Alert archive / New Jersey / Flash Flood Warnings in 2025

Flash Flood Warning 6, NWS Philadelphia/Mount Holly

May 16, 2025New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at May 16, 2025, 11:32 AM EDT for New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania. 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: May 16, 2025, 11:32 AM EDT (15:32 UTC)
Expired: May 16, 2025, 3:30 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 15:33 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 16, 12:15 PM EDT	FLOOD	Eddystone, PA	Flooding on I-95 southbound at Exit 7: I-476 NORTH - PLYMOUTH MEETINGS. There is a ramp restriction.
May 16, 12:15 PM EDT	FLASH FLOOD	Upper Darby, PA	Flash flooding with multiple water rescues ongoing.
May 16, 12:21 PM EDT	FLASH FLOOD	Collingdale, PA	Water rescues taking place due to flash flooding on Chester Pike in Norwood.
May 16, 12:21 PM EDT	FLASH FLOOD	Folcroft, PA	Water rescues taking place due to flash flooding on Chester Pike in Folcroft.
May 16, 12:21 PM EDT	FLASH FLOOD	Norwood, PA	Water rescues taking place due to flash flooding on Chester Pike in Norwood.
May 16, 12:21 PM EDT	FLASH FLOOD	Prospect Park, PA	Water rescues taking place due to flash flooding in Prospect park.
May 16, 12:23 PM EDT	FLASH FLOOD	Upper Darby, PA	Flash flooding with multiple streets closed due to not being able to drive on.
May 16, 12:25 PM EDT	FLASH FLOOD	1 Sw Eastwick, PA	Flooding on I-95 northbound at Exit 17: PA 611 NORTH BROAD ST/PATTISON AVE. There is a ramp closure.
May 16, 12:50 PM EDT	FLASH FLOOD	Camden, NJ	Flooding on US 130 southbound I-76 in Gloucester City. 2 right lanes of 3 lanes closed.
May 16, 12:52 PM EDT	FLASH FLOOD	1 Wnw Point Breeze, PA	Extensive flooding and traffic disruptions on I-76. Significant traffic disruptions reported.
May 16, 1:10 PM EDT	FLASH FLOOD	Yardley, PA	Video of water rushing over roadways around Yardley.
May 16, 1:16 PM EDT	FLOOD	Burlington Twp, NJ	Pinewald Lane flooded.

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, 3.5 hours before the alert went out and 205 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

910 
WGUS51 KPHI 161532
FFWPHI
DEC003-NJC005-007-015-021-033-PAC017-045-091-101-161930-
/O.NEW.KPHI.FF.W.0006.250516T1532Z-250516T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1132 AM EDT Fri May 16 2025

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northeastern New Castle County in northern Delaware...
  Southwestern Mercer County in central New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northeastern Salem County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...

* Until 330 PM EDT.

* At 1132 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 1 inch of rain has 
  fallen. The expected rainfall rate is 2 to 4 inches in 1 hour. 
  Additional rainfall amounts of 1 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...
  Philadelphia, Trenton, Camden, Wilmington, Gloucester City, 
  Bensalem, Ewing, Chester, Florence, Yeadon, Burlington and Bristol.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4008 7526 4029 7476 4025 7464 4019 7460
      4018 7461 4016 7460 4011 7466 4002 7493
      3986 7516 3980 7533 3973 7550 3981 7561
      3996 7540

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...2-4 INCHES IN 1 HOUR

$$

Kruzdlo

2 follow-up statements

586 
WGUS71 KPHI 161626
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1226 PM EDT Fri May 16 2025

DEC003-NJC005-007-015-021-033-PAC017-045-091-101-161930-
/O.CON.KPHI.FF.W.0006.000000T0000Z-250516T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Burlington NJ-Camden NJ-Gloucester NJ-Mercer NJ-
Salem NJ-Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
1226 PM EDT Fri May 16 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM EDT THIS 
AFTERNOON FOR NORTHEASTERN NEW CASTLE, SOUTHWESTERN MERCER, 
NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, NORTHWESTERN 
GLOUCESTER, NORTHEASTERN SALEM, SOUTHEASTERN BUCKS, DELAWARE, 
SOUTHEASTERN MONTGOMERY AND PHILADELPHIA COUNTIES...

