Alert archive / Pennsylvania / Flash Flood Warnings in 2025
Flash Flood Warning 15, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at May 30, 2025, 11:36 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; 5 counties in Pennsylvania. It was in force for 4 hr. 2 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
- May 30, 2025, 11:36 PM EDT (03:36 UTC)
- Expired
- May 31, 2025, 3:45 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, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 03:39 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 |
|---|---|---|---|
| May 31, 12:05 AM EDT | FLASH FLOOD | 1 Ene Eastwick, PA | Picture of a car that spun out in heavy rain that ended up stuck in flood waters. Time estimated. |
| May 31, 1:00 AM EDT | FLASH FLOOD | 1 Ssw Eddington, PA | Report of Station Avenue closed in Bensalem with vehicles stuck. Time given in report. |
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 00:00Z, 3.6 hours before the alert went out and 212 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
842
WGUS51 KPHI 310336
FFWPHI
NJC005-007-015-PAC017-029-045-091-101-310745-
/O.NEW.KPHI.FF.W.0015.250531T0336Z-250531T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1136 PM EDT Fri May 30 2025
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...
North Central Gloucester County in southern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
East Central Chester County in southeastern Pennsylvania...
Northeastern Delaware County in southeastern Pennsylvania...
Southeastern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 345 AM EDT.
* At 1136 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to 0.5 inches of rain have
fallen. The expected rainfall rate is 0.5 to 1.5 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.
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, Norristown, Willingboro, Deptford, West Deptford,
West Norriton and East Norriton.
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 4012 7550 4015 7543 4014 7534 4018 7517
4017 7510 4017 7493 4016 7490 4014 7484
4012 7479 4010 7479 4005 7480 3997 7487
3988 7499 3979 7515 3980 7521 3982 7519
3992 7535 3995 7552
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Hoeflich2 follow-up statements
181
WGUS71 KPHI 310540
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
140 AM EDT Sat May 31 2025
NJC005-007-015-PAC017-029-045-091-101-310745-
/O.CON.KPHI.FF.W.0015.000000T0000Z-250531T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Chester PA-
Delaware PA-Montgomery PA-Philadelphia PA-
140 AM EDT Sat May 31 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 AM EDT EARLY THIS
MORNING FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, NORTH
CENTRAL GLOUCESTER, SOUTHEASTERN BUCKS, EAST CENTRAL CHESTER,
NORTHEASTERN DELAWARE, SOUTHEASTERN MONTGOMERY AND PHILADELPHIA
COUNTIES...
At 140 AM EDT, trained weather spotters reported heavy rain with
road closures in Bensalem with cars stuck. Between 1 and 2 inches of
rain have fallen. The expected rainfall rate is 0.5 inches in 1
hour. Additional rainfall amounts up to 1 inch are possible in the
warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Trained spotters reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Bensalem,
Mount Laurel, Norristown, Willingboro, Deptford, West Deptford,
West Norriton and East Norriton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4012 7550 4015 7543 4014 7534 4018 7517
4017 7510 4017 7493 4016 7490 4014 7484
4012 7479 4010 7479 4005 7480 3997 7487
3988 7499 3979 7515 3980 7521 3982 7519
3992 7535 3995 7552
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5 INCHES IN 1 HOUR
$$
Hoeflich439
WGUS71 KPHI 310736
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
336 AM EDT Sat May 31 2025
NJC005-007-015-PAC017-029-045-091-101-310746-
/O.EXP.KPHI.FF.W.0015.000000T0000Z-250531T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Chester PA-
Delaware PA-Montgomery PA-Philadelphia PA-
336 AM EDT Sat May 31 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 345 AM EDT EARLY THIS MORNING
FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, NORTH CENTRAL
GLOUCESTER, SOUTHEASTERN BUCKS, EAST CENTRAL CHESTER, NORTHEASTERN
DELAWARE, SOUTHEASTERN MONTGOMERY AND PHILADELPHIA COUNTIES...
The heavy rain has ended. While the threat for widespread flooding
has ended, some creeks and streams continue to slowly rise. More
targeted flood warnings may be needed. Have a way to receive
warnings and please continue to heed remaining road closures.
A Flood Watch remains in effect until 800 AM EDT for portions of
northern Delaware and Pennsylvania.
A Flood Watch remains in effect until 800 AM EDT for portions of
central, northern, northwest, and southern New Jersey.
&&
LAT...LON 4012 7550 4015 7543 4014 7534 4018 7517
4017 7510 4017 7493 4016 7490 4014 7484
4012 7479 4010 7479 4005 7480 3997 7487
3988 7499 3979 7515 3980 7521 3982 7519
3992 7535 3995 7552
$$
HoeflichThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 9:04 PM EDT | Wind Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 10 hr |
| May 30, 11:12 PM EDT | Flash Flood Warning | PHI | Gloucester, Salem | 3 hr |
| May 31, 12:34 AM EDT | Flash Flood Warning | PHI | Burlington, Mercer | 3 hr |
| May 31, 4:00 AM EDT | Areal Flood Warning | PHI | Morris, Sussex, Warren | 9 hr |
| May 31, 4:19 AM EDT | Areal Flood Warning | PHI | Hunterdon | 6 hr |
| May 31, 5:13 AM EDT | Areal Flood Warning | PHI | Somerset | 97 min |
| May 31, 8:46 AM EDT | Areal Flood Warning | PHI | Somerset | 7 hr |
| May 31, 2:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| May 31, 3:10 PM EDT | Special Marine Warning | PHI | 65 min | |
| May 31, 3:14 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 16 min |
| May 31, 4:51 PM EDT | Special Marine Warning | PHI | 84 min | |
| May 31, 5:04 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Gloucester, Salem | 41 min |
| May 31, 6:20 PM EDT | River Flood Warning | PHI | Morris | 12 hr |
| May 31, 1:04 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 4 hr |
| May 31, 5:06 AM EDT | Areal Flood Warning | PHI | Lehigh, Montgomery | 5 hr |
| May 31, 8:42 AM EDT | Areal Flood Warning | PHI | Lehigh | 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.