Alert archive / New Jersey / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 75, NWS Philadelphia/Mount Holly

July 20, 2013Burlington County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2013, 9:38 PM EDT for Burlington County, New Jersey. It was in force for 67 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 20, 2013, 9:38 PM EDT (01:38 UTC)
Expired: Jul 20, 2013, 10:45 PM EDT
In force: 67 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Burlington County, NJ

The radar

The Philadelphia radar (KDIX), 21 km from the middle of the area, began a volume at 01:38 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

Brookhaven, NY (KOKX), launched 00:00Z, 1.6 hours before the alert went out and 187 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: 1732 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

691 
WUUS51 KPHI 210138
SVRPHI
NJC005-210245-
/O.NEW.KPHI.SV.W.0075.130721T0138Z-130721T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
938 PM EDT SAT JUL 20 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1045 PM EDT

* AT 933 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR VOORHEES...MOVING EAST AT
  20 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MEDFORD AROUND 955 PM EDT...
  TABERNACLE AND LEISURETOWNE AROUND 1005 PM EDT...
  PRESIDENTIAL LAKES AROUND 1025 PM EDT...
  CHATSWORTH AROUND 1035 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DAMAGING WINDS UP TO 66 MPH WERE REPORTED AT THE PHILADELPHIA 
INTERNATIONAL AIRPORT WITH THIS SEVERE THUNDERSTORM.

&&

LAT...LON 3974 7443 3976 7479 3979 7483 3994 7483
      3996 7449 3988 7444
TIME...MOT...LOC 0138Z 268DEG 19KT 3984 7490

$$

FORECASTER: HEAVENER

2 follow-up statements

290 
WWUS51 KPHI 210206
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1006 PM EDT SAT JUL 20 2013

NJC005-210245-
/O.CON.KPHI.SV.W.0075.000000T0000Z-130721T0245Z/
BURLINGTON NJ-
1006 PM EDT SAT JUL 20 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT
FOR CENTRAL BURLINGTON COUNTY...

AT 1003 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR TABERNACLE...OR 21
MILES EAST OF GLOUCESTER CITY...MOVING EAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
CHATSWORTH AROUND 1035 PM EDT...
PENN STATE FOREST AROUND 1040 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE FOR DAMAGING WINDS...
LARGE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE
SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING...AWAY
FROM WINDOWS OR EVEN BELOW GROUND LEVEL.

&&

LAT...LON 3989 7474 3989 7445 3974 7443 3976 7475
TIME...MOT...LOC 0206Z 268DEG 19KT 3984 7471

$$

FORECASTER: HEAVENER

061 
WWUS51 KPHI 210225
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1025 PM EDT SAT JUL 20 2013

NJC005-210235-
/O.CAN.KPHI.SV.W.0075.000000T0000Z-130721T0245Z/
BURLINGTON NJ-
1025 PM EDT SAT JUL 20 2013

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BURLINGTON COUNTY IS
CANCELLED...

THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3989 7474 3989 7445 3974 7443 3976 7475
TIME...MOT...LOC 0225Z 268DEG 19KT 3984 7458

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 8:33 PM EDT	Special Weather Statement	PHI	Camden	57 min
Jul 20, 8:39 PM EDT	Special Weather Statement	PHI	Camden	66 min
Jul 20, 8:49 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Jul 20, 9:13 PM EDT	Special Weather Statement	PHI	Ocean	32 min
Jul 20, 9:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	54 min
Jul 20, 9:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	61 min
Jul 20, 10:07 PM EDT	Special Marine Warning	PHI		83 min
Jul 20, 10:46 PM EDT	Special Weather Statement	PHI	Burlington	59 min
Jul 20, 10:52 PM EDT	Special Weather Statement	PHI	Atlantic	53 min
Jul 20, 11:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 21, 3:10 PM EDT	Special Weather Statement	PHI	Ocean	65 min
Jul 21, 3:17 PM EDT	Coastal Flood Advisory	PHI	Middlesex, Monmouth, Ocean	6 hr
Jul 21, 3:44 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	2 hr
Jul 21, 4:16 PM EDT	Special Weather Statement	PHI	Burlington	89 min
Jul 21, 4:20 PM EDT	Areal Flood Advisory	PHI	Burlington	3 hr
Jul 21, 4:44 PM EDT	Special Weather Statement	PHI	Burlington	61 min
Jul 21, 5:03 PM EDT	Areal Flood Advisory	PHI	Burlington	3 hr
Jul 21, 5:18 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	57 min
Jul 21, 5:28 PM EDT	Areal Flood Advisory	PHI	Burlington	3 hr
Jul 21, 5:52 PM EDT	Special Weather Statement	PHI	Ocean	53 min
Jul 21, 6:20 PM EDT	Special Weather Statement	PHI	Atlantic	55 min
Jul 21, 6:33 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	3 hr
Jul 21, 7:02 PM EDT	Special Weather Statement	PHI	Atlantic	88 min
Jul 21, 7:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 21, 7:25 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington	3 hr

Nearby

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