Alert archive / New Jersey / Flash Flood Warnings in 2025
Flash Flood Warning 93, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 17, 2025, 8:12 PM EDT for Burlington County, New Jersey. It was in force for 4 hr. 12 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 17, 2025, 8:12 PM EDT (00:12 UTC)
- Expired
- Aug 17, 2025, 11:55 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Burlington County, NJ
The radar
The Philadelphia radar (KDIX), 30 km from the middle of the area, began a volume at 00:14 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 17, 8:50 PM EDT | RAIN 2.52 | 1 Sse Rancocas, NJ | 2.52 inches of rain in one hour. |
| Aug 17, 9:00 PM EDT | FLASH FLOOD | Lumberton, NJ | Several roads flooded and impassable. |
| Aug 17, 9:18 PM EDT | RAIN 2.99 | 1 Ese Lumberton Twp, NJ | Mesonet station GW2630 Lumberton. |
| Aug 17, 9:20 PM EDT | RAIN 1.83 | 1 Nne Rancocas, NJ | Mesonet station FW5135 Willingboro. |
| Aug 17, 9:30 PM EDT | RAIN 3.74 | Lumberton Twp, NJ | Private weather station. |
| Aug 17, 9:50 PM EDT | RAIN 3.32 | 1 Sse Rancocas, NJ | Updated report from 1 SSE Rancocas. 2.52 inches of rain occurred from about 7:50 PM to 8:50 PM. |
| Aug 17, 10:00 PM EDT | RAIN 1.97 | 1 Nne Rancocas, NJ | Mesonet station FW5135 Willingboro. |
| Aug 17, 10:00 PM EDT | RAIN 2.19 | Mount Holly Wfo, NJ | Mesonet station EW3827 Westampton. |
| Aug 17, 10:00 PM EDT | RAIN 3.88 | Lumberton Twp, NJ | Personal weather station. |
| Aug 17, 10:30 PM EDT | RAIN 3.06 | 1 Nne Rancocas, NJ | Mesonet station FW5135 Willingboro. |
| Aug 17, 10:56 PM EDT | FLASH FLOOD | Willingboro, NJ | East River Drive flooded with approximately 2 feet of water. |
| Aug 17, 11:27 PM EDT | FLASH FLOOD | 1 Ese Mount Holly Wfo, NJ | RT541 is flooded in all lanes - 2 vehicles stuck in water. |
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, 0.2 hours before the alert went out and 190 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
- 677 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 920 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
314
WGUS51 KPHI 180012
FFWPHI
NJC005-180215-
/O.NEW.KPHI.FF.W.0093.250818T0012Z-250818T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
812 PM EDT Sun Aug 17 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Central Burlington County in southern New Jersey...
* Until 1015 PM EDT.
* At 812 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1.5 inches of
rain have fallen. The expected rainfall rate is 1 to 2 inches in
30 minutes. Additional rainfall amounts of 0.5 to 1.5 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
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...
Willingboro, Medford, Lumberton, Mount Holly, Pemberton,
Leisuretowne, Cinnaminson, Nws Office, Pemberton Heights and
Moorestown-Lenola.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3995 7460 3988 7459 3987 7468 3989 7480
3994 7490 4000 7500 4004 7492 4002 7482
3999 7470
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 30 MINUTES
$$
Gorse3 follow-up statements
614
WGUS71 KPHI 180049
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
849 PM EDT Sun Aug 17 2025
NJC005-180215-
/O.CON.KPHI.FF.W.0093.000000T0000Z-250818T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
849 PM EDT Sun Aug 17 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT THIS
EVENING FOR CENTRAL BURLINGTON COUNTY...
At 849 PM EDT, trained weather spotters reported thunderstorms
producing heavy rain across the warned area. Between 1 and 2.5
inches of rain have fallen. The expected rainfall rate is 1 to 2
inches in 30 minutes. Additional rainfall amounts of 0.5 to 1.5
inches are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Trained spotters reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Willingboro, Medford, Lumberton, Mount Holly, Pemberton,
Leisuretowne, Cinnaminson, Nws Office, Pemberton Heights and
Moorestown-Lenola.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3995 7460 3988 7459 3987 7468 3989 7480
3994 7490 4000 7500 4004 7492 4002 7482
3999 7470
FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 30 MINUTES
$$
Gorse796
WGUS51 KPHI 180150
FFWPHI
NJC005-180415-
/O.EXT.KPHI.FF.W.0093.000000T0000Z-250818T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
950 PM EDT Sun Aug 17 2025
The National Weather Service in Mount Holly has extended the
* Flash Flood Warning for...
Central Burlington County in southern New Jersey...
* Until 1215 AM EDT.
* At 950 PM EDT, Doppler radar and automated rain gauges indicate
another area of showers and thunderstorms producing heavy rain
will arrive across the warned area from the west. Between 1.5 and
4 inches of rain has fallen from the first round. The expected
rainfall rate is 1.5 to 2.5 inches in 1 hour. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
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...
Willingboro, Medford, Lumberton, Mount Holly, Pemberton,
Leisuretowne, Cinnaminson, Nws Office, Pemberton Heights and
Moorestown-Lenola.
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 3995 7460 3988 7459 3987 7468 3989 7480
3994 7490 4000 7500 4004 7492 4002 7482
3999 7470
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR
$$
Gorse568
WGUS71 KPHI 180355
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1155 PM EDT Sun Aug 17 2025
NJC005-007-PAC017-091-101-180405-
/O.CAN.KPHI.FF.W.0093.000000T0000Z-250818T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Bucks PA-Montgomery PA-Philadelphia PA-
1155 PM EDT Sun Aug 17 2025
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN BURLINGTON,
NORTHWESTERN CAMDEN, SOUTHEASTERN BUCKS, SOUTHEASTERN MONTGOMERY AND
PHILADELPHIA COUNTIES...
Flash Flood Warnings have been converted to an areal Flood Warning
as the flood waters will take several hours for all the water from
these storms to work through local drainage systems in urban areas.
Please continue to heed remaining road closures.
&&
LAT...LON 4019 7514 4024 7505 4019 7487 4012 7473
4002 7484 4004 7492 4000 7499 3996 7493
3987 7507 3996 7521 4007 7529
$$
DealThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 9:09 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 17, 10:01 PM EDT | Flash Flood Warning | PHI | Burlington, Camden | 119 min |
| Aug 17, 11:55 PM EDT | Areal Flood Warning | PHI | Burlington, Camden | 4 hr |
| Aug 18, 4:45 AM EDT | Coastal Flood Advisory | PHI | Atlantic, Burlington, Cape May | 17 hr |
Nearby
Flash 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.