Alert archive / New Jersey / Areal Flood Advisories in 2021

Areal Flood Advisory 56, NWS Philadelphia/Mount Holly

July 9, 2021Atlantic County, Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 9, 2021, 12:08 AM EDT for Atlantic County, Camden County, Gloucester County, New Jersey. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 12:08 AM EDT (04:08 UTC)
Expired: Jul 9, 2021, 6:13 AM EDT
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Atlantic County, NJ, Camden County, NJ, Gloucester County, NJ

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 04:12 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.1 hours before the alert went out and 189 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: 440 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

431 
WGUS81 KPHI 090408
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
1208 AM EDT Fri Jul 9 2021

NJC001-007-015-091300-
/O.NEW.KPHI.FA.Y.0056.210709T0408Z-210709T1300Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-Camden NJ-Gloucester NJ-
1208 AM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly has issued a

* Flood Advisory for...
  Atlantic County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...

* Until 900 AM EDT Friday.

* At 1208 AM EDT, Doppler radar indicated that areas of heavy rain 
  were continuing to move into the counties of Atlantic, Gloucester 
  and Camden. Minor flooding is ongoing or expected to begin shortly 
  in the advisory area. Between 0.5 and 1 inch of rain has fallen 
  with another 2 to 3 inches possible.

* Some locations that may experience flooding include...
  Camden, Atlantic City, Gloucester City, Cherry Hill, Deptford, 
  Voorhees, West Deptford, Pleasantville, and Glassboro.

This includes the following highways...
	New Jersey Turnpike between exits 2 and 3.
	Interstate 76 in New Jersey between mile markers 0 and 3.
	Interstate 295 in New Jersey between mile markers 9 and 35.
	Interstate 676 in New Jersey between mile markers 0 and 4.
	Garden State Parkway between mile markers 29 and 30...and
	between mile markers 32 and 48.
	Atlantic City Expressway between mile markers 0 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3978 7544 3988 7515 3996 7513 4000 7503
      3979 7490 3978 7481 3968 7467 3963 7465
      3951 7425 3939 7432 3926 7454 3927 7459
      3929 7455 3930 7456 3927 7460 3931 7483
      3933 7486 3943 7486

$$

Iovino

1 follow-up statement

863 
WGUS81 KPHI 091013
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
613 AM EDT Fri Jul 9 2021

NJC001-007-015-091023-
/O.CAN.KPHI.FA.Y.0056.000000T0000Z-210709T1300Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Atlantic NJ-Camden NJ-Gloucester NJ-
613 AM EDT Fri Jul 9 2021

...FLOOD ADVISORY IS CANCELLED FOR ATLANTIC, CAMDEN, AND GLOUCESTER 
COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3978 7544 3988 7515 3996 7513 4000 7503
      3979 7490 3978 7481 3968 7467 3963 7465
      3951 7425 3939 7432 3926 7454 3927 7459
      3929 7455 3930 7456 3927 7460 3931 7483
      3933 7486 3943 7486

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 10:25 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	7 hr
Jul 8, 11:02 PM EDT	Special Marine Warning	PHI		88 min
Jul 8, 11:59 PM EDT	Areal Flood Advisory	PHI	Salem	5 hr
Jul 9, 12:07 AM EDT	Special Marine Warning	PHI		53 min
Jul 9, 12:25 AM EDT	Special Marine Warning	PHI		95 min
Jul 9, 1:34 AM EDT	Special Marine Warning	PHI		86 min
Jul 9, 1:49 AM EDT	Special Marine Warning	PHI		26 min
Jul 9, 2:05 AM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	8 hr
Jul 9, 2:50 AM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	25 min
Jul 9, 2:53 AM EDT	Special Marine Warning	PHI		68 min
Jul 9, 3:38 AM EDT	Tornado Warning	PHI	Atlantic, Burlington, Ocean	18 min
Jul 9, 3:51 AM EDT	Special Marine Warning	PHI		84 min
Jul 9, 4:08 AM EDT	Gale Warning	PHI		3 hr
Jul 9, 4:41 AM EDT	Tornado Warning	PHI	Monmouth, Ocean	34 min
Jul 9, 4:44 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex	5 hr
Jul 9, 4:54 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	5 hr
Jul 9, 4:58 AM EDT	Special Marine Warning	PHI		39 min
Jul 9, 5:34 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	2 hr
Jul 9, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Salem	41 min
Jul 9, 6:24 PM EDT	Special Marine Warning	PHI		66 min
Jul 9, 6:50 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	2 hr
Jul 9, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	63 min
Jul 9, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	23 min
Jul 9, 7:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	2 hr
Jul 9, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	62 min
Jul 9, 7:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	108 min

Nearby

Areal Flood Advisories in New Jersey, 2021 Every 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.