Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 84, NWS Philadelphia/Mount Holly

July 29, 2013Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2013, 1:18 AM EDT for Gloucester County, Salem County, New Jersey; Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 42 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
Jul 29, 2013, 1:18 AM EDT (05:18 UTC)
Expired
Jul 29, 2013, 2:00 AM EDT
In force
42 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), 92 km from the middle of the area, began a volume at 05:20 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 5.3 hours before the alert went out and 190 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2013-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 957 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2013-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
957 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1152 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-1.4

Open this sounding in Storm Lab

The text

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

944 
WUUS51 KPHI 290518
SVRPHI
DEC003-NJC015-033-PAC045-290600-
/O.NEW.KPHI.SV.W.0084.130729T0518Z-130729T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
118 AM EDT MON JUL 29 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 200 AM EDT

* AT 116 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR EDGEMOOR...MOVING EAST AT
  30 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ARDEN AND CHELSEA AROUND 125 AM EDT...
  BECKETT AND CHESTER AROUND 135 AM EDT...
  SWEDESBORO AND SWARTHMORE AROUND 140 AM EDT...
  GIBBSTOWN AND PHILADELPHIA INTERNATIONAL ARPT AROUND 145 AM EDT...
  PAULSBORO AND MULLICA HILL AROUND 150 AM EDT...
  WEST DEPTFORD AROUND 155 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

&&

LAT...LON 3984 7560 3987 7559 3992 7525 3988 7526
      3987 7520 3969 7513 3965 7554 3969 7552
      3969 7553 3965 7557 3968 7560 3983 7564
TIME...MOT...LOC 0518Z 257DEG 24KT 3975 7551

$$

IOVINO
2 follow-up statements
120 
WWUS51 KPHI 290535
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
135 AM EDT MON JUL 29 2013

DEC003-NJC033-290543-
/O.CAN.KPHI.SV.W.0084.000000T0000Z-130729T0600Z/
NEW CASTLE DE-SALEM NJ-
135 AM EDT MON JUL 29 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALEM AND
NORTHEASTERN NEW CASTLE COUNTIES IS CANCELLED...

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

LAT...LON 3987 7559 3992 7525 3988 7526 3987 7520
      3969 7513 3968 7526 3969 7531 3973 7538
      3979 7541 3978 7544 3979 7541 3981 7543
      3984 7551 3984 7560
TIME...MOT...LOC 0533Z 257DEG 24KT 3977 7538

$$

NJC015-PAC045-290600-
/O.CON.KPHI.SV.W.0084.000000T0000Z-130729T0600Z/
DELAWARE PA-GLOUCESTER NJ-
135 AM EDT MON JUL 29 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR NORTHWESTERN GLOUCESTER AND SOUTHERN DELAWARE COUNTIES...

AT 132 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS.
THIS STORM WAS LOCATED NEAR CHESTER...PENNSYLVANIA AND LOGAN 
TOWNSHIP...NEW JERSEY. IT WAS MOVING EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
SWEDESBORO AND EDDYSTONE AROUND 140 AM EDT...
GIBBSTOWN AROUND 145 AM EDT...
PAULSBORO AND MULLICA HILL AROUND 150 AM EDT...
WEST DEPTFORD AROUND 155 AM EDT...

LAT...LON 3987 7559 3992 7525 3988 7526 3987 7520
      3969 7513 3968 7526 3969 7531 3973 7538
      3979 7541 3978 7544 3979 7541 3981 7543
      3984 7551 3984 7560
TIME...MOT...LOC 0533Z 257DEG 24KT 3977 7538

$$

IOVINO
422 
WWUS51 KPHI 290547
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
147 AM EDT MON JUL 29 2013

NJC015-PAC045-290557-
/O.CAN.KPHI.SV.W.0084.000000T0000Z-130729T0600Z/
DELAWARE PA-GLOUCESTER NJ-
147 AM EDT MON JUL 29 2013

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GLOUCESTER AND
SOUTHERN DELAWARE COUNTIES IS CANCELLED...

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

LAT...LON 3987 7559 3992 7525 3988 7526 3987 7520
      3969 7513 3968 7526 3969 7531 3973 7538
      3979 7541 3978 7544 3979 7541 3981 7543
      3984 7551 3984 7560
TIME...MOT...LOC 0547Z 257DEG 24KT 3978 7526

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 8:15 PM EDTAreal Flood WarningPHIHunterdon, Morris, Somerset8 hr
Jul 28, 8:25 PM EDTAreal Flood AdvisoryPHICumberland, Gloucester, Salem3 hr
Jul 28, 8:38 PM EDTSpecial Weather StatementPHISalem52 min
Jul 28, 9:04 PM EDTFlash Flood WarningPHICamden, Cumberland, Gloucester, Salem4 hr
Jul 28, 9:12 PM EDTAreal Flood AdvisoryPHIBurlington4 hr
Jul 28, 9:19 PM EDTSpecial Weather StatementPHISalem41 min
Jul 28, 10:02 PM EDTSpecial Weather StatementPHICumberland43 min
Jul 28, 10:16 PM EDTSpecial Weather StatementPHICamden29 min
Jul 28, 10:17 PM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester11 hr
Jul 28, 10:22 PM EDTAreal Flood AdvisoryPHIAtlantic, Cumberland4 hr
Jul 28, 11:01 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Ocean4 hr
Jul 28, 11:06 PM EDTSpecial Weather StatementPHIAtlantic, Ocean39 min
Jul 28, 11:25 PM EDTSpecial Marine WarningPHI50 min
Jul 28, 11:29 PM EDTSpecial Weather StatementPHIOcean31 min
Jul 29, 12:02 AM EDTSpecial Weather StatementPHIOcean28 min
Jul 29, 12:39 AM EDTSpecial Weather StatementPHISalem66 min
Jul 29, 1:38 AM EDTSpecial Weather StatementPHIBurlington, Camden, Gloucester67 min
Jul 29, 1:45 AM EDTSpecial Weather StatementPHISussex, Warren60 min
Jul 29, 2:38 AM EDTSpecial Weather StatementPHISussex52 min
Jul 29, 5:13 AM EDTAreal Flood WarningPHICumberland, Salem6 hr
Jul 28, 8:17 PM EDTAreal Flood AdvisoryPHICarbon, Monroe118 min
Jul 28, 8:39 PM EDTAreal Flood WarningPHIChester4 hr
Jul 28, 9:45 PM EDTAreal Flood AdvisoryPHICarbon, Monroe6 hr
Jul 28, 11:46 PM EDTAreal Flood AdvisoryPHIChester4 hr
Jul 28, 11:54 PM EDTSevere Thunderstorm WarningPHIChester51 min
Jul 29, 12:24 AM EDTAreal Flood AdvisoryPHIChester, Delaware4 hr
Jul 29, 12:28 AM EDTSpecial Weather StatementPHICarbon, Lehigh62 min
Jul 29, 12:45 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton4 hr
Jul 29, 1:05 AM EDTSpecial Weather StatementPHILehigh, Monroe, Northampton55 min
Jul 28, 8:06 PM EDTAreal Flood AdvisoryPHIKent, New Castle, Sussex4 hr
Jul 28, 9:01 PM EDTSpecial Weather StatementPHISussex44 min
Jul 28, 9:38 PM EDTSpecial Weather StatementPHISussex67 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2013Severe Thunderstorm Warnings in Pennsylvania, 2013Severe Thunderstorm Warnings in Delaware, 2013Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.