Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 52, NWS Philadelphia/Mount Holly

July 14, 2023Northampton County, Pennsylvania; Morris County, Sussex County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2023, 7:40 PM EDT for Northampton County, Pennsylvania; Morris County, Sussex County, Warren County, New Jersey. It was in force for 6 hr. 8 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: Jul 14, 2023, 7:40 PM EDT (23:40 UTC)
Expired: Jul 15, 2023, 1:45 AM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 23:41 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
Jul 14, 8:07 PM EDT	FLOOD	1 Se Liberty Twp, NJ	Flooding on US 46 eastbound West of CR 611/Hope Rd (Liberty Twp). 1 Right lane of 2 lanes closed.
Jul 14, 8:29 PM EDT	FLOOD	Newton, NJ	Flooding on NJ 94 both directions Church St (Newton) to CR 519/West End Av (Newton). All lanes closed.
Jul 14, 9:00 PM EDT	FLOOD	Hackettstown, NJ	Basement flooding report in the Hackettstown area.
Jul 14, 9:03 PM EDT	RAIN 2.2	Fredon Twp, NJ
Jul 14, 9:15 PM EDT	FLASH FLOOD	1 Ese Washington Twp, PA	Multiple flooded roads in the Bangor and Washinton Township area. Some cars stalled in flooded roadways. Time estimated from radar.
Jul 14, 9:30 PM EDT	FLASH FLOOD	Lower Mount Bethel Twp, PA	Multiple water assists on South Delaware Drive. Time estimated from radar.
Jul 14, 11:00 PM EDT	FLASH FLOOD	1 Ssw Harmony, NJ	Report of road flooding in Harmony Township. Time estimated.
Jul 14, 11:00 PM EDT	FLASH FLOOD	2 Ne Montana, NJ	Observer reports multiple roads flooded in the area. Time estimated.

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, 11.7 hours before the alert went out and 182 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: 210 J/kg
Mixed-layer CIN: -225 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

731 
WGUS51 KPHI 142340
FFWPHI
NJC027-037-041-PAC095-150345-
/O.NEW.KPHI.FF.W.0052.230714T2340Z-230715T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
740 PM EDT Fri Jul 14 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  West Central Morris County in northern New Jersey...
  Southwestern Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 1145 PM EDT.

* At 740 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 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...
  Easton, Newton, Hopatcong, Hackettstown, Washington, Blairstown, 
  Bangor, Mount Arlington, Stanhope, Pen Argyl, Netcong, and Wind 
  Gap.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 1 and 27.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles. In hilly terrain there are hundreds 
of low water crossings which are potentially dangerous in heavy 
rain. Do not attempt to cross flooded roads. Find an alternate route.

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4096 7513 4097 7512 4097 7513
      4099 7513 4104 7503 4107 7501 4109 7497
      4110 7497 4109 7499 4110 7499 4112 7495
      4113 7472 4105 7459 4092 7465 4080 7485

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

$$

Staarmann

5 follow-up statements

593 
WGUS71 KPHI 150046
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
846 PM EDT Fri Jul 14 2023

NJC027-037-041-PAC095-150345-
/O.CON.KPHI.FF.W.0052.000000T0000Z-230715T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Sussex NJ-Warren NJ-Northampton PA-
846 PM EDT Fri Jul 14 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT THIS 
EVENING FOR WEST CENTRAL MORRIS, SOUTHWESTERN SUSSEX, WARREN, AND 
NORTHEASTERN NORTHAMPTON COUNTIES...

At 846 PM EDT, department of highways reported thunderstorms 
producing heavy rain across the warned area. Between 1.5 and 3.5 
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 already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Department of Highways 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...
  Easton, Newton, Hopatcong, Hackettstown, Washington, Blairstown, 
  Bangor, Mount Arlington, Stanhope, Pen Argyl, Netcong, and Wind 
  Gap.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 1 and 27.

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.

