Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 22, NWS Philadelphia/Mount Holly

August 22, 2021Middlesex County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 22, 2021, 11:27 PM EDT for Middlesex County, New Jersey. It was in force for 29 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
Aug 22, 2021, 11:27 PM EDT (03:27 UTC)
Expired
Aug 24, 2021, 4:00 AM EDT
In force
29 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

County Middlesex County, NJ

The radar

The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 03:30 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

TimeReportWhereRemark
Aug 23, 6:00 AM EDTHEAVY RAIN 7.01Helmetta, NJCOCORAHS STATION NJ-MD-94 HELMETTA 0.1 NE.
Aug 23, 9:30 AM EDTHEAVY RAIN 8.661 Ese Jamesburg, NJMESONET STATION FW3165 JAMESBURG.

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 00:00Z, 3.5 hours before the alert went out and 142 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-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 59 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
59 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
610 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
-66 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

546 
WGUS41 KPHI 230327
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1127 PM EDT Sun Aug 22 2021

NJC023-231300-
/O.NEW.KPHI.FA.W.0022.210823T0327Z-210823T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
1127 PM EDT Sun Aug 22 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  South Central Middlesex County in northern New Jersey...

* Until 900 AM EDT Monday.

* At 1127 PM EDT, river gauge reports indicated that minor flooding 
  was continuing along Manalapan Brook. The brook should return 
  within its banks on Monday.

* Some locations that are experiencing flooding include...
  Jamesburg, Helmetta, and Spotswood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

Iovino
5 follow-up statements
074 
WGUS41 KPHI 230900
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
500 AM EDT Mon Aug 23 2021

NJC023-240400-
/O.EXT.KPHI.FA.W.0022.000000T0000Z-210824T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
500 AM EDT Mon Aug 23 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  South Central Middlesex County in northern New Jersey...

* Until midnight EDT Tuesday.

* At 500 AM EDT, river gauge reports indicated that minor flooding 
  was continuing along Manalapan Brook. The brook should return 
  within its banks tonight.

* Some locations that will experience flooding include...
  Jamesburg, Helmetta, and Spotswood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

Iovino
235 
WGUS81 KPHI 231610
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
1210 PM EDT Mon Aug 23 2021

NJC023-240400-
/O.CON.KPHI.FA.W.0022.000000T0000Z-210824T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
1210 PM EDT Mon Aug 23 2021

...FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT FOR 
SOUTH CENTRAL MIDDLESEX COUNTY...

At 1210 PM EDT, river gauge reports indicated that minor flooding 
was continuing along Manalapan Brook. The brook should return within 
its banks tonight.

Some locations that will experience flooding include...
  East Brunswick, Jamesburg, Whittingham, Spotswood, Helmetta, and 
  Concordia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

Kruzdlo
866 
WGUS41 KPHI 240350
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
1150 PM EDT Mon Aug 23 2021

NJC023-240600-
/O.EXT.KPHI.FA.W.0022.000000T0000Z-210824T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
1150 PM EDT Mon Aug 23 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  South Central Middlesex County in northern New Jersey...

* Until 200 AM EDT.

* At 1150 PM EDT, Minor flooding will continue over the next few 
  hours, particularly near small streams.

* Some locations that may experience flooding include...
  East Brunswick, Jamesburg, Whittingham, Spotswood, Helmetta, and 
  Concordia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

NC
873 
WGUS41 KPHI 240550
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
150 AM EDT Tue Aug 24 2021

NJC023-240800-
/O.EXT.KPHI.FA.W.0022.000000T0000Z-210824T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
150 AM EDT Tue Aug 24 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  South Central Middlesex County in northern New Jersey...

* Until 400 AM EDT.

* At 150 AM EDT, Minor flooding will continue over the next few 
  hours, particularly near small streams.

* Some locations that may experience flooding include...
  East Brunswick, Jamesburg, Whittingham, Spotswood, Helmetta, and 
  Concordia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

NC
170 
WGUS81 KPHI 240752
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
352 AM EDT Tue Aug 24 2021

NJC023-240802-
/O.EXP.KPHI.FA.W.0022.000000T0000Z-210824T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Middlesex NJ-
352 AM EDT Tue Aug 24 2021

...FLOOD WARNING WILL EXPIRE AT 4 AM EDT EARLY THIS MORNING FOR 
SOUTH CENTRAL MIDDLESEX COUNTY...

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

LAT...LON 4037 7438 4036 7441 4034 7441 4032 7445
      4036 7447 4039 7445 4042 7439

$$

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 8:11 PM EDTAreal Flood AdvisoryPHIWarren6 hr
Aug 22, 8:47 PM EDTFlash Flood WarningPHISussex, Warren6 hr
Aug 23, 2:09 AM EDTRiver Flood WarningPHIMorris, Passaic17 hr
Aug 23, 3:25 AM EDTAreal Flood WarningPHIMorris8 hr
Aug 23, 4:10 AM EDTRiver Flood WarningPHIMorris41 hr
Aug 23, 5:07 AM EDTAreal Flood WarningPHIWarren21 hr
Aug 23, 5:22 AM EDTAreal Flood WarningPHISomerset9 hr
Aug 23, 5:44 AM EDTAreal Flood WarningPHIHunterdon7 hr
Aug 23, 7:20 AM EDTRiver Flood WarningPHIHunterdon, Somerset7 hr
Aug 23, 7:47 AM EDTRiver Flood WarningPHIMorris, Passaic13 hr
Aug 23, 8:36 AM EDTAreal Flood WarningPHISomerset9 hr
Aug 23, 8:42 AM EDTRiver Flood WarningPHIMiddlesex, Somerset21 hr
Aug 23, 11:22 AM EDTRiver Flood WarningPHIMiddlesex, Somerset16 hr
Aug 23, 11:32 AM EDTRiver Flood WarningPHIEssex, Morris, Passaic5 days
Aug 23, 11:58 AM EDTRiver Flood WarningPHISomerset15 hr
Aug 23, 12:19 PM EDTRiver Flood WarningPHIBurlington33 hr
Aug 23, 12:51 PM EDTCoastal Flood StatementPHIOcean3 hr
Aug 23, 2:26 PM EDTAreal Flood WarningPHISussex14 hr
Aug 23, 2:26 PM EDTSpecial Weather StatementPHIOcean49 min
Aug 23, 3:12 PM EDTSpecial Weather StatementPHIOcean33 min
Aug 23, 3:15 PM EDTSevere Thunderstorm WarningPHIOcean45 min
Aug 23, 3:18 PM EDTSpecial Marine WarningPHI57 min
Aug 23, 3:38 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic48 hr
Aug 23, 4:47 PM EDTSpecial Weather StatementPHIAtlantic28 min
Aug 23, 4:50 PM EDTSpecial Marine WarningPHI55 min
Aug 23, 5:13 PM EDTSpecial Weather StatementPHICamden32 min
Aug 23, 5:39 PM EDTSpecial Marine WarningPHI33 min
Aug 23, 6:46 PM EDTSpecial Marine WarningPHI64 min

Nearby

Areal Flood Warnings in New Jersey, 2021Every 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.