Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

June 25, 2023Burlington County, Camden County, New Jersey; Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 25, 2023, 4:01 PM EDT for Burlington County, Camden County, New Jersey; Montgomery County, Philadelphia County, Pennsylvania. It was in force for 4 hr. 9 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: Jun 25, 2023, 4:01 PM EDT (20:01 UTC)
Expired: Jun 25, 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, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 20:04 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
Jun 25, 4:25 PM EDT	FLASH FLOOD	1 Nnw Holmesburg, PA	The Pennypack Creek gauge in Philadelphia reached minor flood stage in just 23 minutes. It eventually crested in moderate flood stage at 9.66 feet at 450 PM.
Jun 25, 4:25 PM EDT	FLASH FLOOD	1 Nnw Holmesburg, PA	The Pennypack Creek gauge in Philadelphia reached minor flood stage in just 23 minutes. It eventually crested in moderate flood stage at 9.66 feet at 450 PM.
Jun 25, 4:30 PM EDT	FLOOD	1 Nne Bridesburg, PA	Report that at the base of Tacony Street and Milnor Streets were flooded earlier. Time estimated via radar.
Jun 25, 4:53 PM EDT	FLOOD	1 Nw Cherry Hill Twp, NJ	Flooding on NJ 38 westbound East of CR 62 and Longwood Ave. All lanes closed.
Jun 25, 4:53 PM EDT	FLOOD	1 Nw Cherry Hill Twp, NJ	Flooding on NJ 38 westbound East of CR 62 and Longwood Ave. All lanes closed.
Jun 25, 5:16 PM EDT	FLOOD	Haddonfield, NJ	Picture of street flooding in Haddonfield.
Jun 25, 5:16 PM EDT	FLOOD	Haddonfield, NJ	Picture of street flooding in Haddonfield.
Jun 25, 5:32 PM EDT	FLOOD	1 S West Haddonfield, NJ	Report of roads impassible due to flooding at the intersection of Clements Bridge Road and Summit/Station Ave in Haddonfield.
Jun 25, 5:32 PM EDT	FLOOD	1 S West Haddonfield, NJ	Report of roads impassible due to flooding at the intersection of Clements Bridge Road and Summit/Station Ave in Haddonfield.

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, 8.0 hours before the alert went out and 206 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

342 
WGUS51 KPHI 252001
FFWPHI
NJC005-007-PAC091-101-260015-
/O.NEW.KPHI.FF.W.0010.230625T2001Z-230626T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
401 PM EDT Sun Jun 25 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...
  East Central Montgomery County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 815 PM EDT.

* At 401 PM EDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 1.5 inches of rain have fallen. The expected rainfall rate 
  is 1 to 2 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, Palmyra, Jenkintown, Rockledge, Bryn Athyn, 
  Tacony, Wissinoming, Holmesburg, Northeast Philadelphia, Cherry 
  Hill Mall, and Golden Triangle.

This includes the following highways...
	Interstate 95 in Pennsylvania between mile markers 25 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7513 4016 7508 4016 7505 4012 7499
      4007 7498 4006 7498 4005 7497 3996 7499
      3988 7503 3990 7509 3997 7510 4003 7515

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

$$

Staarmann

4 follow-up statements

032 
WGUS71 KPHI 252024
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
424 PM EDT Sun Jun 25 2023

NJC005-007-PAC091-101-260015-
/O.CON.KPHI.FF.W.0010.000000T0000Z-230626T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Montgomery PA-Philadelphia PA-
424 PM EDT Sun Jun 25 2023

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

At 424 PM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 
1.5 and 2.5 inches of rain have fallen. The expected rainfall rate 
is 1 to 2 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 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, Palmyra, Jenkintown, Rockledge, Bryn Athyn, 
  Tacony, Wissinoming, Holmesburg, Northeast Philadelphia, Cherry 
  Hill Mall, and Golden Triangle.

This includes the following highways...
	Interstate 95 in Pennsylvania between mile markers 25 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7513 4016 7508 4016 7505 4012 7499
      4007 7498 4006 7498 4005 7497 3996 7499
      3988 7503 3990 7509 3997 7510 4003 7515

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

$$

Staarmann

747 
WGUS71 KPHI 252115
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
515 PM EDT Sun Jun 25 2023

NJC005-007-PAC091-101-260015-
/O.CON.KPHI.FF.W.0010.000000T0000Z-230626T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Montgomery PA-Philadelphia PA-
515 PM EDT Sun Jun 25 2023

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

At 515 PM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 
1.5 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 1 
inch 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, Palmyra, Jenkintown, Rockledge, Bryn Athyn, 
  Tacony, Wissinoming, Holmesburg, Northeast Philadelphia, Cherry 
  Hill Mall, and Golden Triangle.

