Alert archive / New Jersey / Flash Flood Warnings in 2024

Flash Flood Warning 40, NWS Philadelphia/Mount Holly

August 6, 20245 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 6, 2024, 7:24 PM EDT for 5 counties in New Jersey. It was in force for 5 hr. 8 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 6, 2024, 7:24 PM EDT (23:24 UTC)
Expired
Aug 7, 2024, 12:25 AM EDT
In force
5 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 23:27 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
Aug 6, 7:30 PM EDTFLASH FLOODYorketown, NJCommanck Lane is closed due to flooding.
Aug 6, 8:04 PM EDTFLASH FLOOD1 Sw South River, NJNJ DOT - STMC: Flooding on NJ 18 both directions CR 535/Cranbury Rd (East Brunswick Twp) All lanes closed northbound.
Aug 6, 8:19 PM EDTFLASH FLOOD1 S South Amboy, NJNJ DOT - STMC: Flooding on NJ 35 southbound ramp to Pine Av (Sayreville) All lanes closed.
Aug 6, 9:45 PM EDTRAIN 2.042 Ssw Browntown, NJMesonet station FW8442 Old Bridge.
Aug 6, 9:45 PM EDTRAIN 2.551 Ene Sayreville, NJMesonet station DW5872 Sayreville.
Aug 6, 9:48 PM EDTRAIN 2.521 Wnw Matawan, NJMesonet station EW6999 Matawan.
Aug 6, 9:50 PM EDTRAIN 2.391 Ene Milltown, NJMesonet station ESTBR 1 ENE Milltown.
Aug 6, 9:50 PM EDTRAIN 3.442 Ese Yorketown, NJMesonet station ENGLS Englishtown (LaFayette Mills).

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, 11.4 hours before the alert went out and 137 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 2024-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1440 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 2024-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 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
1440 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.2

Open this sounding in Storm Lab

The text

As transmitted.

718 
WGUS51 KPHI 062324
FFWPHI
NJC005-021-023-025-029-070330-
/O.NEW.KPHI.FF.W.0040.240806T2324Z-240807T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
724 PM EDT Tue Aug 6 2024

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Southeastern Mercer County in central New Jersey...
  Central Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Northwestern Ocean County in southern New Jersey...

* Until 1130 PM EDT.

* At 724 PM EDT, Doppler radar and automated rain gauges 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 1 hour. Additional rainfall amounts of 1 to 3 
  inches 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...
  Trenton, New Brunswick, Perth Amboy, Edison, Old Bridge, East 
  Brunswick, South Brunswick, Sayreville, North Brunswick, Marlboro, 
  Manalapan and Carteret.

This includes the following highways...
	Interstate 295 in New Jersey between mile markers 57 and 63.
	New Jersey Turnpike between exits 8 and 13.
	Interstate 287 in New Jersey between mile markers 0 and 3.
	Interstate 195 in New Jersey between mile markers 0 and 18.
	Garden State Parkway between mile markers 115 and 134.

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 4025 7452 4036 7459 4060 7434 4061 7431
      4059 7429 4060 7422 4059 7420 4056 7422
      4055 7425 4050 7426 4049 7427 4046 7426
      4045 7421 4044 7421 4031 7411 4007 7455
      4014 7473 4016 7472 4022 7477

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

$$

MJL
2 follow-up statements
834 
WGUS51 KPHI 070307
FFWPHI
NJC005-021-023-025-029-070530-
/O.EXT.KPHI.FF.W.0040.000000T0000Z-240807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1107 PM EDT Tue Aug 6 2024

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  Southeastern Mercer County in central New Jersey...
  Central Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Northeastern Burlington County in southern New Jersey...
  Northwestern Ocean County in southern New Jersey...

* Until 130 AM EDT.

* At 1107 PM EDT, Doppler radar and automated rain gauges 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 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 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...
  Trenton, New Brunswick, Perth Amboy, Edison, Old Bridge, East 
  Brunswick, South Brunswick, Sayreville, North Brunswick, Marlboro, 
  Manalapan and Carteret.