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4096 7513 4097 7512 4097 7513
      4099 7513 4104 7503 4107 7501 4109 7497
      4110 7497 4109 7499 4110 7499 4112 7495
      4113 7472 4105 7459 4092 7465 4080 7485

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Staarmann

945 
WGUS71 KPHI 150226
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1026 PM EDT Fri Jul 14 2023

NJC027-037-041-PAC095-150345-
/O.CON.KPHI.FF.W.0052.000000T0000Z-230715T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Sussex NJ-Warren NJ-Northampton PA-
1026 PM EDT Fri Jul 14 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT THIS 
EVENING FOR WEST CENTRAL MORRIS, SOUTHWESTERN SUSSEX, WARREN, AND 
NORTHEASTERN NORTHAMPTON COUNTIES...

At 1026 PM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 2 and 4.5 
inches of rain have fallen. The expected rainfall rate is 0.5 to 1 
inch in 1 hour. Additional rainfall amounts up to 0.5 inches are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

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...
  Easton, Newton, Hopatcong, Hackettstown, Washington, Blairstown, 
  Bangor, Mount Arlington, Stanhope, Pen Argyl, Netcong, and Wind 
  Gap.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 1 and 27.

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.

Flooding is occurring or is imminent. It is important to know where 
you are relative to streams, rivers, or creeks which can become 
killers in heavy rains. Campers and hikers should avoid streams or 
creeks.

&&

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4096 7513 4097 7512 4099 7513
      4104 7503 4107 7501 4109 7497 4110 7497
      4109 7499 4110 7499 4112 7495 4113 7472
      4105 7459 4092 7465 4080 7485

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

$$

Staarmann

944 
WGUS71 KPHI 150324
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1124 PM EDT Fri Jul 14 2023

NJC037-150334-
/O.CAN.KPHI.FF.W.0052.000000T0000Z-230715T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex NJ-
1124 PM EDT Fri Jul 14 2023

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN SUSSEX COUNTY...

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

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4095 7515 4097 7512 4087 7475
      4080 7485

$$

NJC027-041-PAC095-150345-
/O.CON.KPHI.FF.W.0052.000000T0000Z-230715T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Warren NJ-Northampton PA-
1124 PM EDT Fri Jul 14 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT THIS 
EVENING FOR WEST CENTRAL MORRIS, CENTRAL WARREN, AND NORTHEASTERN 
NORTHAMPTON COUNTIES...

At 1124 PM EDT, local law enforcement reported flash flooding in 
Lower Mont Bethel Township and Washington Township in Northampton 
County. Between 2 and 4.5 inches of rain have fallen. Although the 
heaviest rain has left the warned area, additional light rainfall 
amounts up to 0.5 inches are possible in the warned area. 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...
  Easton, Hackettstown, Washington, Bangor, Pen Argyl, Wind Gap, 
  Belvidere, Harmony, Oxford, Hope, Belfast, and East Bangor.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 2 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4095 7515 4097 7512 4087 7475
      4080 7485

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5 INCHES IN 1 HOUR

$$

SFJ

674 
WGUS51 KPHI 150329
FFWPHI
NJC027-041-PAC095-150545-
/O.EXT.KPHI.FF.W.0052.000000T0000Z-230715T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1129 PM EDT Fri Jul 14 2023

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  West Central Morris County in northern New Jersey...
  Central Warren County in northwestern New Jersey...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 145 AM EDT.

* At 1129 PM EDT, local law enforcement reported flash flooding in 
  Lower Mont Bethel Township and Washington Township in Northampton 
  County. Between 2 and 4.5 inches of rain have fallen. The expected 
  rainfall rate is 0.5 inches in 1 hour. Although the heaviest rain 
  has left the warned area, additional light rainfall amounts up to 
  0.5 inches are possible. Additionally, it will take time for 
  runoff to recede. 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...
  Easton, Hackettstown, Washington, Bangor, Pen Argyl, Wind Gap, 
  Belvidere, Harmony, Oxford, Hope, Belfast, and East Bangor.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 2 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4095 7515 4097 7512 4087 7475
      4080 7485

