Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 93, NWS Philadelphia/Mount Holly

August 13, 20135 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2013, 8:44 AM EDT for 5 counties in New Jersey. It was in force for 61 min. 7 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
Aug 13, 2013, 8:44 AM EDT (12:44 UTC)
Expired
Aug 13, 2013, 9:45 AM EDT
In force
61 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 12:43 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

TimeReportWhereRemark
Aug 13, 8:45 AM EDTTSTM WND DMGClayton, NJTREES AND WIRES DOWN
Aug 13, 9:00 AM EDTTSTM WND DMGMonroe Twp, NJTREES... POWER LINES DOWN...LINES DOWN...7000 PEOPLE WITHOUT POWER
Aug 13, 9:13 AM EDTTSTM WND DMGHammonton, NJTREES AND WIRES DOWN
Aug 13, 9:13 AM EDTTSTM WND DMGShamong Twp, NJROOF BLOWN OFF A BARN.
Aug 13, 9:15 AM EDTTSTM WND DMGShamong Twp, NJOLD FARM HOUSE ROOF BLOWN OFF AT CORNER OF INDIAN MILLS ROAD AND OAKSHADE
Aug 13, 9:22 AM EDTTSTM WND DMGIndian Mills, NJSEVERAL HOUSES DAMAGED AND TREES UPROOTED
Aug 13, 9:45 AM EDTTSTM WND DMGMonroe Twp, NJTREES... POWER LINES DOWN...LINES DOWN...7000 PEOPLE WITHOUT POWER

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 0.7 hours before the alert went out and 116 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, Phillips Aaf/Abe, MD at 12:00Z on 2013-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1840 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2013-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 square meters per square second.19395878Sfc1 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
1840 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

083 
WUUS51 KPHI 131244
SVRPHI
NJC001-005-007-015-033-131345-
/O.NEW.KPHI.SV.W.0093.130813T1244Z-130813T1345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
844 AM EDT TUE AUG 13 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...
  EAST CENTRAL SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 945 AM EDT

* AT 839 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  TURNERSVILLE TO FRANKLINVILLE TO ELMER...MOVING EAST AT 30 MPH.
  THESE STORMS ARE CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WILLIAMSTOWN AND SICKLERVILLE AROUND 850 AM EDT...
  ATCO AND NEWFIELD AROUND 855 AM EDT...
  VICTORY LAKES AND CHESILHURST AROUND 900 AM EDT...
  SHAMONG AND HAMMONTON AROUND 920 AM EDT...
  WHARTON STATE FOREST AND ELWOOD-MAGNOLIA AROUND 930 AM EDT...
  BATSTO AROUND 935 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS
SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM ON THE LOWEST
FLOOR.

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.

&&

LAT...LON 3967 7441 3952 7459 3953 7502 3957 7506
      3954 7507 3954 7519 3964 7515 3978 7507
      3985 7443 3984 7443 3982 7441
TIME...MOT...LOC 1243Z 266DEG 24KT 3975 7501 3963 7509
          3957 7512

$$

FORECASTER:   DRAG
2 follow-up statements
142 
WWUS51 KPHI 131251
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
851 AM EDT TUE AUG 13 2013

NJC033-131300-
/O.CAN.KPHI.SV.W.0093.000000T0000Z-130813T1345Z/
SALEM NJ-
851 AM EDT TUE AUG 13 2013

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL SALEM COUNTY 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 3952 7459 3953 7501 3960 7511 3964 7510
      3979 7502 3985 7443 3982 7441 3967 7441
TIME...MOT...LOC 1250Z 266DEG 24KT 3978 7493 3966 7503
          3958 7505

$$

NJC001-005-007-015-131345-
/O.CON.KPHI.SV.W.0093.000000T0000Z-130813T1345Z/
CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-ATLANTIC NJ-
851 AM EDT TUE AUG 13 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM EDT
FOR NORTHWESTERN ATLANTIC...SOUTHERN BURLINGTON...SOUTHEASTERN
GLOUCESTER AND SOUTHEASTERN CAMDEN COUNTIES...

AT 848 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING ONE INCH
DIAMETER HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM PINE VALLEY TO 
CLAYTON TO MALAGA...MOVING EAST AT 30 MPH.  THERE WAS A REPORT OF 
ESTIMATED WIND TO 60 MPH NEAR GLASSBORO AT 830 AM. 

SEVERE THUNDERSTORMS WILL BE NEAR...
WILLIAMSTOWN AND NEWFIELD AROUND 855 AM EDT...
VICTORY LAKES AND CHESILHURST AROUND 900 AM EDT...
COLLINGS LAKES AROUND 910 AM EDT...
FOLSOM AROUND 915 AM EDT...
SHAMONG AND HAMMONTON AROUND 920 AM EDT...
WHARTON STATE FOREST AND ELWOOD-MAGNOLIA AROUND 930 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN THIS STORM. WHILE
NOT IMMEDIATELY LIKELY...A TORNADO MAY DEVELOP. IF A TORNADO IS
SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE...AND STAY AWAY FROM
WINDOWS.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 3952 7459 3953 7501 3960 7511 3964 7510
      3979 7502 3985 7443 3982 7441 3967 7441
TIME...MOT...LOC 1250Z 266DEG 24KT 3978 7493 3966 7503
          3958 7505

$$

FORECASTER:  DRAG
295 
WWUS51 KPHI 131318
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
918 AM EDT TUE AUG 13 2013