This includes the following highways...
	Interstate 295 in New Jersey between mile markers 57 and 63.
	New Jersey Turnpike between exits 8 and 13.
	Interstate 287 in New Jersey between mile markers 0 and 3.
	Interstate 195 in New Jersey between mile markers 0 and 18.
	Garden State Parkway between mile markers 116 and 134.

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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4025 7452 4036 7459 4060 7434 4061 7431
      4059 7429 4060 7422 4059 7420 4056 7422
      4055 7425 4050 7426 4049 7427 4046 7426
      4045 7421 4044 7421 4031 7411 4007 7455
      4014 7473 4016 7472 4022 7477

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

$$

MPS
694 
WGUS71 KPHI 070425 RRA
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1225 AM EDT Wed Aug 7 2024

NJC005-021-023-025-029-070435-
/O.CAN.KPHI.FF.W.0040.000000T0000Z-240807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Mercer NJ-Middlesex NJ-Monmouth NJ-Ocean NJ-
1225 AM EDT Wed Aug 7 2024

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MERCER, CENTRAL 
MONMOUTH, MIDDLESEX, NORTHEASTERN BURLINGTON AND NORTHWESTERN OCEAN 
COUNTIES...

The heavy rain has ended. While the flash flood threat has ended, 
flooding remains an issue and a new Flood Warning will be issued. 
Please continue to heed remaining road closures.

A Flood Watch remains in effect until 1200 PM EDT Wednesday for 
portions of northern Delaware, New Jersey, and Pennsylvania.

&&

LAT...LON 4025 7452 4036 7459 4060 7434 4061 7431
      4059 7429 4060 7422 4059 7420 4056 7422
      4055 7425 4050 7426 4049 7427 4046 7426
      4045 7421 4044 7421 4031 7411 4007 7455
      4014 7473 4016 7472 4022 7477

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 9:37 AM EDTHeat AdvisoryPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more9 hr
Aug 6, 9:39 AM EDTSmall Craft AdvisoryPHI10 hr
Aug 6, 2:04 PM EDTSpecial Marine WarningPHI56 min
Aug 6, 2:41 PM EDTSevere Thunderstorm WarningPHIOcean19 min
Aug 6, 2:55 PM EDTSpecial Marine WarningPHI65 min
Aug 6, 3:15 PM EDTSpecial Marine WarningPHI60 min
Aug 6, 3:18 PM EDTSevere Thunderstorm WarningPHIMonmouth27 min
Aug 6, 3:21 PM EDTSevere Thunderstorm WarningPHIBurlington23 min
Aug 6, 3:23 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth37 min
Aug 6, 3:45 PM EDTFlash Flood WarningPHIMiddlesex, Monmouth2 hr
Aug 6, 3:49 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth56 min
Aug 6, 4:10 PM EDTSpecial Marine WarningPHI65 min
Aug 6, 4:13 PM EDTFlash Flood WarningPHIMercer, Middlesex, Monmouth8 hr
Aug 6, 4:32 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Somerset43 min
Aug 6, 4:37 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset40 min
Aug 6, 4:55 PM EDTFlash Flood Warning Considerable damage threatPHIMonmouth6 hr
Aug 6, 4:56 PM EDTSevere Thunderstorm WarningPHIOcean49 min
Aug 6, 5:06 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset54 min
Aug 6, 5:29 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset6 hr
Aug 6, 5:36 PM EDTFlash Flood WarningPHIMonmouth, Ocean8 hr
Aug 6, 6:37 PM EDTFlash Flood WarningPHIWarren3 hr
Aug 6, 6:39 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester5 hr
Aug 6, 6:46 PM EDTFlash Flood WarningPHIMorris, Somerset4 hr
Aug 6, 6:57 PM EDTFlash Flood WarningPHIWarren3 hr
Aug 6, 7:04 PM EDTFlash Flood WarningPHIBurlington5 hr

Nearby

Flash Flood Warnings in New Jersey, 2024Every flash flood warning in 2024

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.