Alert archive / New Jersey / Areal Flood Advisories in 2021

Areal Flood Advisory 63, NWS Philadelphia/Mount Holly

July 9, 20214 counties in New Jersey; Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 9, 2021, 7:39 PM EDT for 4 counties in New Jersey; Monroe County, Northampton County, Pennsylvania. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 9, 2021, 7:39 PM EDT (23:39 UTC)
Expired: Jul 9, 2021, 9:59 PM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Morris County, NJ, Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 23:38 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

Albany, NY (KALY), launched 12:00Z, 11.7 hours before the alert went out and 238 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: 3 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 764 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

509 
WGUS81 KPHI 092339
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
739 PM EDT Fri Jul 9 2021

NJC019-027-037-041-PAC089-095-100245-
/O.NEW.KPHI.FA.Y.0063.210709T2339Z-210710T0245Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
739 PM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly has issued a

* Flood Advisory for...
  Southwestern Morris County in northern New Jersey...
  Northeastern Hunterdon County in northwestern New Jersey...
  Southwestern Sussex County in northwestern New Jersey...
  Warren County in northwestern New Jersey...
  Northampton County in eastern Pennsylvania...
  Southern Monroe County in northeastern Pennsylvania...

* Until 1045 PM EDT.

* At 739 PM EDT, Doppler radar indicated heavy rain due to 
  thunderstorms. Minor flooding is ongoing or expected to begin 
  shortly across portions of the advised area. Between 1 and 2 
  inches of rain have already fallen in spots and additional 
  rainfall is expected.

* Some locations that will experience flooding include...
  Easton, East Stroudsburg, Hackettstown, Washington, Blairstown, 
  Nazareth, Bangor, Pen Argyl, Wind Gap, Bath, Belvidere, and 
  Harmony.

This includes the following highways...
	Interstate 80 in New Jersey between mile markers 0 and 23.
	Interstate 80 in Pennsylvania between mile markers 294 and 314.
	Interstate 380 in Pennsylvania near mile marker 0.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 4081 7551 4081 7547 4086 7550 4109 7547
      4103 7476 4070 7476 4071 7552

$$

Kruzdlo

1 follow-up statement

288 
WGUS81 KPHI 100159
FLSPHI

Flood Advisory
National Weather Service Mount Holly NJ
959 PM EDT Fri Jul 9 2021

NJC019-027-037-041-PAC089-095-100209-
/O.CAN.KPHI.FA.Y.0063.000000T0000Z-210710T0245Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Morris NJ-Sussex NJ-Warren NJ-Monroe PA-Northampton PA-
959 PM EDT Fri Jul 9 2021

...FLOOD ADVISORY IS CANCELLED FOR SOUTHWESTERN MORRIS, NORTHEASTERN 
HUNTERDON, SOUTHWESTERN SUSSEX, WARREN, NORTHAMPTON, AND SOUTHERN 
MONROE COUNTIES...

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

LAT...LON 4081 7551 4081 7547 4086 7550 4109 7547
      4103 7476 4070 7476 4071 7552

$$

Deal

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, 12:08 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Gloucester	6 hr
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, 7:43 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
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	43 min
Jul 9, 6:55 PM EDT	Special Weather Statement	PHI	Carbon	35 min
Jul 9, 7:07 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jul 9, 7:31 PM EDT	Special Weather Statement	PHI	Northampton	29 min

Nearby

Areal Flood Advisories in New Jersey, 2021 Areal Flood Advisories in Pennsylvania, 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.