Alert archive / New Jersey / Special Weather Statements in 2018

Special Weather Statement, NWS Philadelphia/Mount Holly

August 3, 2018Camden County, Gloucester County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 3, 2018, 12:37 PM EDT for Camden County, Gloucester County, New Jersey; Philadelphia County, Pennsylvania. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 3, 2018, 12:37 PM EDT (16:37 UTC)
Expired: Aug 3, 2018, 1:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly

Counties Camden County, NJ, Gloucester County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 16:35 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 12:00Z, 4.6 hours before the alert went out and 213 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: 1395 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

316 
WWUS81 KPHI 031637
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
1237 PM EDT FRI AUG 3 2018

NJZ016>019-PAZ071-104-106-031715-
Northwestern Burlington-Salem-Camden-Gloucester-Lower Bucks-Eastern
Montgomery-Philadelphia-
1237 PM EDT FRI AUG 3 2018

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL SALEM...
NORTHWESTERN CAMDEN...NORTHWESTERN GLOUCESTER...NORTHWESTERN
BURLINGTON AND PHILADELPHIA COUNTIES...

At 1237 PM EDT, a strong thunderstorm was located over Mullica Hill,
or 11 miles southwest of Gloucester City, moving northeast at 30 mph.

Winds up to 45 mph are possible with this storm.

Locations impacted include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Bensalem,
Evesham, Mount Laurel, Willingboro, Deptford, Voorhees, Medford, West
Deptford, Glassboro, Lindenwold, Lumberton, Bellmawr, Woodbury, Mount
Holly, Pitman and Clayton.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3961 7518 3973 7537 3985 7528 3987 7521
      3987 7525 4015 7504 3997 7470
TIME...MOT...LOC 1637Z 218DEG 27KT 3974 7522 

$$

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 9:35 PM EDT	Special Weather Statement	PHI	Somerset	25 min
Aug 2, 10:05 PM EDT	Special Weather Statement	PHI	Morris, Somerset	55 min
Aug 3, 11:47 AM EDT	Special Marine Warning	PHI		88 min
Aug 3, 12:17 PM EDT	Special Weather Statement	PHI	Cape May	43 min
Aug 3, 12:52 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cape May, Cumberland	21 min
Aug 3, 1:01 PM EDT	Special Weather Statement	PHI	Hunterdon	44 min
Aug 3, 1:14 PM EDT	Special Weather Statement	PHI	Mercer	46 min
Aug 3, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	48 min
Aug 3, 1:42 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	63 min
Aug 3, 2:00 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	30 min
Aug 3, 2:37 PM EDT	Special Weather Statement	PHI	Morris, Sussex	38 min
Aug 3, 2:54 PM EDT	Special Marine Warning	PHI		20 min
Aug 3, 3:33 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	57 min
Aug 3, 4:31 PM EDT	Special Weather Statement	PHI	Salem	59 min
Aug 3, 4:45 PM EDT	Special Weather Statement	PHI	Warren	60 min
Aug 3, 5:25 PM EDT	Special Weather Statement	PHI	Monmouth, Ocean	50 min
Aug 3, 5:27 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	63 min
Aug 3, 6:52 PM EDT	Special Weather Statement	PHI	Sussex, Warren	113 min
Aug 3, 7:56 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Aug 3, 3:42 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	63 min
Aug 3, 5:45 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	60 min
Aug 3, 7:37 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Aug 3, 3:29 PM EDT	Special Weather Statement	PHI	Sussex	46 min

Nearby

Special Weather Statements in New Jersey, 2018 Special Weather Statements in Pennsylvania, 2018 Every special weather statement in 2018

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.