Alert archive / New Jersey / Flash Flood Warnings in 2025

Flash Flood Warning 87, NWS Philadelphia/Mount Holly

July 31, 2025Middlesex County, Monmouth County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 31, 2025, 4:31 PM EDT for Middlesex County, Monmouth County, New Jersey. 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
Jul 31, 2025, 4:31 PM EDT (20:31 UTC)
Expired
Jul 31, 2025, 7:51 PM EDT
In force
3 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

Counties Middlesex County, NJ, Monmouth County, NJ

The radar

The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 20:32 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

TimeReportWhereRemark
Jul 31, 5:42 PM EDTRAIN 2.01Union Beach, NJReport of 2.01 inches of rain.

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, 8.5 hours before the alert went out and 122 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2025-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1000 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2025-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1000 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
970 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

344 
WGUS51 KPHI 312031
FFWPHI
NJC023-025-010030-
/O.NEW.KPHI.FF.W.0087.250731T2031Z-250801T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
431 PM EDT Thu Jul 31 2025

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northeastern Monmouth County in central New Jersey...
  Southeastern Middlesex County in northern New Jersey...

* Until 830 PM EDT.

* At 431 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 3 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...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...
  Middletown, Old Bridge, Marlboro, Holmdel, Keansburg, Matawan, 
  Morganville, Robertsville, East Freehold, Brownville, Lincroft and 
  Yorketown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4045 7423 4045 7421 4044 7421 4044 7419
      4046 7418 4045 7417 4045 7416 4045 7415
      4046 7414 4043 7408 4042 7406 4042 7404
      4023 7424 4027 7442

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR

$$

Kruzdlo
1 follow-up statement
604 
WGUS71 KPHI 312351 RRA
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
751 PM EDT Thu Jul 31 2025

NJC023-025-010001-
/O.CAN.KPHI.FF.W.0087.000000T0000Z-250801T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-
751 PM EDT Thu Jul 31 2025

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN MONMOUTH AND 
SOUTHEASTERN MIDDLESEX COUNTIES...

Although the heaviest rain has ended, continue to heed any road 
closures that may be in effect due to earlier flooding.

A Flood Watch remains in effect until 1200 AM EDT for portions of 
Delaware, northeast Maryland, New Jersey, and Pennsylvania.

&&

LAT...LON 4045 7423 4045 7421 4044 7421 4044 7419
      4046 7418 4045 7417 4045 7416 4045 7415
      4046 7414 4043 7408 4042 7406 4042 7404
      4023 7424 4027 7442

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 2:24 AM EDTSmall Craft AdvisoryPHI70 hr
Jul 31, 3:56 AM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean4 days
Jul 31, 1:27 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset48 min
Jul 31, 1:48 PM EDTFlash Flood WarningPHIMorris, Somerset4 hr
Jul 31, 1:49 PM EDTTornado WarningPHIMiddlesex, Somerset26 min
Jul 31, 1:55 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer18 min
Jul 31, 2:05 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem40 min
Jul 31, 2:27 PM EDTFlash Flood Warning Considerable damage threatPHICamden, Gloucester4 hr
Jul 31, 2:30 PM EDTFlash Flood WarningPHIMorris4 hr
Jul 31, 2:38 PM EDTSevere Thunderstorm WarningPHIMiddlesex52 min
Jul 31, 2:46 PM EDTFlash Flood Warning Considerable damage threatPHIGloucester, Salem4 hr
Jul 31, 2:52 PM EDTFlash Flood WarningPHIMiddlesex4 hr
Jul 31, 2:55 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester, Salem50 min
Jul 31, 2:57 PM EDTSpecial Marine WarningPHI63 min
Jul 31, 3:03 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth42 min
Jul 31, 3:10 PM EDTFlash Flood Warning Considerable damage threatPHIBurlington, Camden, Gloucester, Mercer, Monmouth, Ocean4 hr
Jul 31, 3:10 PM EDTTornado WarningPHICamden, Gloucester, Salem35 min
Jul 31, 3:12 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean48 min
Jul 31, 3:49 PM EDTFlash Flood WarningPHICamden, Gloucester, Salem4 hr
Jul 31, 4:36 PM EDTSpecial Marine WarningPHI54 min
Jul 31, 4:39 PM EDTSpecial Marine WarningPHI36 min
Jul 31, 4:43 PM EDTFlash Flood WarningPHIMonmouth, Ocean4 hr
Jul 31, 5:21 PM EDTFlash Flood WarningPHICumberland3 hr
Jul 31, 5:53 PM EDTFlash Flood WarningPHIAtlantic, Burlington, Cape May, Ocean4 hr
Jul 31, 6:17 PM EDTSpecial Marine WarningPHI58 min
Jul 31, 6:42 PM EDTSpecial Marine WarningPHI63 min
Jul 31, 7:29 PM EDTSpecial Marine WarningPHI91 min

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.