Alert archive / Pennsylvania / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2015Gloucester County, New Jersey; Chester County, Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2015, 4:12 AM EDT for Gloucester County, New Jersey; Chester County, Delaware County, Pennsylvania. It was in force for 63 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 4, 2015, 4:12 AM EDT (08:12 UTC)
Expired: Aug 4, 2015, 5:15 AM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly

Counties Gloucester County, NJ, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 110 km from the middle of the area, began a volume at 08:16 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.2 hours before the alert went out and 162 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: 627 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1863 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

429 
WWUS81 KPHI 040812
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
412 AM EDT TUE AUG 4 2015
 
DEZ001-MDZ008-NJZ016-017-PAZ070-071-101-102-040915-
NEW CASTLE-CECIL-SALEM-GLOUCESTER-WESTERN
CHESTER-PHILADELPHIA-EASTERN CHESTER-DELAWARE-
412 AM EDT TUE AUG 4 2015

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN NEW CASTLE... 
NORTHWESTERN CECIL...NORTHWESTERN SALEM... NORTHWESTERN 
GLOUCESTER...DELAWARE...SOUTHERN CHESTER...SOUTHWESTERN PHILADELPHIA 
AND SOUTHEASTERN MONTGOMERY COUNTIES...

AT 411 AM EDT...A STRONG THUNDERSTORM WAS OVER WAKEFIELD...OR 14
MILES SOUTH OF WILLOW STREET...MOVING EAST AT 50 MPH.

WIND GUSTS UP TO 50 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
PHILADELPHIA...WILMINGTON...NEWARK...WEST CHESTER...CALVERT...
CHESTER...DEPTFORD...WEST DEPTFORD...GLASSBORO...PENNSVILLE...
COATESVILLE...YEADON...WESTTOWN...WOODBURY...PITMAN...CARNEYS
POINT...FOLCROFT...SWARTHMORE...ELSMERE AND PAULSBORO.

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 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 3972 7614 3974 7612 3973 7610 3976 7606
      3983 7604 3987 7599 3995 7600 4000 7597
      3998 7514 3965 7513 3965 7553 3971 7549
      3972 7551 3965 7558 3965 7616 3972 7623
TIME...MOT...LOC 0811Z 265DEG 45KT 3979 7619 
$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 2:07 AM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Somerset	53 min
Aug 4, 2:30 AM EDT	Special Weather Statement	PHI	Morris, Warren	60 min
Aug 4, 2:56 AM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	64 min
Aug 4, 3:33 AM EDT	Special Marine Warning	PHI		57 min
Aug 4, 3:36 AM EDT	Special Weather Statement	PHI	Morris	24 min
Aug 4, 4:20 AM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	33 min
Aug 4, 5:25 AM EDT	Special Weather Statement	PHI	Monmouth	65 min
Aug 4, 10:53 AM EDT	Rip Current Statement	PHI	Cape May	4 hr
Aug 4, 12:06 AM EDT	Special Weather Statement	PHI	Chester	54 min
Aug 4, 12:45 AM EDT	Special Weather Statement	PHI	Bucks, Chester, Montgomery, Philadelphia	60 min
Aug 4, 1:23 AM EDT	Special Weather Statement	PHI	Berks	37 min
Aug 4, 1:31 AM EDT	Severe Thunderstorm Warning	PHI	Berks	44 min
Aug 4, 1:42 AM EDT	Special Weather Statement	PHI	Carbon	48 min
Aug 4, 1:54 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	50 min
Aug 4, 5:18 AM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	57 min
Aug 4, 5:37 AM EDT	Severe Thunderstorm Warning	PHI	Cecil, Kent, Queen Anne's	34 min
Aug 4, 6:11 PM EDT	Special Weather Statement	PHI	Sussex	64 min
Aug 4, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	20 min

Nearby

Special Weather Statements in Pennsylvania, 2015 Special Weather Statements in New Jersey, 2015 Every special weather statement in 2015

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.