Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 81, NWS Philadelphia/Mount Holly

September 9, 2023Burlington County, Camden County, Gloucester County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 9, 2023, 4:05 PM EDT for Burlington County, Camden County, Gloucester County, New Jersey; 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 9, 2023, 4:05 PM EDT (20:05 UTC)
Expired: Sep 9, 2023, 8:15 PM 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, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 57 km from the middle of the area, began a volume at 20:08 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
Sep 9, 4:40 PM EDT	FLASH FLOOD	Bellmawr, NJ	NWS employee reports flash flooding on I-295 at exit 28 with 1-2 feet of water covering the southbound roadway. Flooding at exit 29 as well.
Sep 9, 5:12 PM EDT	FLOOD	1 Wsw Audubon, NJ	Flooding at Route 130 and Route 42.

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, 8.1 hours before the alert went out and 215 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: 1962 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

012 
WGUS51 KPHI 092005
FFWPHI
NJC005-007-015-PAC101-100015-
/O.NEW.KPHI.FF.W.0081.230909T2005Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
405 PM EDT Sat Sep 9 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  West Central Burlington County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  North Central Gloucester County in southern New Jersey...
  Central Philadelphia County in southeastern Pennsylvania...

* Until 815 PM EDT.

* At 405 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 1.5 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...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...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, 
  Lindenwold, Bellmawr, Woodbury, Palmyra, Magnolia, Westville, and 
  Woodbury Heights.

This includes the following highways...
	New Jersey Turnpike near exit 3.
	Interstate 95 in Pennsylvania between mile markers 15 and 29.
	Interstate 76 in Pennsylvania between mile markers 349 and 351.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 22 and 36.
	Interstate 676 in Pennsylvania near mile marker 1.
	Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3996 7518 4001 7513 4004 7508 4002 7503
      3999 7500 3997 7499 3991 7495 3987 7496
      3980 7499 3978 7506 3979 7510 3981 7516
      3986 7520

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-1.5 INCHES IN 1 HOUR

$$

Staarmann

4 follow-up statements

864 
WGUS71 KPHI 092023
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
423 PM EDT Sat Sep 9 2023

NJC005-007-015-PAC101-100015-
/O.CON.KPHI.FF.W.0081.000000T0000Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Philadelphia PA-
423 PM EDT Sat Sep 9 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS 
EVENING FOR WEST CENTRAL BURLINGTON, NORTHWESTERN CAMDEN, NORTH 
CENTRAL GLOUCESTER, AND CENTRAL PHILADELPHIA COUNTIES...

At 423 PM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 1 
and 3 inches of rain have fallen. The expected rainfall rate is 1 to 
2 inches in 1 hour. Additional rainfall amounts of 0.5 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 and automated gauges.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets, and underpasses.

Some locations that may experience flash flooding include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, 
  Lindenwold, Bellmawr, Woodbury, Palmyra, Magnolia, Westville, and 
  Woodbury Heights.

This includes the following highways...
	New Jersey Turnpike near exit 3.
	Interstate 95 in Pennsylvania between mile markers 15 and 29.
	Interstate 76 in Pennsylvania between mile markers 349 and 351.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 22 and 36.
	Interstate 676 in Pennsylvania near mile marker 1.
	Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3996 7518 4001 7513 4004 7508 4002 7503
      3999 7500 3997 7499 3991 7495 3987 7496
      3980 7499 3978 7506 3979 7510 3981 7516
      3986 7520

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

$$

Staarmann

732 
WGUS71 KPHI 092105
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
505 PM EDT Sat Sep 9 2023

NJC005-007-015-PAC101-100015-
/O.CON.KPHI.FF.W.0081.000000T0000Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Gloucester NJ-Philadelphia PA-
505 PM EDT Sat Sep 9 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS 
EVENING FOR WEST CENTRAL BURLINGTON, NORTHWESTERN CAMDEN, NORTH 
CENTRAL GLOUCESTER, AND CENTRAL PHILADELPHIA COUNTIES...

At 505 PM EDT, an NWS employee reported thunderstorms with heavy 
rain producing flash flooding on I-295 in Bellmawr. Between 1 and 
3.5 inches of rain have fallen. The expected rainfall rate is 0.5 to 
1 inch in 1 hour. Additional rainfall amounts of 0.5 to 1 inch are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Life threatening flash flooding caused by thunderstorms.

SOURCE...NWS employee.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets, and underpasses.

Some locations that may experience flash flooding include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, 
  Lindenwold, Bellmawr, Woodbury, Palmyra, Magnolia, Westville, and 
  Woodbury Heights.

This includes the following highways...
	New Jersey Turnpike near exit 3.
	Interstate 95 in Pennsylvania between mile markers 15 and 29.
	Interstate 76 in Pennsylvania between mile markers 349 and 351.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 22 and 36.
	Interstate 676 in Pennsylvania near mile marker 1.
	Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3996 7518 4001 7513 4004 7508 4002 7503
      3999 7500 3997 7499 3991 7495 3987 7496
      3980 7499 3978 7506 3979 7510 3981 7516
      3986 7520

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...0.5-1 INCH IN 1 HOUR

$$

Staarmann

142 
WGUS71 KPHI 092153
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
553 PM EDT Sat Sep 9 2023

NJC005-PAC101-092203-
/O.CAN.KPHI.FF.W.0081.000000T0000Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Philadelphia PA-
553 PM EDT Sat Sep 9 2023

...FLASH FLOOD WARNING IS CANCELLED FOR WEST CENTRAL BURLINGTON AND 
CENTRAL PHILADELPHIA COUNTIES...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 3990 7513 3991 7513 3994 7514 3996 7513
      3999 7505 3999 7503 3998 7501 3997 7502
      3995 7501 3994 7498 3993 7498 3992 7496
      3990 7495 3980 7499 3978 7506 3981 7516
      3986 7520 3988 7520 3988 7519 3988 7515

$$

NJC007-015-100015-
/O.CON.KPHI.FF.W.0081.000000T0000Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-
553 PM EDT Sat Sep 9 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS 
EVENING FOR NORTHWESTERN CAMDEN AND NORTH CENTRAL GLOUCESTER 
COUNTIES...

