Alert archive / New Jersey / Flash Flood Warnings in 2023

Flash Flood Warning 70, NWS Philadelphia/Mount Holly

July 18, 2023Monmouth County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 18, 2023, 1:22 PM EDT for Monmouth County, New Jersey. It was in force for 2 hr. 2 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 18, 2023, 1:22 PM EDT (17:22 UTC)
Expired: Jul 18, 2023, 3:23 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Monmouth County, NJ

The radar

The Philadelphia radar (KDIX), 61 km from the middle of the area, began a volume at 17:21 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 18, 1:50 PM EDT	FLASH FLOOD	1 Nw Navesink, NJ	Hillside Avenue was closed at Brook Avenue in Middletown Township.
Jul 18, 1:50 PM EDT	FLASH FLOOD	Atlantic Highlands, NJ	Roadway flooding with some road closures.

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, 5.4 hours before the alert went out and 110 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: 403 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 790 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

436 
WGUS51 KPHI 181722
FFWPHI
NJC025-182130-
/O.NEW.KPHI.FF.W.0070.230718T1722Z-230718T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
122 PM EDT Tue Jul 18 2023

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Northeastern Monmouth County in central New Jersey...

* Until 530 PM EDT.

* At 122 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 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...
  Long Branch, Sandy Hook, Middletown, Tinton Falls, Holmdel, Red 
  Bank, Lincroft, Navesink, Elberon, East Freehold, Eatontown, and 
  West Long Branch.

This includes the following highways...
	Garden State Parkway between mile markers 105 and 115.

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.

&&

LAT...LON 4028 7424 4045 7412 4042 7406 4040 7398
      4041 7398 4042 7398 4042 7399 4043 7399
      4045 7399 4045 7400 4047 7402 4048 7402
      4048 7401 4044 7398 4042 7395 4040 7394
      4024 7398

FLASH FLOOD...RADAR INDICATED

$$

Iovino

1 follow-up statement

969 
WGUS71 KPHI 181923
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
323 PM EDT Tue Jul 18 2023

NJC025-181933-
/O.CAN.KPHI.FF.W.0070.000000T0000Z-230718T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monmouth NJ-
323 PM EDT Tue Jul 18 2023

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN MONMOUTH 
COUNTY...

Flood waters have receded. However, a Flood Advisory remains in 
effect for the potential of additional locally heavy rain with 
scattered showers and thunderstorms.

LAT...LON 4028 7424 4045 7412 4042 7406 4040 7398
      4041 7398 4042 7398 4042 7399 4043 7399
      4045 7399 4045 7400 4047 7402 4048 7402
      4048 7401 4044 7398 4042 7395 4040 7394
      4024 7398

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 11:19 AM EDT	Special Weather Statement	PHI	Middlesex	26 min
Jul 18, 11:34 AM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	117 min
Jul 18, 1:06 PM EDT	Areal Flood Advisory	PHI	Monmouth	4 hr
Jul 18, 1:28 PM EDT	Special Weather Statement	PHI	Ocean	47 min
Jul 18, 1:29 PM EDT	Special Marine Warning	PHI		27 min
Jul 18, 2:29 PM EDT	Special Weather Statement	PHI	Cape May	46 min
Jul 18, 2:30 PM EDT	Special Marine Warning	PHI		45 min
Jul 18, 2:46 PM EDT	Special Weather Statement	PHI	Atlantic	44 min
Jul 18, 3:06 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth	89 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.