Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 20, NWS Philadelphia/Mount Holly

August 22, 2021Middlesex County, Monmouth County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 22, 2021, 10:49 AM EDT for Middlesex County, Monmouth County, Somerset County, New Jersey. It was in force for 13 hr. 14 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: Aug 22, 2021, 10:49 AM EDT (14:49 UTC)
Expired: Aug 23, 2021, 12:00 AM EDT
In force: 13 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 14:50 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
Aug 22, 11:00 AM EDT	FLOOD	1 Nne Manalapan Twp, NJ	FLOODING ON ENGLISHTOWN ROAD FORCED ITS CLOSURE NEAR UNION HILL ROAD. TIME BASED ON DISPATCH REPORT.
Aug 22, 11:28 AM EDT	FLOOD	1 Sw Plainsboro Townshi, NJ	VIDEO OF FLOOD WATERS FLOWING ACROSS MAPLE AVENUE DOWNSTREAM OF PLAINSBORO POND.
Aug 22, 11:30 AM EDT	HEAVY RAIN 2.3	1 Ssw Belford, NJ	MESONET STATION FW2092 BELFORD.
Aug 22, 11:51 AM EDT	HEAVY RAIN 3.81	2 Ssw Browntown, NJ	MESONET STATION AV757 OLD BRIDGE.
Aug 22, 11:53 AM EDT	HEAVY RAIN 2.06	Strathmore, NJ	MESONET STATION AS690 ABERDEEN.
Aug 22, 11:55 AM EDT	HEAVY RAIN 3.7	2 Sw Kendall Park, NJ	MESONET STATION AV400 KENDALL PARK.
Aug 22, 11:56 AM EDT	HEAVY RAIN 2.1	1 E Keansburg, NJ	MESONET STATION CW1367 N.MIDDLETOWN.
Aug 22, 11:57 AM EDT	HEAVY RAIN 2.83	1 Ene Hazlet Twp, NJ	MESONET STATION FW7777 HAZLET.
Aug 22, 12:00 PM EDT	HEAVY RAIN 2.44	1 Nne Port Reading, NJ	MESONET STATION FW5744 CARTERET.
Aug 22, 12:00 PM EDT	HEAVY RAIN 2.8	1 Ssw Freehold, NJ	MESONET STATION FRHBP FREEHOLD.
Aug 22, 12:33 PM EDT	FLOOD	Englishtown, NJ	FLOODING ON MAIN STREET IN ENGLISHTOWN.
Aug 22, 12:45 PM EDT	FLOOD	1 Ssw Spotswood, NJ	THE GAUGE ON MANALAPAN BROOK AT SPOTSWOOD (SPTN4) REACHED MINOR FLOOD STAGE.
Aug 22, 1:00 PM EDT	HEAVY RAIN 5.2	Old Bridge, NJ	.
Aug 22, 1:00 PM EDT	HEAVY RAIN 5.2	Old Bridge, NJ

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, 2.8 hours before the alert went out and 134 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: 36 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

992 
WGUS41 KPHI 221449
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1049 AM EDT Sun Aug 22 2021

NJC023-025-035-221500-
/O.NEW.KPHI.FA.W.0020.210822T1449Z-210822T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Somerset NJ-
1049 AM EDT Sun Aug 22 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  Northern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Southeastern Somerset County in northern New Jersey...

* Until 1100 AM EDT.

* At 1049 AM EDT, local law enforcement reported flooding in much of 
  the warned area, with the worst flooding in central and southern 
  Middlesex County.  Several road closures remain, and rivers, 
  creeks, and streams remain in flood or elevated.  Between 3 and 9 
  inches of rain have fallen.

* For Lawrence Brook at Weston Mills:
  At 10:30am the stage was 18.4 feet.
  Flood Stage is 18 feet.
  ...
  For Swimming River at Red Bank:
  At 10:15am the stage was 6.08 feet.
  Flood Stage is 7 feet.

This includes the following highways...
	New Jersey Turnpike between exits 9 and 13.
	Interstate 287 in New Jersey between mile markers 0 and 10.
	Garden State Parkway between mile markers 102 and 133.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7459 4049 7446 4056 7453 4058 7451
      4060 7422 4056 7422 4050 7428 4047 7427
      4044 7421 4046 7414 4041 7402 4033 7401
      4022 7408 4024 7449 4024 7448 4027 7448
      4034 7463

$$

CMS

3 follow-up statements

198 
WGUS41 KPHI 221455
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1055 AM EDT Sun Aug 22 2021

NJC023-025-035-222100-
/O.EXT.KPHI.FA.W.0020.000000T0000Z-210822T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Somerset NJ-
1055 AM EDT Sun Aug 22 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  Northern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Southeastern Somerset County in northern New Jersey...

* Until 500 PM EDT Sunday.

* At 1055 AM EDT, local law enforcement reported flooding in much of 
  the warned area, with the worst flooding in central and southern 
  Middlesex County.  Several road closures remain, and rivers, 
  creeks, and streams remain in flood or elevated.  Between 3 and 9 
  inches of rain have fallen.

* For Lawrence Brook at Weston Mills:
  At 10:45am the stage was 18.4 feet.
  Flood Stage is 18 feet.
  ...
  For Swimming River at Red Bank:
  At 10:15am the stage was 6.08 feet.
  Flood Stage is 7 feet.

