Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 26, NWS Philadelphia/Mount Holly

July 3, 2023Salem County, New Jersey; Chester County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 3, 2023, 9:07 PM EDT for Salem County, New Jersey; Chester County, Pennsylvania; New Castle County, Delaware. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 3, 2023, 9:07 PM EDT (01:07 UTC)
Expired: Jul 4, 2023, 2:00 AM EDT
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Salem County, NJ, Chester County, PA

The radar

The Dover AFB radar (KDOX), 102 km from the middle of the area, began a volume at 01:11 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.1 hours before the alert went out and 179 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: 1174 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1237 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted.

748 
WGUS51 KPHI 040107
FFWPHI
DEC003-NJC033-PAC029-040400-
/O.NEW.KPHI.FF.W.0026.230704T0107Z-230704T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
907 PM EDT Mon Jul 3 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  South Central Chester County in southeastern Pennsylvania...

* Until midnight EDT.

* At 907 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to 1 inch of rain has 
  fallen. 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.

  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...
  Wilmington, Newark, Middletown, Pennsville, Carneys Point, 
  Elsmere, New Castle, Penns Grove, Salem, Delaware City, Newport, 
  and Arden.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 0 and 23.
	Interstate 295 in New Jersey between mile markers 0 and 6.

This includes the following streams and drainages...
  Brandywine-Christina, Cohansey-Maurice, Chester-Sassafras, and 
  Lower Delaware.

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 3973 7580 3985 7566 3984 7560 3983 7550
      3982 7545 3980 7541 3978 7544 3979 7541
      3978 7540 3976 7541 3976 7540 3951 7551
      3946 7577 3965 7579 3972 7579 3972 7580

FLASH FLOOD...RADAR INDICATED

$$

AKL

3 follow-up statements

607 
WGUS71 KPHI 040215
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1015 PM EDT Mon Jul 3 2023

DEC003-NJC033-PAC029-040400-
/O.CON.KPHI.FF.W.0026.000000T0000Z-230704T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Salem NJ-Chester PA-
1015 PM EDT Mon Jul 3 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT 
FOR NEW CASTLE, NORTHWESTERN SALEM, AND SOUTH CENTRAL CHESTER 
COUNTIES...

At 1015 PM EDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 0.5 and 2 inches of rain 
have fallen. Additional rainfall amounts up to 1 inch are possible 
in the warned area. Flash flooding is ongoing or expected to begin 
shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

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...
  Wilmington, Newark, Middletown, Pennsville, Carneys Point, 
  Elsmere, New Castle, Penns Grove, Salem, Delaware City, Newport, 
  and Arden.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 0 and 23.
	Interstate 295 in New Jersey between mile markers 0 and 6.

This includes the following streams and drainages...
  Brandywine-Christina, Cohansey-Maurice, Chester-Sassafras, and 
  Lower Delaware.

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 3973 7580 3985 7566 3984 7560 3983 7550
      3982 7545 3980 7541 3978 7544 3979 7541
      3978 7540 3976 7541 3976 7540 3951 7551
      3946 7577 3965 7579 3972 7579 3972 7580

FLASH FLOOD...RADAR INDICATED

$$

AKL

012 
WGUS51 KPHI 040344
FFWPHI
DEC003-NJC033-PAC029-040600-
/O.EXT.KPHI.FF.W.0026.000000T0000Z-230704T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1144 PM EDT Mon Jul 3 2023

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  New Castle County in northern Delaware...
  Northwestern Salem County in southern New Jersey...
  South Central Chester County in southeastern Pennsylvania...

* Until 200 AM EDT.

* At 1144 PM EDT, Doppler radar indicated thunderstorms have 
  produced heavy rain across the warned area. Between 2 and 3 inches 
  of rain have fallen. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Wilmington, Newark, Middletown, Pennsville, Carneys Point, 
  Elsmere, New Castle, Penns Grove, Salem, Delaware City, Newport, 
  and Arden.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 0 and 23.
	Interstate 295 in New Jersey between mile markers 0 and 6.