At 553 PM EDT, an NWS employee reported thunderstorms with heavy 
rain producing flash flooding on I-295 in Bellmawr. Between 1 and 
3.5 inches of rain have fallen. The expected rainfall rate is 0.5 to 
1 inch in 1 hour. Additional rainfall amounts of 0.5 to 1 inch are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Life threatening flash flooding caused by thunderstorms.

SOURCE...NWS employee.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets, and underpasses.

Some locations that may experience flash flooding include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Deptford, 
  Lindenwold, Bellmawr, Woodbury, Magnolia, Westville, Woodbury 
  Heights, and National Park.

This includes the following highways...
	New Jersey Turnpike near exit 3.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 22 and 35.
	Interstate 676 in New Jersey between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3990 7513 3991 7513 3994 7514 3996 7513
      3999 7505 3999 7503 3998 7501 3997 7502
      3995 7501 3994 7498 3993 7498 3992 7496
      3990 7495 3980 7499 3978 7506 3981 7516
      3986 7520 3988 7520 3988 7519 3988 7515

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Staarmann

643 
WGUS71 KPHI 100011
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
811 PM EDT Sat Sep 9 2023

NJC007-015-100021-
/O.EXP.KPHI.FF.W.0081.000000T0000Z-230910T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-
811 PM EDT Sat Sep 9 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR 
NORTHWESTERN CAMDEN AND NORTH CENTRAL GLOUCESTER COUNTIES...

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

LAT...LON 3990 7513 3991 7513 3994 7514 3996 7513
      3999 7505 3999 7503 3998 7501 3997 7502
      3995 7501 3994 7498 3993 7498 3992 7496
      3990 7495 3980 7499 3978 7506 3981 7516
      3986 7520 3988 7520 3988 7519 3988 7515

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 10:17 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	43 min
Sep 8, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	47 min
Sep 9, 12:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	64 min
Sep 9, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	50 min
Sep 9, 1:17 PM EDT	Special Weather Statement	PHI	Ocean	28 min
Sep 9, 1:46 PM EDT	Special Weather Statement	PHI	Ocean	29 min
Sep 9, 2:07 PM EDT	Special Weather Statement	PHI	Atlantic	38 min
Sep 9, 2:16 PM EDT	Special Weather Statement	PHI	Burlington	29 min
Sep 9, 2:26 PM EDT	Special Weather Statement	PHI	Middlesex	34 min
Sep 9, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth, Somerset	48 min
Sep 9, 3:09 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Middlesex, Somerset	49 min
Sep 9, 3:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Sep 9, 3:40 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	2 hr
Sep 9, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Morris	43 min
Sep 9, 3:58 PM EDT	Special Weather Statement	PHI	Somerset	32 min
Sep 9, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset, Sussex	53 min
Sep 9, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	53 min
Sep 9, 4:40 PM EDT	Special Marine Warning	PHI		65 min
Sep 9, 4:42 PM EDT	Areal Flood Advisory	PHI	Morris	3 hr
Sep 9, 4:49 PM EDT	Special Weather Statement	PHI	Warren	41 min
Sep 9, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	49 min
Sep 9, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	45 min
Sep 9, 5:34 PM EDT	Special Weather Statement	PHI	Salem	26 min
Sep 8, 9:33 PM EDT	Special Weather Statement	PHI	Chester	27 min
Sep 8, 9:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester	42 min
Sep 8, 10:33 PM EDT	Special Weather Statement	PHI	Berks	27 min
Sep 8, 11:07 PM EDT	Special Weather Statement	PHI	Carbon	53 min
Sep 9, 4:15 PM EDT	Special Weather Statement	PHI	Bucks	30 min
Sep 9, 4:29 PM EDT	Special Weather Statement	PHI	Philadelphia	31 min
Sep 9, 5:36 PM EDT	Special Weather Statement	PHI	Berks	24 min
Sep 9, 5:43 PM EDT	Special Weather Statement	PHI	Lehigh	32 min
Sep 9, 6:38 PM EDT	Special Weather Statement	PHI	Chester	37 min
Sep 9, 7:20 PM EDT	Special Weather Statement	PHI	Chester	25 min
Sep 9, 7:24 PM EDT	Special Weather Statement	PHI	Berks	36 min
Sep 9, 7:25 PM EDT	Special Weather Statement	PHI	Lehigh	35 min
Sep 9, 7:56 PM EDT	Special Weather Statement	PHI	Berks	64 min

Nearby

Flash Flood Warnings in New Jersey, 2023 Flash Flood Warnings in Pennsylvania, 2023 Every flash flood warning in 2023

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.