This includes the following highways...
	Interstate 95 in Pennsylvania between mile markers 25 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7513 4016 7508 4016 7505 4012 7499
      4007 7498 4006 7498 4005 7497 3996 7499
      3988 7503 3990 7509 3997 7510 4003 7515

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

$$

Staarmann

470 
WGUS71 KPHI 252237
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
637 PM EDT Sun Jun 25 2023

NJC005-007-PAC091-101-260015-
/O.CON.KPHI.FF.W.0010.000000T0000Z-230626T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Montgomery PA-Philadelphia PA-
637 PM EDT Sun Jun 25 2023

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

At 637 PM EDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 
1.5 and 3 inches of rain have fallen. Additional rainfall amounts up 
to 0.5 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...
  Northeast Philadelphia, Camden, Palmyra, Jenkintown, Rockledge, 
  Bryn Athyn, Tacony, Wissinoming, Holmesburg, Cherry Hill Mall, and 
  Golden Triangle.

This includes the following highways...
	Interstate 95 in Pennsylvania between mile markers 25 and 33.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7513 4016 7508 4016 7505 4012 7499
      4007 7498 4006 7498 4005 7497 3996 7499
      3988 7503 3990 7509 3997 7510 4003 7515

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Staarmann

079 
WGUS71 KPHI 260006 RRA
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
806 PM EDT Sun Jun 25 2023

NJC005-007-PAC091-101-260016-
/O.EXP.KPHI.FF.W.0010.000000T0000Z-230626T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Camden NJ-Montgomery PA-Philadelphia PA-
806 PM EDT Sun Jun 25 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR 
WEST CENTRAL BURLINGTON, NORTHWESTERN CAMDEN, EAST CENTRAL 
MONTGOMERY, AND NORTHEASTERN PHILADELPHIA COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

LAT...LON 4010 7513 4016 7508 4016 7505 4012 7499
      4007 7498 4006 7498 4005 7497 3996 7499
      3988 7503 3990 7509 3997 7510 4003 7515

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 8:13 PM EDT	Special Weather Statement	PHI	Warren	32 min
Jun 24, 8:18 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Jun 25, 11:26 AM EDT	Special Weather Statement	PHI	Ocean	34 min
Jun 25, 12:20 PM EDT	Special Weather Statement	PHI	Ocean	25 min
Jun 25, 12:32 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Ocean	28 min
Jun 25, 12:50 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	3 hr
Jun 25, 2:25 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Jun 25, 3:09 PM EDT	Special Weather Statement	PHI	Hunterdon	36 min
Jun 25, 3:18 PM EDT	Areal Flood Advisory	PHI	Hunterdon	3 hr
Jun 25, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	25 min
Jun 25, 4:52 PM EDT	Special Weather Statement	PHI	Camden	23 min
Jun 25, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	33 min
Jun 25, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	32 min
Jun 25, 5:22 PM EDT	Flash Flood Warning	PHI	Camden	3 hr
Jun 25, 5:43 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	32 min
Jun 25, 6:13 PM EDT	Special Weather Statement	PHI	Burlington, Camden	32 min
Jun 25, 6:21 PM EDT	Special Weather Statement	PHI	Somerset	24 min
Jun 25, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	34 min
Jun 25, 6:31 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	29 min
Jun 25, 6:53 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	37 min
Jun 25, 6:57 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	3 hr
Jun 25, 7:20 PM EDT	Special Weather Statement	PHI	Monmouth	25 min
Jun 25, 7:35 PM EDT	Special Weather Statement	PHI	Middlesex	25 min
Jun 24, 9:19 PM EDT	Areal Flood Advisory	PHI	Northampton	101 min
Jun 25, 2:55 PM EDT	Special Weather Statement	PHI	Philadelphia	35 min
Jun 25, 3:24 PM EDT	Special Weather Statement	PHI	Philadelphia	36 min
Jun 25, 3:47 PM EDT	Areal Flood Advisory	PHI	Montgomery, Philadelphia	15 min
Jun 25, 4:01 PM EDT	Special Weather Statement	PHI	Philadelphia	29 min
Jun 25, 4:11 PM EDT	Special Weather Statement	PHI	Delaware	34 min
Jun 25, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	44 min
Jun 25, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Chester	33 min
Jun 25, 4:47 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Northampton	3 hr
Jun 25, 4:51 PM EDT	Areal Flood Advisory	PHI	Berks, Chester	3 hr
Jun 25, 5:27 PM EDT	Areal Flood Advisory	PHI	Delaware, Montgomery, Philadelphia	3 hr
Jun 25, 5:35 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	3 hr
Jun 25, 5:56 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr

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.