Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 191, NWS Philadelphia/Mount Holly

August 14, 2012Camden County, Gloucester County, Salem County, New Jersey; Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 2012, 9:22 AM EDT for Camden County, Gloucester County, Salem County, New Jersey; Delaware County, Philadelphia County, Pennsylvania; New Castle County, Delaware. It was in force for 38 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: Aug 14, 2012, 9:22 AM EDT (13:22 UTC)
Expired: Aug 14, 2012, 10:00 AM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 13:23 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 1.4 hours before the alert went out and 90 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: 1166 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 256 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.9

Open this sounding in Storm Lab

The text

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

574 
WUUS51 KPHI 141322
SVRPHI
DEC003-NJC007-015-033-PAC045-101-141415-
/O.NEW.KPHI.SV.W.0191.120814T1322Z-120814T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
922 AM EDT TUE AUG 14 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  THIS INCLUDES THE CITY OF WILMINGTON...
  SOUTHERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...GLOUCESTER CITY...CAMDEN...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 1015 AM EDT

* AT 919 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR WILMINGTON...AND MOVING
  NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PENNS GROVE AND ARDEN AROUND 930 AM EDT...
  BECKETT AROUND 940 AM EDT...
  CHESTER AND SWEDESBORO AROUND 945 AM EDT...
  GIBBSTOWN AROUND 950 AM EDT...
  PAULSBORO...PHILADELPHIA INTERNATIONAL AIRPORT AND FOLCROFT AROUND
  955 AM EDT...
  WEST DEPTFORD AROUND 1000 AM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

&&

LAT...LON 3967 7552 3968 7553 3966 7560 3981 7566
      4005 7505 4002 7503 3999 7506 3998 7501
      3997 7502 3995 7502 3994 7498 3993 7498
      3989 7493 3978 7490
TIME...MOT...LOC 1322Z 246DEG 26KT 3973 7554

$$

HEAVENER

1 follow-up statement

558 
WWUS51 KPHI 141400
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1000 AM EDT TUE AUG 14 2012

DEC003-NJC007-015-033-PAC045-101-141409-
/O.CAN.KPHI.SV.W.0191.000000T0000Z-120814T1415Z/
CAMDEN NJ-PHILADELPHIA PA-DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-
SALEM NJ-
1000 AM EDT TUE AUG 14 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SALEM...
NORTHEASTERN NEW CASTLE...NORTHWESTERN GLOUCESTER...SOUTHERN
DELAWARE...SOUTHERN PHILADELPHIA AND NORTHWESTERN CAMDEN COUNTIES IS
CANCELLED...

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

LAT...LON 3967 7552 3968 7553 3966 7560 3981 7566
      4005 7505 4002 7503 3999 7506 3998 7501
      3997 7502 3995 7502 3994 7498 3993 7498
      3989 7493 3978 7490
TIME...MOT...LOC 1359Z 246DEG 26KT 3984 7522

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 9:44 AM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	91 min
Aug 14, 10:07 AM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	83 min
Aug 14, 11:42 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester	3 hr
Aug 14, 2:35 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	78 min
Aug 14, 3:46 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	2 hr
Aug 14, 6:02 AM EDT	Special Weather Statement	PHI	Carbon	88 min
Aug 14, 7:25 AM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	95 min
Aug 14, 8:06 AM EDT	Special Weather Statement	PHI	Chester, Lehigh	84 min
Aug 14, 8:39 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	2 hr
Aug 14, 9:56 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	108 min
Aug 14, 4:12 PM EDT	Special Weather Statement	PHI	Delaware	63 min
Aug 14, 4:15 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	60 min
Aug 14, 12:49 PM EDT	Special Weather Statement	PHI	Sussex	56 min
Aug 14, 2:13 PM EDT	Areal Flood Advisory	PHI	Kent	79 min
Aug 14, 2:28 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	2 hr
Aug 14, 3:01 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	38 min
Aug 14, 3:22 PM EDT	Special Weather Statement	PHI	New Castle	53 min
Aug 14, 4:54 PM EDT	Special Weather Statement	PHI	Kent	66 min
Aug 14, 6:44 PM EDT	Special Weather Statement	PHI	Sussex	61 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Severe Thunderstorm Warnings in Pennsylvania, 2012 Severe Thunderstorm Warnings in Delaware, 2012 Every severe thunderstorm warning in 2012

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.