Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 39, NWS Philadelphia/Mount Holly

July 9, 2023Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 9, 2023, 2:05 PM EDT for Sussex County, New Jersey. It was in force for 6 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 9, 2023, 2:05 PM EDT (18:05 UTC)
Expired: Jul 9, 2023, 8:00 PM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 18:07 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

Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 166 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: 216 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

732 
WGUS51 KPHI 091805
FFWPHI
NJC037-100000-
/O.NEW.KPHI.FF.W.0039.230709T1805Z-230710T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
205 PM EDT Sun Jul 9 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northern Sussex County in northwestern New Jersey...

* Until 800 PM EDT.

* At 205 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. 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.

  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...
  Montague, Sussex, Branchville, Pellettown, Hainesville, High 
  Point, Crandon Lakes, and Flatbrookville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4125 7447 4120 7455 4113 7472 4108 7494
      4110 7497 4109 7499 4111 7498 4114 7492
      4116 7490 4122 7486 4123 7487 4128 7484
      4135 7475 4136 7469

FLASH FLOOD...RADAR INDICATED

$$

Hoeflich

1 follow-up statement

165 
WGUS71 KPHI 092350
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
750 PM EDT Sun Jul 9 2023

NJC037-100000-
/O.EXP.KPHI.FF.W.0039.000000T0000Z-230710T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex NJ-
750 PM EDT Sun Jul 9 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING FOR 
NORTHERN SUSSEX COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat.

A Flood Watch remains in effect until 600 AM EDT Monday for portions 
of central New Jersey...northern New Jersey...and northwest New 
Jersey.

LAT...LON 4125 7447 4120 7455 4113 7472 4108 7494
      4110 7497 4109 7499 4111 7498 4114 7492
      4116 7490 4122 7486 4123 7487 4128 7484
      4135 7475 4136 7469

$$

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 12:37 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	2 hr
Jul 9, 1:02 PM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	8 hr
Jul 9, 1:57 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	65 min
Jul 9, 2:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Warren	4 min
Jul 9, 2:34 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset, Warren	6 hr
Jul 9, 2:59 PM EDT	Special Weather Statement	PHI	Somerset	31 min
Jul 9, 3:00 PM EDT	Flash Flood Warning	PHI	Morris, Somerset, Sussex, Warren	6 hr
Jul 9, 4:12 PM EDT	Special Weather Statement	PHI	Somerset	33 min
Jul 9, 4:34 PM EDT	Special Marine Warning	PHI		86 min
Jul 9, 4:57 PM EDT	Special Marine Warning	PHI		93 min
Jul 9, 4:58 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	47 min
Jul 9, 5:09 PM EDT	Flash Flood Warning	PHI	Salem	4 hr
Jul 9, 5:10 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	50 min
Jul 9, 5:15 PM EDT	Special Weather Statement	PHI	Hunterdon, Warren	30 min
Jul 9, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	25 min
Jul 9, 5:49 PM EDT	Special Weather Statement	PHI	Cumberland	26 min
Jul 9, 5:59 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer	4 hr
Jul 9, 5:59 PM EDT	Special Weather Statement	PHI	Cape May	46 min
Jul 9, 6:33 PM EDT	Special Marine Warning	PHI		87 min
Jul 9, 6:52 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	4 hr
Jul 9, 7:11 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Salem	3 hr
Jul 9, 7:16 PM EDT	Special Weather Statement	PHI	Burlington	29 min
Jul 9, 7:21 PM EDT	Special Marine Warning	PHI		114 min
Jul 9, 7:29 PM EDT	River Flood Warning	PHI	Hunterdon, Somerset	10 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.