Alert archive / New Jersey / Flash Flood Warnings in 2021

Flash Flood Warning 79, NWS Philadelphia/Mount Holly

September 1, 2021Burlington County, Camden County, Gloucester County, New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 1, 2021, 10:24 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; Bucks County, Philadelphia County, Pennsylvania. 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
Sep 1, 2021, 10:24 PM EDT (02:24 UTC)
Expired
Sep 2, 2021, 2:30 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 52 km from the middle of the area, began a volume at 02:23 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
Sep 2, 12:13 AM EDTFLASH FLOOD1 Ne Bristol, PAGREEN LANE CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT.
Sep 2, 12:33 AM EDTFLASH FLOOD1 Nnw Collingswood, NJU.S. HIGHWAY 30 CLOSED AT AIRPORT CIRCLE FROM FLOODING. TIME BASED ON DISPATCH REPORT.

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, 2.4 hours before the alert went out and 210 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 00:00Z on 2021-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 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 00:00Z on 2021-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 279 square meters per square second.19395878Sfc1 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
123 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
512 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
279 m²/s²
0-3 km storm-relative helicity
456 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

As transmitted.

838 
WGUS51 KPHI 020224
FFWPHI
NJC005-007-015-PAC017-101-020630-
/O.NEW.KPHI.FF.W.0079.210902T0224Z-210902T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1024 PM EDT Wed Sep 1 2021

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Burlington County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Southeastern Philadelphia County in southeastern Pennsylvania...

* Until 230 AM EDT.

* At 1024 PM EDT, local law enforcement reported flash flooding 
  across the warned area. Several roads are closed in Westville, and 
  flooding is occurring near the Delaware River in Burlington 
  County. Between 1 and 3 inches of rain have fallen. Flash flooding 
  is already occurring.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Law enforcement 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...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Mount Laurel, 
  Willingboro, Deptford, West Deptford, Florence, Bellmawr, 
  Woodbury, and Burlington.

This includes the following highways...
	New Jersey Turnpike between exits 2 and 6A.
	Pennsylvania Turnpike near mile marker 359.
	Interstate 95 in Pennsylvania between mile markers 17 and 18.
	Interstate 76 in Pennsylvania near mile marker 351.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 16 and 55.
	Interstate 676 in New Jersey between mile markers 0 and 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7519 4007 7492 4013 7483 4015 7473
      4008 7472 3979 7508 3970 7519 3977 7534

FLASH FLOOD...OBSERVED

$$

CMS
2 follow-up statements
918 
WGUS71 KPHI 020307
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1107 PM EDT Wed Sep 1 2021

NJC005-007-015-PAC017-101-020630-
/O.CON.KPHI.FF.W.0079.000000T0000Z-210902T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Philadelphia PA-
1107 PM EDT Wed Sep 1 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM EDT THURSDAY 
FOR NORTHWESTERN BURLINGTON, NORTHWESTERN CAMDEN, NORTHWESTERN 
GLOUCESTER, SOUTHEASTERN BUCKS, AND SOUTHEASTERN PHILADELPHIA 
COUNTIES...

At 1107 PM EDT, local law enforcement reported flash flooding across 
the warned area. Several roads are closed in Camden, Westville, and 
Palmyra. Between 1 and 3 inches of rain have fallen. Flash flooding 
is already occurring.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Law enforcement 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...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Mount Laurel, 
  Willingboro, Deptford, West Deptford, Florence, Bellmawr, 
  Woodbury, and Burlington.

