Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 11, NWS Philadelphia/Mount Holly

June 25, 2023Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 25, 2023, 5:22 PM EDT for Camden County, New Jersey. It was in force for 3 hr. 6 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, 5:22 PM EDT (21:22 UTC)
Expired: Jun 25, 2023, 8:06 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Camden County, NJ

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 21:22 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, 5:30 PM EDT	FLOOD	1 Sse Lindenwold, NJ	Report of street flooding all along Route 30 in Lindenwold.
Jun 25, 5:30 PM EDT	FLOOD	1 Sse Lindenwold, NJ	Report of street flooding all along Route 30 in Lindenwold.
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.
Jun 25, 5:35 PM EDT	FLOOD	Laurel Springs, NJ	Report of impassible road due to flooding at intersection of Strafford Ave and Atlantic Ave.
Jun 25, 5:35 PM EDT	FLOOD	Laurel Springs, NJ	Report of impassible road due to flooding at intersection of Strafford Ave and Atlantic Ave.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 9.4 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: 435 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

687 
WGUS51 KPHI 252122
FFWPHI
NJC007-260130-
/O.NEW.KPHI.FF.W.0011.230625T2122Z-230626T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
522 PM EDT Sun Jun 25 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northwestern Camden County in southern New Jersey...

* Until 930 PM EDT.

* At 522 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 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...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Voorhees, 
  Lindenwold, Bellmawr, Berlin, Magnolia, Westville, Brooklawn, and 
  Audubon 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 26 and 35.
	Interstate 676 in New Jersey between mile markers 0 and 4.
	Atlantic City Expressway between mile markers 40 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3978 7489 3971 7500 3973 7502 3975 7502
      3978 7505 3978 7509 3979 7507 3982 7509
      3984 7508 3989 7514 3991 7513 3996 7513
      3997 7510 3991 7508 3989 7503 3995 7501
      3993 7498 3989 7493

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

$$

Staarmann

2 follow-up statements

751 
WGUS71 KPHI 252207
FFSPHI

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

NJC007-260130-
/O.CON.KPHI.FF.W.0011.000000T0000Z-230626T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-
607 PM EDT Sun Jun 25 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS 
EVENING FOR NORTHWESTERN CAMDEN COUNTY...

At 607 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. 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...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Voorhees, 
  Lindenwold, Bellmawr, Berlin, Magnolia, Westville, Brooklawn, and 
  Audubon 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 27 and 35.
	Interstate 676 in New Jersey between mile markers 0 and 4.
	Atlantic City Expressway between mile markers 39 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3978 7489 3971 7499 3973 7502 3975 7502
      3978 7505 3979 7507 3982 7509 3984 7508
      3989 7514 3991 7513 3996 7513 3997 7510
      3991 7508 3989 7503 3994 7501 3993 7498
      3989 7493 3979 7490

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Staarmann

078 
WGUS71 KPHI 260006
FFSPHI

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

NJC007-260016-
/O.CAN.KPHI.FF.W.0011.000000T0000Z-230626T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-
806 PM EDT Sun Jun 25 2023

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN CAMDEN COUNTY...

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

LAT...LON 3978 7489 3971 7499 3973 7502 3975 7502
      3978 7505 3979 7507 3982 7509 3984 7508
      3989 7514 3991 7513 3996 7513 3997 7510
      3991 7508 3989 7503 3994 7501 3993 7498
      3989 7493 3979 7490

$$

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, 4:01 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	4 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, 5:43 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

Nearby

Flash Flood Warnings in New Jersey, 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.