This includes the following highways...
	New Jersey Turnpike between exits 9 and 13.
	Interstate 287 in New Jersey between mile markers 0 and 10.
	Garden State Parkway between mile markers 102 and 133.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7459 4049 7446 4056 7453 4058 7451
      4060 7422 4056 7422 4050 7428 4047 7427
      4044 7421 4046 7414 4041 7402 4033 7401
      4022 7408 4024 7449 4024 7448 4027 7448
      4034 7463

$$

CMS

072 
WGUS81 KPHI 221634
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1234 PM EDT Sun Aug 22 2021

NJC023-025-035-222100-
/O.CON.KPHI.FA.W.0020.000000T0000Z-210822T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Somerset NJ-
1234 PM EDT Sun Aug 22 2021

...FLOOD WARNING REMAINS IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON FOR 
NORTHERN MONMOUTH, MIDDLESEX, AND SOUTHEASTERN SOMERSET COUNTIES...

At 1234 PM EDT, gauge reports indicated flooding was continuing on 
many creeks and streams in the warned area. Lawrence Brook at Weston 
Mills remained in flood, and Manalapan Brook at Spotswood was 
approaching flood stage at this time. In addition, law enforcement 
continues to report widespread street and lowland flooding with many 
road closures still in place. Do not drive through flooded roadways!

For Lawrence Brook at Weston Mills:
At 12:15pm the stage was 18.43 feet.
Flood Stage is 18 feet.

For Swimming River at Red Bank:
At 12:15pm the stage was 6.24 feet.
Flood Stage is 7 feet.

For Manalapan Brook at Spotswood:
At 12:15pm the stage was 18.86 feet.
Flood Stage is 19 feet.

This includes the following highways...
	New Jersey Turnpike between exits 9 and 13.
	Interstate 287 in New Jersey between mile markers 0 and 10.
	Garden State Parkway between mile markers 102 and 133.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7459 4049 7446 4056 7453 4058 7451
      4060 7422 4056 7422 4050 7428 4047 7427
      4044 7421 4046 7414 4041 7402 4033 7401
      4022 7408 4024 7449 4024 7448 4027 7448
      4034 7463

$$

CMS

618 
WGUS41 KPHI 221944
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
344 PM EDT Sun Aug 22 2021

NJC023-025-035-230400-
/O.EXT.KPHI.FA.W.0020.000000T0000Z-210823T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-Monmouth NJ-Somerset NJ-
344 PM EDT Sun Aug 22 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  Northern Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Southeastern Somerset County in northern New Jersey...

* Until midnight EDT Monday.

* At 344 PM EDT, gauge reports indicated flooding continuing in much 
  of Middlesex and Monmouth Counties, with Lawrence Brook and 
  Manalapan Brook in flood at this time. In addition, law 
  enforcement reports several road closures remain from the flash 
  flooding that occurred last night. Residual flooding is expected 
  to continue through the evening. Never drive through flooded 
  roadways!

* For Lawrence Brook at Weston Mills:
  At 3:30pm the stage was 18.1 feet.
  Flood Stage is 18 feet.
  ...
  For Swimming River at Red Bank:
  At 3:15pm the stage was 6.21 feet.
  Flood Stage is 7 feet.
  ...
  For Manalapan Brook at Spotswood:
  At 3:15pm the stage was 20.02 feet.
  Flood Stage is 19 feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4042 7459 4049 7446 4056 7453 4058 7451
      4060 7422 4056 7422 4050 7428 4047 7427
      4044 7421 4046 7414 4041 7402 4033 7401
      4022 7408 4024 7449 4024 7448 4027 7448
      4034 7463

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 9:35 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Ocean	3 hr
Aug 21, 10:47 PM EDT	Areal Flood Advisory	PHI	Morris	3 hr
Aug 21, 11:38 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Monmouth, Ocean	3 hr
Aug 22, 12:04 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Monmouth, Ocean	3 hr
Aug 22, 12:24 AM EDT	Flash Flood Warning	PHI	Morris	3 hr
Aug 22, 1:30 AM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	4 hr
Aug 22, 1:35 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	3 hr
Aug 22, 2:04 AM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth	9 hr
Aug 22, 2:09 AM EDT	Flash Flood Warning	PHI	Burlington, Ocean	5 hr
Aug 22, 2:40 AM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Somerset	5 hr
Aug 22, 3:10 AM EDT	Flash Flood Warning	PHI	Burlington, Hunterdon, Mercer, Monmouth, Ocean	8 hr
Aug 22, 4:21 AM EDT	Flash Flood Warning	PHI	Monmouth, Ocean	3 hr
Aug 22, 5:36 AM EDT	Flash Flood Warning Considerable damage threat	PHI	Mercer, Middlesex, Monmouth, Somerset	5 hr
Aug 22, 6:07 AM EDT	Flash Flood Warning	PHI	Hunterdon, Warren	67 min
Aug 22, 7:52 AM EDT	Areal Flood Warning	PHI	Hunterdon, Somerset	15 hr
Aug 22, 10:43 AM EDT	Special Marine Warning	PHI		62 min
Aug 22, 10:52 AM EDT	Areal Flood Warning	PHI	Hunterdon, Mercer, Monmouth	13 hr
Aug 22, 11:06 AM EDT	Special Marine Warning	PHI		54 min
Aug 22, 1:35 PM EDT	Coastal Flood Advisory	PHI	Cape May	10 hr
Aug 22, 1:53 PM EDT	Areal Flood Advisory	PHI	Morris	6 hr
Aug 22, 3:21 PM EDT	River Flood Warning	PHI	Somerset	54 hr
Aug 22, 5:07 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	6 hr
Aug 22, 5:48 PM EDT	Flash Flood Warning	PHI	Morris, Sussex, Warren	6 hr

Nearby

Areal Flood Warnings in New Jersey, 2021 Every areal flood warning in 2021

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.