Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 14, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at May 30, 2025, 11:12 PM EDT for Gloucester County, Salem County, New Jersey; Chester County, Delaware County, Pennsylvania. It was in force for 3 hr. 1 report 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, 11:12 PM EDT (03:12 UTC)
- Expired
- May 31, 2025, 2:21 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 03:15 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 |
|---|---|---|---|
| May 31, 12:05 AM EDT | FLASH FLOOD | Upland, PA | Three lanes flooded on I-95 at Exit 4 near Chester and the Commodore Barry Bridge. Time estimated. |
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 00:00Z, 3.2 hours before the alert went out and 182 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
- 926 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 804 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 5.5
The text
As transmitted.
771
WGUS51 KPHI 310312
FFWPHI
NJC015-033-PAC029-045-310715-
/O.NEW.KPHI.FF.W.0014.250531T0312Z-250531T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1112 PM EDT Fri May 30 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northwestern Gloucester County in southern New Jersey...
Northwestern Salem County in southern New Jersey...
Southeastern Chester County in southeastern Pennsylvania...
Southern Delaware County in southeastern Pennsylvania...
* Until 315 AM EDT.
* At 1112 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 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.
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...
Chester, West Deptford, Pennsville, Westtown, Carneys Point,
Folcroft, Swarthmore, Paulsboro, Kennett Square, Penns Grove and
West Grove.
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 3987 7588 3991 7585 3994 7567 3994 7539
3992 7533 3983 7519 3978 7518 3965 7546
3965 7553 3972 7551 3971 7548 3977 7546
3980 7541 3983 7551 3983 7562 3980 7571
3972 7577 3972 7579 3972 7591 3977 7593
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Hoeflich2 follow-up statements
721
WGUS71 KPHI 310436
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1236 AM EDT Sat May 31 2025
NJC015-033-PAC029-045-310715-
/O.CON.KPHI.FF.W.0014.000000T0000Z-250531T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-Salem NJ-Chester PA-Delaware PA-
1236 AM EDT Sat May 31 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM EDT EARLY THIS
MORNING FOR NORTHWESTERN GLOUCESTER, NORTHWESTERN SALEM,
SOUTHEASTERN CHESTER AND SOUTHERN DELAWARE COUNTIES...
At 1236 AM EDT, trained weather spotters reported thunderstorms
producing heavy rain along I-95 in Delaware County, with 3 lanes
flooded at Exit 4 near Chester and the Commodore Barry Bridge.
Between 1 and 1.5 inches of rain have fallen. The expected rainfall
rate is 0.5 inches in 1 hour. Additional rainfall amounts of 0.5 to
1 inch are possible in the warned area. Flash flooding is already
occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Wilmington, Chester, West Deptford, Pennsville, Westtown, Carneys
Point, Folcroft, Swarthmore, Paulsboro, Kennett Square, Penns
Grove and West Grove.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3987 7588 3991 7585 3994 7567 3994 7539
3992 7533 3983 7519 3978 7518 3965 7546
3965 7553 3972 7551 3971 7548 3977 7546
3980 7541 3983 7551 3983 7562 3980 7571
3972 7577 3972 7579 3972 7591 3977 7593
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5 INCHES IN 1 HOUR
$$
Hoeflich025
WGUS71 KPHI 310621 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
221 AM EDT Sat May 31 2025
NJC015-033-PAC029-045-310631-
/O.CAN.KPHI.FF.W.0014.000000T0000Z-250531T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-Salem NJ-Chester PA-Delaware PA-
221 AM EDT Sat May 31 2025
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN GLOUCESTER,
NORTHWESTERN SALEM, SOUTHEASTERN CHESTER AND SOUTHERN DELAWARE
COUNTIES...
Flooding is no longer expected to pose a threat. 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 3987 7588 3991 7585 3994 7567 3994 7539
3992 7533 3983 7519 3978 7518 3965 7546
3965 7553 3972 7551 3971 7548 3977 7546
3980 7541 3983 7551 3983 7562 3980 7571
3972 7577 3972 7579 3972 7591 3977 7593
$$
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, 11:36 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 4 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 New Jersey, 2025Flash Flood Warnings in Pennsylvania, 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.