Alert archive / New Jersey / Areal Flood Advisories in 2021

Areal Flood Advisory 73, NWS Philadelphia/Mount Holly

July 12, 2021Burlington County, New Jersey

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 12, 2021, 5:41 PM EDT for Burlington County, New Jersey. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 12, 2021, 5:41 PM EDT (21:41 UTC)
Expired: Jul 12, 2021, 7:04 PM EDT
In force: 83 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Burlington County, NJ

The radar

The Philadelphia radar (KDIX), 23 km from the middle of the area, began a volume at 21:43 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, 9.7 hours before the alert went out and 180 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: 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.

725 
WGUS81 KPHI 122141
FLSPHI

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

NJC005-130100-
/O.NEW.KPHI.FA.Y.0073.210712T2141Z-210713T0100Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
541 PM EDT Mon Jul 12 2021

The National Weather Service in Mount Holly has issued a

* Flood Advisory for...
  Northern Burlington County in southern New Jersey...

* Until 900 PM EDT.

* At 541 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 1 to 2 inches 
  possible.

* Some locations that may experience flooding include...
  Medford, Lumberton, Mount Holly, Pemberton, Wrightstown, Jobstown, 
  Jacksonville, Columbus, Leisuretowne, Georgetown, Browns Mills, 
  and Medford Lakes.

This includes the following highways...
	New Jersey Turnpike near exit 5.
	Interstate 295 in New Jersey between mile markers 40 and 52.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3997 7449 3984 7483 3999 7496 4014 7462
      4013 7459

$$

Iovino

1 follow-up statement

260 
WGUS81 KPHI 122304
FLSPHI

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

NJC005-122314-
/O.CAN.KPHI.FA.Y.0073.000000T0000Z-210713T0100Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
704 PM EDT Mon Jul 12 2021

...FLOOD ADVISORY IS CANCELLED FOR NORTHERN BURLINGTON COUNTY...

The heavy rain has ended. Please continue to heed remaining road 
closures.

The Flash Flood Emergency remains in effect until 9:00 PM for the 
communities along the Delaware River and the US 130 Corridor in 
Burlington County.

LAT...LON 3997 7449 3984 7483 3999 7496 4014 7462
      4013 7459

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 1:59 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	3 hr
Jul 12, 2:12 PM EDT	Flash Flood Warning Emergency	PHI	Burlington	7 hr
Jul 12, 2:20 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth	3 hr
Jul 12, 2:37 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth	93 min
Jul 12, 3:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	67 min
Jul 12, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	41 min
Jul 12, 4:26 PM EDT	Special Marine Warning	PHI		2 hr
Jul 12, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	42 min
Jul 12, 4:52 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	98 min
Jul 12, 5:08 PM EDT	Areal Flood Advisory	PHI	Sussex	5 hr
Jul 12, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Mercer	67 min
Jul 12, 5:26 PM EDT	Areal Flood Advisory	PHI	Camden	2 hr
Jul 12, 5:36 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Jul 12, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	63 min
Jul 12, 6:01 PM EDT	Flash Flood Warning	PHI	Camden	102 min
Jul 12, 6:08 PM EDT	Areal Flood Advisory	PHI	Morris	98 min
Jul 12, 6:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	93 min
Jul 12, 6:52 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	34 min
Jul 12, 7:00 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	112 min
Jul 12, 7:06 PM EDT	Severe Thunderstorm Warning	PHI	Salem	69 min
Jul 12, 7:11 PM EDT	Flash Flood Warning	PHI	Morris, Sussex	35 min
Jul 12, 7:33 PM EDT	Special Marine Warning	PHI		58 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.