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL RATE...0.5 INCHES IN 1 HOUR

$$

SFJ

954 
WGUS71 KPHI 150537
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
137 AM EDT Sat Jul 15 2023

NJC027-041-PAC095-150547-
/O.EXP.KPHI.FF.W.0052.000000T0000Z-230715T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Warren NJ-Northampton PA-
137 AM EDT Sat Jul 15 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 145 AM EDT EARLY THIS MORNING 
FOR WEST CENTRAL MORRIS, CENTRAL WARREN, AND NORTHEASTERN 
NORTHAMPTON COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. However, it may take time for some of the flood waters to 
recede. Please continue to heed any road closures.

LAT...LON 4068 7521 4085 7531 4090 7523 4091 7524
      4093 7521 4095 7515 4097 7512 4087 7475
      4080 7485

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:13 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 13, 8:20 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	25 min
Jul 13, 9:28 PM EDT	Special Weather Statement	PHI	Monroe	32 min
Jul 13, 10:01 PM EDT	Special Weather Statement	PHI	Monroe	44 min
Jul 13, 10:48 PM EDT	Special Weather Statement	PHI	Monroe	27 min
Jul 14, 5:30 AM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Jul 14, 5:54 AM EDT	Severe Thunderstorm Warning	PHI	Bucks	51 min
Jul 14, 3:43 PM EDT	Special Weather Statement	PHI	Montgomery	32 min
Jul 14, 4:40 PM EDT	Special Weather Statement	PHI	Carbon	35 min
Jul 14, 5:10 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	50 min
Jul 14, 5:33 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	29 min
Jul 14, 5:35 PM EDT	Special Weather Statement	PHI	Monroe	25 min
Jul 14, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	51 min
Jul 14, 6:02 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	6 hr
Jul 14, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	38 min
Jul 14, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	49 min
Jul 14, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	53 min
Jul 14, 7:08 PM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	39 min
Jul 14, 7:16 PM EDT	Special Weather Statement	PHI	Lehigh	29 min
Jul 13, 8:39 PM EDT	Coastal Flood Advisory	PHI	Ocean	5 hr
Jul 13, 8:53 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	67 min
Jul 13, 9:57 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	48 min
Jul 13, 10:49 PM EDT	Special Weather Statement	PHI	Sussex	26 min
Jul 14, 1:09 AM EDT	Special Weather Statement	PHI	Sussex	21 min
Jul 14, 1:52 AM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jul 14, 6:02 AM EDT	Special Weather Statement	PHI	Mercer	28 min
Jul 14, 6:20 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Morris, Somerset	40 min
Jul 14, 6:33 AM EDT	Special Weather Statement	PHI	Warren	27 min
Jul 14, 6:35 AM EDT	Special Weather Statement	PHI	Middlesex	25 min
Jul 14, 6:40 AM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	50 min
Jul 14, 6:55 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	50 min
Jul 14, 6:59 AM EDT	Special Weather Statement	PHI	Warren	31 min
Jul 14, 7:22 AM EDT	Special Weather Statement	PHI	Sussex	23 min
Jul 14, 7:27 AM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	18 min
Jul 14, 7:41 AM EDT	Special Weather Statement	PHI	Sussex	34 min
Jul 14, 4:21 PM EDT	Special Weather Statement	PHI	Somerset	39 min
Jul 14, 4:54 PM EDT	Special Weather Statement	PHI	Somerset	51 min
Jul 14, 6:06 PM EDT	Special Weather Statement	PHI	Morris	24 min
Jul 14, 6:07 PM EDT	Special Weather Statement	PHI	Warren	38 min
Jul 14, 6:20 PM EDT	Special Weather Statement	PHI	Sussex	25 min
Jul 14, 6:46 PM EDT	Special Weather Statement	PHI	Sussex	29 min
Jul 14, 7:03 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	41 min
Jul 14, 7:20 PM EDT	Special Weather Statement	PHI	Warren	25 min
Jul 14, 7:46 PM EDT	Areal Flood Advisory	PHI	Sussex	2 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.