This includes the following streams and drainages...
  Lower Delaware, Chester-Sassafras, Cohansey-Maurice, and 
  Brandywine-Christina.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

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 3973 7580 3985 7566 3984 7560 3983 7550
      3982 7545 3980 7541 3978 7544 3979 7541
      3978 7540 3976 7541 3976 7540 3951 7551
      3946 7577 3965 7579 3972 7579 3972 7580

FLASH FLOOD...RADAR INDICATED

$$

MPS

028 
WGUS71 KPHI 040552
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
152 AM EDT Tue Jul 4 2023

DEC003-NJC033-PAC029-040602-
/O.EXP.KPHI.FF.W.0026.000000T0000Z-230704T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Salem NJ-Chester PA-
152 AM EDT Tue Jul 4 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 2 AM EDT EARLY THIS MORNING 
FOR NEW CASTLE, NORTHWESTERN SALEM, AND SOUTH CENTRAL CHESTER 
COUNTIES...

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

LAT...LON 3973 7580 3985 7566 3984 7560 3983 7550
      3982 7545 3980 7541 3978 7544 3979 7541
      3978 7540 3976 7541 3976 7540 3951 7551
      3946 7577 3965 7579 3972 7579 3972 7580

$$

MPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 8:27 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	48 min
Jul 3, 8:34 PM EDT	Special Marine Warning	PHI		116 min
Jul 3, 8:41 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	49 min
Jul 3, 8:50 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	115 min
Jul 3, 8:58 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	47 min
Jul 3, 9:02 PM EDT	Special Marine Warning	PHI		118 min
Jul 3, 9:22 PM EDT	Areal Flood Advisory	PHI	Morris	83 min
Jul 3, 9:25 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	35 min
Jul 3, 9:52 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	38 min
Jul 3, 10:36 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	4 hr
Jul 4, 1:58 PM EDT	Special Weather Statement	PHI	Monmouth	32 min
Jul 4, 2:51 PM EDT	Special Weather Statement	PHI	Middlesex	24 min
Jul 4, 2:58 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	3 hr
Jul 4, 3:09 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	2 hr
Jul 4, 3:16 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Monmouth	29 min
Jul 4, 3:19 PM EDT	Special Weather Statement	PHI	Passaic	26 min
Jul 4, 3:22 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	38 min
Jul 4, 3:34 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth, Somerset	2 hr
Jul 4, 3:45 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	45 min
Jul 4, 3:52 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	38 min
Jul 4, 4:11 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Ocean	2 hr
Jul 4, 4:19 PM EDT	Special Marine Warning	PHI		56 min
Jul 4, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Monmouth, Ocean	36 min
Jul 4, 4:26 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	23 min
Jul 4, 4:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Monmouth, Ocean	2 hr
Jul 4, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Ocean	46 min
Jul 4, 5:23 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	112 min
Jul 4, 5:30 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	33 min
Jul 4, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	46 min
Jul 4, 5:46 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	3 hr
Jul 4, 6:02 PM EDT	Special Weather Statement	PHI	Middlesex	28 min
Jul 4, 6:06 PM EDT	Areal Flood Advisory	PHI	Warren	114 min
Jul 4, 6:29 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Camden, Gloucester	21 min
Jul 4, 7:05 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	2 hr
Jul 3, 8:04 PM EDT	Areal Flood Advisory	PHI	Chester	35 min
Jul 3, 8:04 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	41 min
Jul 3, 8:39 PM EDT	Flash Flood Warning	PHI	Chester	5 hr
Jul 4, 6:30 PM EDT	Areal Flood Advisory	PHI	Philadelphia	3 hr
Jul 4, 6:53 PM EDT	Special Weather Statement	PHI	Delaware	37 min
Jul 3, 8:31 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	3 hr
Jul 3, 8:37 PM EDT	Special Weather Statement	PHI	Sussex	23 min
Jul 3, 10:48 PM EDT	River Flood Warning	PHI	New Castle	4 hr

Nearby

Flash Flood Warnings in New Jersey, 2023 Flash Flood Warnings in Pennsylvania, 2023 Flash Flood Warnings in Delaware, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.