This includes the following highways...
	New Jersey Turnpike between exits 2 and 6A.
	Pennsylvania Turnpike near mile marker 359.
	Interstate 95 in Pennsylvania between mile markers 17 and 18.
	Interstate 76 in Pennsylvania near mile marker 351.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 16 and 55.
	Interstate 676 in New Jersey between mile markers 0 and 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7519 4007 7492 4013 7483 4015 7473
      4008 7472 3979 7508 3970 7519 3977 7534

FLASH FLOOD...OBSERVED

$$

CMS
198 
WGUS71 KPHI 020630
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
230 AM EDT Thu Sep 2 2021

NJC005-007-015-PAC017-101-020640-
/O.EXP.KPHI.FF.W.0079.000000T0000Z-210902T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Bucks PA-Philadelphia PA-
230 AM EDT Thu Sep 2 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHWESTERN BURLINGTON, 
NORTHWESTERN CAMDEN, NORTHWESTERN GLOUCESTER, SOUTHEASTERN BUCKS, 
AND SOUTHEASTERN PHILADELPHIA COUNTIES...

The flash flood warning has been replaced by a flood warning. Please 
refer to that bulletin for more information.

LAT...LON 3988 7519 4007 7492 4013 7483 4015 7473
      4008 7472 3979 7508 3970 7519 3977 7534

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 8:02 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIMiddlesex, Morris, Somerset5 hr
Sep 1, 9:01 PM EDTFlash Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean5 hr
Sep 1, 9:43 PM EDTRiver Flood WarningPHIMercer33 hr
Sep 1, 10:05 PM EDTFlash Flood Warning Considerable damage threatPHIMorris, Somerset4 hr
Sep 1, 10:23 PM EDTCoastal Flood StatementPHIOcean13 hr
Sep 1, 10:29 PM EDTRiver Flood WarningPHIHunterdon, Mercer49 hr
Sep 1, 10:32 PM EDTRiver Flood WarningPHIMercer31 hr
Sep 1, 10:35 PM EDTRiver Flood WarningPHIBergen, Morris, Passaic30 hr
Sep 1, 10:37 PM EDTRiver Flood WarningPHIMorris, Passaic41 hr
Sep 1, 10:38 PM EDTRiver Flood WarningPHIMorris, Somerset21 days
Sep 1, 10:47 PM EDTAreal Flood WarningPHIWarren23 hr
Sep 1, 10:52 PM EDTAreal Flood WarningPHIHunterdon, Warren12 hr
Sep 2, 12:01 AM EDTAreal Flood WarningPHIHunterdon, Morris, Sussex, Warren40 hr
Sep 2, 12:28 AM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Gloucester3 hr
Sep 2, 12:31 AM EDTAreal Flood AdvisoryPHIMonmouth, Ocean2 hr
Sep 2, 1:38 AM EDTAreal Flood WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean4 hr
Sep 2, 1:52 AM EDTAreal Flood WarningPHIMorris, Somerset13 hr
Sep 2, 2:23 AM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester, Salem9 hr
Sep 2, 2:29 AM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester5 hr
Sep 2, 3:52 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Warren8 hr
Sep 2, 3:53 AM EDTAreal Flood WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset8 hr
Sep 2, 4:00 AM EDTRiver Flood WarningPHIMorris48 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Mercer37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Warren37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon37 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon33 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHIHunterdon, Mercer34 hr
Sep 2, 4:45 AM EDTRiver Flood WarningPHISussex, Warren5 hr
Sep 2, 6:05 AM EDTCoastal Flood WarningPHIBurlington, Camden, Gloucester, Mercer6 hr
Sep 2, 1:20 PM EDTAreal Flood WarningPHIMiddlesex21 hr
Sep 2, 6:44 PM EDTCoastal Flood AdvisoryPHIBurlington, Camden, Gloucester7 hr
Sep 1, 8:29 PM EDTRiver Flood WarningPHILehigh10 hr
Sep 1, 9:47 PM EDTRiver Flood WarningPHIBerks18 hr
Sep 1, 10:42 PM EDTAreal Flood WarningPHIBerks, Bucks, Montgomery12 hr
Sep 1, 11:38 PM EDTAreal Flood WarningPHIBerks, Chester, Delaware, Montgomery10 hr
Sep 2, 2:41 AM EDTAreal Flood WarningPHIBucks14 hr
Sep 2, 5:02 AM EDTRiver Flood WarningPHILehigh11 hr

Nearby

Flash Flood Warnings in New Jersey, 2021Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021

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.