadway. |
| Jul 31, 3:56 PM EDT | FLASH FLOOD | 1 Nnw Somerton, PA | Multiple water rescues due to flooded vehicles at the intersection of Donna Drive and Clearview Ave. |
| Jul 31, 3:56 PM EDT | FLASH FLOOD | 2 Nnw Somerton, PA | Multiple water rescues at the intersection of County line Road and Pine Road due to flooded vehicles. |
| Jul 31, 3:56 PM EDT | FLASH FLOOD | 2 Nw Somerton, PA | Multiple water rescues due to vehicles flooded at the intersection of Andrew Road and Blake Road. |
| Jul 31, 3:56 PM EDT | FLASH FLOOD | 2 S Upper Southampton T, PA | Multiple water rescues due to flooded vehicles at the intersection of County Line Road and Buck Road. |
| Jul 31, 3:56 PM EDT | FLASH FLOOD | Lower Moreland Twp, PA | Multiple water rescues on Philmont Ave due to vehicles flooded. |
| Jul 31, 4:09 PM EDT | FLASH FLOOD | Philadelphia, PA | Water pouring into the Septa station in Chinatown. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.5 hours before the alert went out and 207 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
- 1000 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 970 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
As transmitted.
628
WGUS51 KPHI 311827
FFWPHI
NJC007-015-PAC017-045-091-101-312230-
/O.NEW.KPHI.FF.W.0081.250731T1827Z-250731T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
227 PM EDT Thu Jul 31 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Camden County in southern New Jersey...
North Central Gloucester County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
Eastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 630 PM EDT.
* At 227 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. The expected rainfall rate is 1.5 to 3 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...Life threatening flash flooding caused by
thunderstorms.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
* Some locations that may experience flash flooding include...
Philadelphia, Camden, Gloucester City, Bensalem, Yeadon, Bristol,
Conshohocken, Palmyra, Hatboro, Folcroft, Ambler and Swarthmore.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4020 7477 4009 7487 4007 7493 4002 7504
3993 7508 3987 7514 3982 7524 3985 7531
4000 7544 4035 7500
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1.5-3 INCHES IN 1 HOUR
$$
Kruzdlo1 follow-up statement
513
WGUS71 KPHI 312221
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
621 PM EDT Thu Jul 31 2025
NJC007-015-PAC017-045-091-101-312231-
/O.EXP.KPHI.FF.W.0081.000000T0000Z-250731T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-Bucks PA-Delaware PA-Montgomery PA-
Philadelphia PA-
621 PM EDT Thu Jul 31 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM EDT THIS EVENING FOR
NORTHWESTERN CAMDEN, NORTH CENTRAL GLOUCESTER, SOUTHEASTERN BUCKS,
EASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND PHILADELPHIA
COUNTIES...
Although the heaviest rain has ended, continue to heed any road
closures that may be in effect due to earlier flooding.
A Flood Watch still remains in effect until 600 AM EDT Friday for
portions of northern Delaware, New Jersey, and southeast
Pennsylvania.
&&
LAT...LON 4020 7477 4009 7487 4007 7493 4002 7504
3993 7508 3987 7514 3982 7524 3985 7531
4000 7544 4035 7500
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:24 AM EDT | Small Craft Advisory | PHI | 70 hr | |
| Jul 31, 3:56 AM EDT | Rip Current Statement | PHI | Atlantic, Cape May, Monmouth, Ocean | 4 days |
| Jul 31, 1:27 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 48 min |
| Jul 31, 1:48 PM EDT | Flash Flood Warning | PHI | Morris, Somerset | 4 hr |
| Jul 31, 1:49 PM EDT | Tornado Warning | PHI | Middlesex, Somerset | 26 min |
| Jul 31, 1:55 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer | 18 min |
| Jul 31, 2:05 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 40 min |
| Jul 31, 2:30 PM EDT | Flash Flood Warning | PHI | Morris | 4 hr |
| Jul 31, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex | 52 min |
| Jul 31, 2:46 PM EDT | Flash Flood Warning | PHI | Gloucester, Salem | 4 hr |
| Jul 31, 2:52 PM EDT | Flash Flood Warning | PHI | Middlesex | 4 hr |
| Jul 31, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 50 min |
| Jul 31, 2:57 PM EDT | Special Marine Warning | PHI | 63 min | |
| Jul 31, 3:03 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 42 min |
| Jul 31, 3:10 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean | 4 hr |
| Jul 31, 3:10 PM EDT | Tornado Warning | PHI | Camden, Gloucester, Salem | 35 min |
| Jul 31, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 48 min |
| Jul 31, 3:49 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 4 hr |
| Jul 31, 4:31 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth | 3 hr |
| Jul 31, 4:36 PM EDT | Special Marine Warning | PHI | 54 min | |
| Jul 31, 4:39 PM EDT | Special Marine Warning | PHI | 36 min | |
| Jul 31, 4:43 PM EDT | Flash Flood Warning | PHI | Monmouth, Ocean | 4 hr |
| Jul 31, 5:21 PM EDT | Flash Flood Warning | PHI | Cumberland | 3 hr |
| Jul 31, 5:53 PM EDT | Flash Flood Warning | PHI | Atlantic, Burlington, Cape May, Ocean | 4 hr |
| Jul 31, 6:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Jul 31, 6:42 PM EDT | Special Marine Warning | PHI | 63 min | |
| Jul 31, 7:29 PM EDT | Special Marine Warning | PHI | 91 min | |
| Jul 31, 12:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery | 64 min |
| Jul 31, 12:19 PM EDT | Flash Flood Warning | PHI | Berks | 4 hr |
| Jul 31, 12:53 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 67 min |
| Jul 31, 1:27 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 4 hr |
| Jul 31, 2:03 PM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 2 hr |
| Jul 31, 2:09 PM EDT | Flash Flood Warning | PHI | Delaware | 4 hr |
Nearby
Flash Flood Warnings in Pennsylvania, 2025Flash Flood Warnings in New Jersey, 2025Every flash flood warning in 2025
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.