NJC015-131327-
/O.CAN.KPHI.SV.W.0093.000000T0000Z-130813T1345Z/
GLOUCESTER NJ-
918 AM EDT TUE AUG 13 2013

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GLOUCESTER COUNTY
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 3955 7456 3960 7486 3973 7483 3981 7478
      3985 7443 3984 7443 3982 7441 3967 7441
TIME...MOT...LOC 1317Z 266DEG 24KT 3982 7470 3970 7472
          3961 7478

$$

NJC001-005-007-131345-
/O.CON.KPHI.SV.W.0093.000000T0000Z-130813T1345Z/
CAMDEN NJ-BURLINGTON NJ-ATLANTIC NJ-
918 AM EDT TUE AUG 13 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 AM EDT
FOR NORTH CENTRAL ATLANTIC...SOUTHEASTERN BURLINGTON AND SOUTHEASTERN
CAMDEN COUNTIES...

AT 913 AM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING ONE INCH DIAMETER HAIL...AND DESTRUCTIVE WINDS IN EXCESS
OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
SHAMONG TO ATSION TO HAMMONTON...MOVING EAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
WHARTON STATE FOREST AND ELWOOD-MAGNOLIA AROUND 925 AM EDT...
BATSTO AROUND 930 AM EDT...
CHATSWORTH AROUND 940 AM EDT...
PENN STATE FOREST AND WADING RIVER AROUND 945 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME ROTATION WITHIN A COUPLE OF THESE 
STORMS. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY DEVELOP. IF A 
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A 
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND LARGE HAIL.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE...AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 3955 7456 3960 7486 3973 7483 3981 7478
      3985 7443 3984 7443 3982 7441 3967 7441
TIME...MOT...LOC 1317Z 266DEG 24KT 3982 7470 3970 7472
          3961 7478

$$

FORECASTER:  DRAG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 2:45 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 6 more9 hr
Aug 13, 6:23 AM EDTSevere Thunderstorm WarningPHISalem67 min
Aug 13, 7:05 AM EDTSevere Thunderstorm WarningPHICamden, Gloucester, Salem40 min
Aug 13, 7:11 AM EDTSpecial Marine WarningPHI19 min
Aug 13, 7:16 AM EDTSpecial Weather StatementPHICamden, Gloucester, Salem59 min
Aug 13, 7:22 AM EDTAreal Flood AdvisoryPHICamden, Gloucester, Salem7 hr
Aug 13, 7:33 AM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Warren7 hr
Aug 13, 7:51 AM EDTSpecial Marine WarningPHI24 min
Aug 13, 7:54 AM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Salem8 hr
Aug 13, 7:54 AM EDTSpecial Weather StatementPHICamden66 min
Aug 13, 7:57 AM EDTSevere Thunderstorm WarningPHIGloucester, Salem48 min
Aug 13, 8:20 AM EDTFlash Flood WarningPHIHunterdon, Mercer8 hr
Aug 13, 8:36 AM EDTSpecial Weather StatementPHIMercer39 min
Aug 13, 8:59 AM EDTFlash Flood WarningPHIAtlantic, Burlington, Camden, Gloucester7 hr
Aug 13, 9:07 AM EDTSpecial Weather StatementPHICumberland, Salem38 min
Aug 13, 9:11 AM EDTSpecial Weather StatementPHIBurlington49 min
Aug 13, 9:22 AM EDTSevere Thunderstorm WarningPHIBurlington, Ocean38 min
Aug 13, 9:26 AM EDTSpecial Weather StatementPHIAtlantic34 min
Aug 13, 9:34 AM EDTSpecial Marine WarningPHI56 min
Aug 13, 9:42 AM EDTFlash Flood WarningPHIAtlantic, Burlington, Cape May, Cumberland, Hunterdon, Middlesex and 4 more5 hr
Aug 13, 9:43 AM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Ocean47 min
Aug 13, 9:49 AM EDTSpecial Weather StatementPHIAtlantic, Cumberland56 min
Aug 13, 10:01 AM EDTSpecial Weather StatementPHIMonmouth29 min
Aug 13, 10:04 AM EDTSpecial Weather StatementPHIOcean41 min
Aug 13, 10:12 AM EDTTornado WarningPHIOcean33 min
Aug 13, 10:32 AM EDTSevere Thunderstorm WarningPHIOcean28 min
Aug 13, 10:39 AM EDTSpecial Marine WarningPHI66 min
Aug 13, 10:51 AM EDTSpecial Weather StatementPHIAtlantic54 min
Aug 13, 11:51 AM EDTSpecial Marine WarningPHI84 min
Aug 13, 1:10 PM EDTSpecial Marine WarningPHI65 min
Aug 13, 2:18 PM EDTAreal Flood WarningPHIBurlington, Camden, Gloucester, Salem9 hr
Aug 13, 3:30 PM EDTSmall Craft AdvisoryPHI24 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.