Alert archive / New Jersey / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 86, NWS Philadelphia/Mount Holly

July 1, 2015Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2015, 2:17 AM EDT for Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 43 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 1, 2015, 2:17 AM EDT (06:17 UTC)
Expired: Jul 1, 2015, 3:00 AM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Gloucester County, NJ, Salem County, NJ, Delaware County, PA

The radar

The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 06:20 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.

What was reported inside it

Time	Report	Where	Remark
Jul 1, 2:18 AM EDT	TSTM WND DMG	Newark, DE	WIRES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 6.3 hours before the alert went out and 183 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: 665 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

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

448 
WUUS51 KPHI 010617
SVRPHI
DEC003-NJC015-033-PAC045-010700-
/O.NEW.KPHI.SV.W.0086.150701T0617Z-150701T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
217 AM EDT WED JUL 1 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHWESTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 300 AM EDT

* AT 216 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED OVER PIKE CREEK...OR NEAR
  NEWARK...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WILMINGTON...NEWARK...CHESTER...PENNSVILLE...CARNEYS POINT...
  SWARTHMORE...ELSMERE...NEW CASTLE...PENNS GROVE...SWEDESBORO...
  NEWPORT...ARDEN...ELAM...NORTH STAR...TALLEYVILLE...STANTON...
  BEAR...WILMINGTON MANOR...NETHER PROVIDENCE TOWNSHIP AND HOCKESSIN.
 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 3981 7570 3984 7560 3988 7559 3993 7554
      3998 7544 4000 7545 4001 7543 3976 7525
      3965 7553 3971 7549 3972 7551 3971 7551
      3961 7561 3956 7573 3964 7579 3972 7579
TIME...MOT...LOC 0616Z 234DEG 41KT 3972 7573 

$$

1 follow-up statement

262 
WWUS51 KPHI 010639
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
239 AM EDT WED JUL 1 2015

DEC003-010648-
/O.CAN.KPHI.SV.W.0086.000000T0000Z-150701T0700Z/
NEW CASTLE DE-
239 AM EDT WED JUL 1 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3988 7559 3993 7554 3998 7544 4000 7545
      4001 7543 3976 7525 3974 7547 3975 7547
      3977 7546 3980 7541 3984 7550 3984 7559
TIME...MOT...LOC 0638Z 234DEG 41KT 3987 7546 

$$

NJC015-033-PAC045-010700-
/O.CON.KPHI.SV.W.0086.000000T0000Z-150701T0700Z/
SALEM NJ-GLOUCESTER NJ-DELAWARE PA-
239 AM EDT WED JUL 1 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EDT
FOR NORTHWESTERN SALEM...NORTHWESTERN GLOUCESTER AND SOUTHWESTERN
DELAWARE COUNTIES...

AT 238 AM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS UP TO 50 TO 60 MPH. THIS STORM WAS
LOCATED OVER CHELSEA...OR 9 MILES SOUTHEAST OF WEST CHESTER...MOVING
NORTHEAST AT 45 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE WINDS.


LOCATIONS IMPACTED INCLUDE...
CHESTER...CARNEYS POINT...SWARTHMORE...SWEDESBORO...NETHER PROVIDENCE
TOWNSHIP...CHELSEA...ELAM...CHEYNEY...LIMA...CHESTER TOWNSHIP...
CONCORDVILLE...GRADYVILLE...BECKETT...GIBBSTOWN...BROOKHAVEN...RIDLEY
PARK...MEDIA...UPLAND...CHESTER HEIGHTS AND EDDYSTONE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3988 7559 3993 7554 3998 7544 4000 7545
      4001 7543 3976 7525 3974 7547 3975 7547
      3977 7546 3980 7541 3984 7550 3984 7559
TIME...MOT...LOC 0638Z 234DEG 41KT 3987 7546 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:23 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	4 hr
Jun 30, 8:26 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Jun 30, 9:16 PM EDT	Flash Flood Warning	PHI	Sussex	5 hr
Jul 1, 12:56 AM EDT	Special Weather Statement	PHI	Salem	94 min
Jul 1, 1:39 AM EDT	Flash Flood Warning	PHI	Sussex	4 hr
Jul 1, 2:50 AM EDT	Special Weather Statement	PHI	Mercer	55 min
Jul 1, 3:26 AM EDT	Areal Flood Advisory	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	3 hr
Jul 1, 3:37 AM EDT	Special Weather Statement	PHI	Ocean	68 min
Jul 1, 3:39 AM EDT	Special Marine Warning	PHI		96 min
Jul 1, 3:49 AM EDT	Special Marine Warning	PHI		56 min
Jul 1, 3:49 AM EDT	Small Craft Advisory	PHI		6 hr
Jul 1, 3:49 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		12 hr
Jul 1, 3:54 AM EDT	Areal Flood Advisory	PHI	Morris	2 hr
Jun 30, 8:03 PM EDT	Special Weather Statement	PHI	Philadelphia	27 min
Jun 30, 8:15 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	28 min
Jul 1, 1:42 AM EDT	Severe Thunderstorm Warning	PHI	Chester	48 min
Jul 1, 2:14 AM EDT	Areal Flood Advisory	PHI	Berks, Chester, Delaware, Lehigh, Montgomery, Philadelphia	4 hr
Jul 1, 2:47 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 1, 4:48 AM EDT	Areal Flood Warning	PHI	Monroe	10 hr
Jun 30, 10:40 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Jul 1, 1:13 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	62 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2015 Severe Thunderstorm Warnings in Pennsylvania, 2015 Severe Thunderstorm Warnings in Delaware, 2015 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.