Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 20, NWS Philadelphia/Mount Holly

June 13, 20134 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 13, 2013, 9:18 AM EDT for 4 states. It was in force for 57 min. 8 reports 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: Jun 13, 2013, 9:18 AM EDT (13:18 UTC)
Expired: Jun 13, 2013, 10:15 AM EDT
In force: 57 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Cecil County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 13:21 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
Jun 13, 9:39 AM EDT	HAIL 0.25	Conshohocken, PA
Jun 13, 9:47 AM EDT	TSTM WND GST 57	Woodbury, NJ
Jun 13, 9:47 AM EDT	HAIL 0.25	Woodbury, NJ
Jun 13, 10:00 AM EDT	TSTM WND DMG	New Castle, DE	SEVERAL TREES WERE DOWNED AND ONE TREE RESTING ON HOUSE. ONE REPORT OF WIRES DOWN.
Jun 13, 10:02 AM EDT	HAIL 0.25	Haddonfield, NJ
Jun 13, 10:15 AM EDT	TSTM WND DMG	Deerfield, NJ	FOUR POWER POLES ON MORTON AVENUE WERE DOWN
Jun 13, 10:15 AM EDT	TSTM WND DMG	Deerfield Twp, NJ	SEVERAL POWER POLES SNAPPED AND FELL ONTO MORTON AVENUE.
Jun 13, 10:20 AM EDT	HAIL 0.25	Bridgeton, NJ

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 13, 7:30 AM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 1.3 hours before the alert went out and 64 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: 416 J/kg
Mixed-layer CIN: -188 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

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

832 
WUUS51 KPHI 131318
SVRPHI
DEC003-MDC015-NJC001-005-007-011-015-033-PAC029-045-091-101-131415-
/O.NEW.KPHI.SV.W.0020.130613T1318Z-130613T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
918 AM EDT THU JUN 13 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  EAST CENTRAL CECIL COUNTY IN NORTHEAST MARYLAND...
  EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  WESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1015 AM EDT

* AT 912 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  AUDUBON TO ASHLAND TO HOLLYWOOD BEACH...MOVING EAST AT 60 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  NEW CASTLE AND SWARTHMORE AROUND 925 AM EDT...
  DELAWARE CITY AND YEADON AROUND 930 AM EDT...
  GLOUCESTER CITY AND CAMDEN AROUND 935 AM EDT...
  RIVERSIDE AND PALMYRA AROUND 940 AM EDT...
  WILLINGBORO AND CHERRY HILL AROUND 945 AM EDT...
  SHILOH AND MOUNT HOLLY AROUND 950 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SPECTATORS AND PLAYERS AT THE U.S. OPEN SHOULD BE TAKING SHELTER.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS...WHICH COULD FLOOD LOW LYING AREAS QUICKLY AND COVER
ROADS WITH WATER. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

NEARLY CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS
LINE OF SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS!
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3949 7599 3975 7566 4011 7547 4006 7498
      4005 7497 4006 7495 4002 7459 3926 7492
      3937 7541 3943 7547 3946 7555 3957 7552
      3959 7555 3951 7555 3947 7558 3939 7552
TIME...MOT...LOC 1317Z 266DEG 51KT 4011 7534 3978 7556
          3950 7588

$$

FORECASTER: GORSE

2 follow-up statements

418 
WWUS51 KPHI 131342
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
942 AM EDT THU JUN 13 2013

PAC029-131351-
/O.CAN.KPHI.SV.W.0020.000000T0000Z-130613T1415Z/
CHESTER PA-
942 AM EDT THU JUN 13 2013

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CHESTER COUNTY IS
CANCELLED...

THE LINE OF STORMS THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS 
MOVED OUT OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING 
HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 3980 7545 4009 7530 4002 7459 3926 7492
      3937 7541 3943 7547 3946 7555 3957 7552
      3959 7555 3951 7555 3947 7558 3939 7552
      3949 7599
TIME...MOT...LOC 1341Z 266DEG 51KT 4007 7503 3973 7522
          3946 7557

$$

DEC003-MDC015-NJC001-005-007-011-015-033-PAC045-091-101-131415-
/O.CON.KPHI.SV.W.0020.000000T0000Z-130613T1415Z/
CAMDEN NJ-MONTGOMERY PA-PHILADELPHIA PA-DELAWARE PA-GLOUCESTER NJ-
NEW CASTLE DE-CECIL MD-BURLINGTON NJ-ATLANTIC NJ-SALEM NJ-
CUMBERLAND NJ-
942 AM EDT THU JUN 13 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT
FOR CUMBERLAND...SALEM...NORTHWESTERN ATLANTIC...WESTERN
BURLINGTON...EAST CENTRAL CECIL...NEW CASTLE...GLOUCESTER...EASTERN
DELAWARE...PHILADELPHIA...SOUTHEASTERN MONTGOMERY AND CAMDEN
COUNTIES...

