Alert archive / New Jersey / Areal Flood Advisories in 2021

Areal Flood Advisory 70, NWS Philadelphia/Mount Holly

July 12, 2021Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 12, 2021, 4:52 PM EDT for Monmouth County, Ocean County, New Jersey. It was in force for 98 min.

The area

The outline as issued.

The facts

Issued
Jul 12, 2021, 4:52 PM EDT (20:52 UTC)
Expired
Jul 12, 2021, 6:30 PM EDT
In force
98 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 25 km from the middle of the area, began a volume at 20:55 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, 8.9 hours before the alert went out and 145 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 12:00Z on 2021-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 857 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
857 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
697 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.4

Open this sounding in Storm Lab

The text

As transmitted.

944 
WGUS81 KPHI 122052
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
452 PM EDT Mon Jul 12 2021

NJC025-029-122230-
/O.NEW.KPHI.FA.Y.0070.210712T2052Z-210712T2230Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monmouth NJ-Ocean NJ-
452 PM EDT Mon Jul 12 2021

The National Weather Service in Mount Holly has issued a

* Flood Advisory for...
  Southeastern Monmouth County in central New Jersey...
  Northeastern Ocean County in southern New Jersey...

* Until 630 PM EDT.

* At 452 PM EDT, Doppler radar indicated heavy rain due to 
  thunderstorms. Minor flooding is ongoing or expected to begin 
  shortly in the advisory area. Between 0.5 and 1.5 inches of rain 
  have already fallen in spots with an additional inch possible.

* Some locations that may experience flooding include...
  Toms River, Lakewood, Beachwood, Manasquan, Point Pleasant Beach, 
  Seaside Heights, Mantoloking, Leisure Village East, Brick 
  Township, Leisure Village, Dover Beaches North, and Dover Beaches 
  South.

This includes the following highways...
	Garden State Parkway between mile markers 77 and 97.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7424 4014 7422 4018 7401 4018 7400
      4005 7403 3997 7406 3986 7408 3987 7414
      3987 7415 3987 7416

$$

Iovino
1 follow-up statement
674 
WGUS81 KPHI 122145
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
545 PM EDT Mon Jul 12 2021

NJC025-122155-
/O.CAN.KPHI.FA.Y.0070.000000T0000Z-210712T2230Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monmouth NJ-
545 PM EDT Mon Jul 12 2021

...FLOOD ADVISORY IS CANCELLED FOR SOUTHEASTERN MONMOUTH COUNTY...

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

LAT...LON 3988 7424 4001 7423 4005 7405 4005 7403
      3997 7406 3986 7408 3987 7414 3987 7416

$$

NJC029-122230-
/O.CON.KPHI.FA.Y.0070.000000T0000Z-210712T2230Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ocean NJ-
545 PM EDT Mon Jul 12 2021

...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 630 PM EDT THIS EVENING 
FOR NORTHEASTERN OCEAN COUNTY...

At 545 PM EDT, Doppler radar indicated heavy rain due to 
thunderstorms. Minor flooding is ongoing or expected to begin 
shortly in the advisory area. Between 1 and 3 inches of rain have 
already fallen in spots with an additional inch possible.

Some locations that may experience flooding include...
  Toms River, Beachwood, Seaside Heights, Mantoloking, Dover Beaches 
  South, Dover Beaches North, Leisure Village East, Pleasant Plains, 
  Holiday City South, South Toms River, Island Heights, and Gilford 
  Park.

This includes the following highways...
	Garden State Parkway between mile markers 77 and 86.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7424 4001 7423 4005 7405 4005 7403
      3997 7406 3986 7408 3987 7414 3987 7416

$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 1:59 PM EDTAreal Flood AdvisoryPHIBurlington, Camden3 hr
Jul 12, 2:12 PM EDTFlash Flood Warning EmergencyPHIBurlington7 hr
Jul 12, 2:20 PM EDTAreal Flood AdvisoryPHIMercer, Middlesex, Monmouth3 hr
Jul 12, 2:37 PM EDTFlash Flood WarningPHIMercer, Middlesex, Monmouth93 min
Jul 12, 3:08 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean67 min
Jul 12, 3:31 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth41 min
Jul 12, 4:26 PM EDTSpecial Marine WarningPHI2 hr
Jul 12, 4:33 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean42 min
Jul 12, 5:08 PM EDTAreal Flood AdvisoryPHISussex5 hr
Jul 12, 5:08 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Mercer67 min
Jul 12, 5:26 PM EDTAreal Flood AdvisoryPHICamden2 hr
Jul 12, 5:36 PM EDTSpecial Weather StatementPHISussex24 min
Jul 12, 5:41 PM EDTAreal Flood AdvisoryPHIBurlington83 min
Jul 12, 5:57 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex63 min
Jul 12, 6:01 PM EDTFlash Flood WarningPHICamden102 min
Jul 12, 6:08 PM EDTAreal Flood AdvisoryPHIMorris98 min
Jul 12, 6:43 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester93 min
Jul 12, 6:52 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex34 min
Jul 12, 7:00 PM EDTAreal Flood AdvisoryPHIGloucester, Salem112 min
Jul 12, 7:06 PM EDTSevere Thunderstorm WarningPHISalem69 min
Jul 12, 7:11 PM EDTFlash Flood WarningPHIMorris, Sussex35 min
Jul 12, 7:33 PM EDTSpecial Marine WarningPHI58 min

Nearby

Areal Flood Advisories in New Jersey, 2021Every areal flood advisory 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.