Alert archive / New Jersey / Flash Flood Warnings in 2025

Flash Flood Warning 9, NWS Philadelphia/Mount Holly

May 16, 2025Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 16, 2025, 12:31 PM EDT for Camden County, Gloucester County, New Jersey. 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 16, 2025, 12:31 PM EDT (16:31 UTC)
Expired: May 16, 2025, 4:30 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

The radar

The Philadelphia radar (KDIX), 70 km from the middle of the area, began a volume at 16:30 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, 12:55 PM EDT	FLASH FLOOD	Blackwood, NJ	Video of a road flooded and completely impassable. Time given in report.
May 16, 1:16 PM EDT	FLASH FLOOD	Hi-Nella, NJ	Flash flooding with a road closure of Atlantic Avenue and Minnehaha Road.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.5 hours before the alert went out and 209 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: 1302 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted.

758 
WGUS51 KPHI 161631
FFWPHI
NJC007-015-162030-
/O.NEW.KPHI.FF.W.0009.250516T1631Z-250516T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1231 PM EDT Fri May 16 2025

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...

* Until 430 PM EDT.

* At 1231 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 2 to 4 inches in 1 hour. 
  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...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...
  Camden, Gloucester City, Cherry Hill, Deptford, Voorhees, West 
  Deptford, Lindenwold, Bellmawr, Woodbury, Paulsboro, Magnolia and 
  Westville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3970 7533 3973 7537 3974 7538 3975 7538
      3977 7540 3982 7529 3986 7518 3990 7512
      3992 7508 3995 7504 3984 7494 3980 7497
      3978 7504 3973 7522

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

$$

Kruzdlo

1 follow-up statement

147 
WGUS71 KPHI 162022
FFSPHI

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

NJC007-015-162032-
/O.EXP.KPHI.FF.W.0009.000000T0000Z-250516T2030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-
422 PM EDT Fri May 16 2025

...FLASH FLOOD WARNING WILL EXPIRE AT 430 PM EDT THIS AFTERNOON FOR 
NORTHWESTERN CAMDEN AND NORTHWESTERN GLOUCESTER COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 3970 7533 3973 7537 3974 7538 3975 7538
      3977 7540 3982 7529 3986 7518 3990 7512
      3992 7508 3995 7504 3984 7494 3980 7497
      3978 7504 3973 7522

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 9:30 PM EDT	Marine Dense Fog Advisory	PHI		15 hr
May 15, 9:34 PM EDT	Dense Fog Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	12 hr
May 16, 11:16 AM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	59 min
May 16, 11:32 AM EDT	Flash Flood Warning	PHI	Burlington, Camden, Gloucester, Mercer, Salem	4 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, 12:20 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	40 min
May 16, 12:22 PM EDT	Tornado Warning	PHI	Cumberland, Salem	23 min
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, 6:35 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Cape May, Cumberland, Gloucester, Salem	70 min

Nearby

Flash Flood Warnings in New Jersey, 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.