AT 938 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING ONE INCH
DIAMETER HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM TACONY TO SWEDESBORO TO
ODESSA...MOVING EAST AT 60 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
WILLINGBORO AND STRATFORD AROUND 950 AM EDT...
SHILOH AND PINE VALLEY AROUND 955 AM EDT...
WILLIAMSTOWN AND OLIVET AROUND 1000 AM EDT...
VICTORY LAKES AND PEMBERTON AROUND 1005 AM EDT...
VINELAND AND COLLINGS LAKES AROUND 1010 AM EDT...
MIZPAH AROUND 1015 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO 
GROUND LIGHTNING IS OCCURRING WITH THIS LINE OF STORMS. MOVE INDOORS 
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE, WITH SOME FLOODING
IN POOR DRAINAGE AREAS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3980 7545 4009 7530 4002 7459 3926 7492
      3937 7541 3943 7547 3946 7555 3957 7552
      3959 7555 3951 7555 3947 7558 3939 7552
      3949 7599
TIME...MOT...LOC 1341Z 266DEG 51KT 4007 7503 3973 7522
          3946 7557

$$

FORECASTER: GORSE

225 
WWUS51 KPHI 131347
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
947 AM EDT THU JUN 13 2013

DEC003-MDC015-NJC001-005-007-011-015-033-PAC045-091-101-131415-
/O.CON.KPHI.SV.W.0020.000000T0000Z-130613T1415Z/
CAMDEN NJ-MONTGOMERY PA-PHILADELPHIA PA-DELAWARE PA-GLOUCESTER NJ-
NEW CASTLE DE-CECIL MD-BURLINGTON NJ-ATLANTIC NJ-SALEM NJ-
CUMBERLAND NJ-
947 AM EDT THU JUN 13 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT
FOR CUMBERLAND...SALEM...NORTHWESTERN ATLANTIC...WESTERN
BURLINGTON...EAST CENTRAL CECIL...NEW CASTLE...GLOUCESTER...EASTERN
DELAWARE...PHILADELPHIA...SOUTHEASTERN MONTGOMERY AND CAMDEN
COUNTIES...

AT 942 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING ONE INCH
DIAMETER HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM HOLMESBURG TO MULLICA HILL
TO HOPE CREEK...MOVING EAST AT 60 MPH.

AT 944 AM EDT...A TRAINED SPOTTER IN WOODBURY, GLOUCESTER COUNTY NEW 
JERSEY, REPORTED A WIND GUST TO 57 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
WILLINGBORO AND STRATFORD AROUND 950 AM EDT...
SHILOH AND PINE VALLEY AROUND 955 AM EDT...
WILLIAMSTOWN AND OLIVET AROUND 1000 AM EDT...
VICTORY LAKES AND PEMBERTON AROUND 1005 AM EDT...
VINELAND AND COLLINGS LAKES AROUND 1010 AM EDT...
MIZPAH AND CUMBERLAND AROUND 1015 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO 
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS 
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. 
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE 
STRUCK BY LIGHTNING.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE, WITH SOME FLOODING 
IN POOR DRAINAGE AREAS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM EDT
THURSDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

&&

LAT...LON 3980 7545 4009 7530 4002 7459 3926 7492
      3937 7541 3943 7547 3946 7555 3957 7552
      3959 7555 3951 7555 3947 7558 3939 7552
      3949 7599
TIME...MOT...LOC 1345Z 266DEG 51KT 4007 7495 3973 7515
          3946 7550

$$

FORECASTER: GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 9:47 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset and 1 more	58 min
Jun 13, 9:58 AM EDT	Special Marine Warning	PHI		62 min
Jun 13, 10:03 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	57 min
Jun 13, 10:26 AM EDT	Special Marine Warning	PHI		94 min
Jun 13, 10:43 AM EDT	Special Marine Warning	PHI		2 hr
Jun 13, 10:50 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	55 min
Jun 13, 10:58 AM EDT	Special Marine Warning	PHI		62 min
Jun 13, 11:01 AM EDT	Special Weather Statement	PHI	Ocean	29 min
Jun 13, 11:27 AM EDT	Special Marine Warning	PHI		63 min
Jun 13, 4:46 PM EDT	Special Marine Warning	PHI		59 min
Jun 13, 4:56 PM EDT	Special Marine Warning	PHI		64 min
Jun 13, 5:26 PM EDT	Special Weather Statement	PHI	Cumberland	64 min
Jun 13, 5:27 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Salem	4 hr
Jun 13, 5:38 PM EDT	Special Weather Statement	PHI	Atlantic	67 min
Jun 13, 5:40 PM EDT	Special Marine Warning	PHI		65 min
Jun 13, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	58 min
Jun 13, 5:51 PM EDT	Special Marine Warning	PHI		54 min
Jun 13, 5:56 PM EDT	Special Marine Warning	PHI		64 min
Jun 13, 6:17 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	58 min
Jun 13, 6:31 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	4 hr
Jun 13, 6:40 PM EDT	Special Marine Warning	PHI		95 min
Jun 13, 7:50 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Somerset	4 hr
Jun 13, 5:51 AM EDT	Special Weather Statement	PHI	Bucks, Montgomery	69 min
Jun 13, 7:01 AM EDT	Special Weather Statement	PHI	Berks	119 min
Jun 13, 7:29 AM EDT	Special Weather Statement	PHI	Berks	61 min
Jun 13, 8:10 AM EDT	Special Weather Statement	PHI	Chester	50 min
Jun 13, 8:40 AM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	50 min
Jun 13, 1:49 AM EDT	Special Weather Statement	PHI	Sussex	41 min
Jun 13, 9:29 AM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	31 min
Jun 13, 9:39 AM EDT	Special Weather Statement	PHI	Kent	51 min
Jun 13, 9:55 AM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	35 min
Jun 13, 10:24 AM EDT	Special Weather Statement	PHI	Kent, Sussex	81 min
Jun 13, 4:25 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	65 min
Jun 13, 4:51 PM EDT	Special Weather Statement	PHI	Kent	54 min
Jun 13, 5:04 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	4 hr
Jun 13, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent	63 min
Jun 13, 5:19 PM EDT	Special Weather Statement	PHI	New Castle	56 min
Jun 13, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	68 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013 Severe Thunderstorm Warnings in Pennsylvania, 2013 Severe Thunderstorm Warnings in Delaware, 2013 Every severe thunderstorm warning in 2013

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.