At 1226 PM EDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to 1 inch of rain has fallen. 
The expected rainfall rate is 2 to 4 inches in 1 hour. Additional 
rainfall amounts of 1 to 1.5 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, Trenton, Camden, Wilmington, Gloucester City, 
  Bensalem, Ewing, Chester, Florence, Yeadon, Burlington and Bristol.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 4008 7526 4029 7476 4025 7464 4019 7460
      4018 7461 4016 7460 4011 7466 4002 7493
      3986 7516 3980 7533 3973 7550 3981 7561
      3996 7540

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...2-4 INCHES IN 1 HOUR

$$

Kruzdlo

640 
WGUS71 KPHI 161923
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
323 PM EDT Fri May 16 2025

DEC003-NJC005-007-015-021-033-PAC017-045-091-101-161933-
/O.EXP.KPHI.FF.W.0006.000000T0000Z-250516T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Burlington NJ-Camden NJ-Gloucester NJ-Mercer NJ-
Salem NJ-Bucks PA-Delaware PA-Montgomery PA-Philadelphia PA-
323 PM EDT Fri May 16 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 330 PM EDT THIS AFTERNOON FOR 
NORTHEASTERN NEW CASTLE, SOUTHWESTERN MERCER, NORTHWESTERN 
BURLINGTON, NORTHWESTERN CAMDEN, NORTHWESTERN GLOUCESTER, 
NORTHEASTERN SALEM, SOUTHEASTERN BUCKS, DELAWARE, SOUTHEASTERN 
MONTGOMERY AND PHILADELPHIA COUNTIES...

Flooding has ended or continues to recede. Please continue to heed 
remaining road closures if you encounter any.

&&

LAT...LON 4008 7526 4029 7476 4025 7464 4019 7460
      4018 7461 4016 7460 4011 7466 4002 7493
      3986 7516 3980 7533 3973 7550 3981 7561
      3996 7540

$$

Kruzdlo

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 9:34 PM EDT	Dense Fog Advisory	PHI	Kent, New Castle, Sussex	12 hr
May 16, 11:16 AM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
May 16, 12:20 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min
May 16, 1:52 PM EDT	Tornado Warning	PHI	Sussex	38 min
May 16, 2:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	42 min
May 16, 2:23 PM EDT	Tornado Warning	PHI	Sussex	52 min
May 16, 6:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Kent, New Castle, Sussex	70 min
May 16, 6:56 PM EDT	Tornado Warning	PHI	Sussex	34 min
May 15, 9:30 PM EDT	Marine Dense Fog Advisory	PHI		15 hr
May 16, 11:41 AM EDT	Special Marine Warning	PHI		49 min
May 16, 11:46 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	59 min
May 16, 12:22 PM EDT	Tornado Warning	PHI	Cumberland, Salem	23 min
May 16, 12:31 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Camden, Gloucester	4 hr
May 16, 12:42 PM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	48 min
May 16, 12:45 PM EDT	Tornado Warning	PHI	Atlantic, Camden, Gloucester	30 min
May 16, 12:47 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Burlington, Camden, Gloucester, Salem	4 hr
May 16, 12:49 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	56 min
May 16, 12:51 PM EDT	Special Marine Warning	PHI		114 min
May 16, 12:52 PM EDT	Tornado Warning	PHI	Atlantic, Camden, Gloucester	23 min
May 16, 1:26 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	49 min
May 16, 1:28 PM EDT	Flash Flood Warning	PHI	Burlington, Ocean	3 hr
May 16, 1:32 PM EDT	Special Marine Warning	PHI		88 min
May 16, 1:36 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Atlantic, Cape May, Ocean	3 hr
May 16, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	32 min
May 16, 2:01 PM EDT	Special Marine Warning	PHI		86 min
May 16, 2:24 PM EDT	Areal Flood Warning	PHI	Hunterdon, Somerset	94 min
May 16, 6:31 PM EDT	Special Marine Warning	PHI		119 min
May 16, 10:24 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	66 min
May 16, 11:22 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	53 min
May 16, 11:41 AM EDT	Flash Flood Warning	PHI	Chester, Delaware	4 hr
May 16, 12:21 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	4 hr
May 16, 2:02 PM EDT	River Flood Warning	PHI	Chester	5 hr
May 16, 3:29 PM EDT	Areal Flood Warning	PHI	Berks	6 hr
May 16, 3:53 PM EDT	Areal Flood Warning	PHI	Montgomery	100 min
May 16, 4:42 PM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	4 hr
May 16, 5:15 PM EDT	Areal Flood Warning	PHI	Bucks	112 min
May 16, 6:43 PM EDT	Areal Flood Warning	PHI	Philadelphia	113 min

Nearby

Flash Flood Warnings in New Jersey, 2025 Flash Flood Warnings in Pennsylvania, 2025 Flash Flood Warnings in Delaware, 2025 Every 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.