Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 157, NWS Philadelphia/Mount Holly

August 4, 2012Burlington County, Camden County, New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 4, 2012, 1:26 PM EDT for Burlington County, Camden County, New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 34 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 4, 2012, 1:26 PM EDT (17:26 UTC)
Expired: Aug 4, 2012, 2:00 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Burlington County, NJ, Camden County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 17:28 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
Aug 4, 1:28 PM EDT	HAIL 0.25	Mount Laurel, NJ	PEA SIZE HAIL REPORTED IN MOUNT LAUREL.
Aug 4, 1:30 PM EDT	TSTM WND DMG	Cherry Hill, NJ	TREES AND WIRES DOWN IN CHERRY HILL.
Aug 4, 1:30 PM EDT	TSTM WND DMG	Pennsauken, NJ	TREES AND WIRES DOWN IN PENNSAUKEN.
Aug 4, 1:35 PM EDT	TSTM WND DMG	Cinnaminson, NJ	WIRES DOWN IN CINNAMINSON.
Aug 4, 1:40 PM EDT	HAIL 0.5	Glenside, PA
Aug 4, 1:41 PM EDT	TSTM WND DMG	Maple Shade, NJ	WIRES DOWN IN MAPLE SHADE.
Aug 4, 1:45 PM EDT	TSTM WND DMG	Abington Twp, PA	TREES AND WIRES DOWN IN ABINGTON TWP.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 213 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: 2028 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

618 
WUUS51 KPHI 041726
SVRPHI
NJC005-007-PAC017-091-101-041800-
/O.NEW.KPHI.SV.W.0157.120804T1726Z-120804T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
126 PM EDT SAT AUG 4 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...

* UNTIL 200 PM EDT

* AT 125 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CHERRY HILL AND CAMDEN...AND MOVING NORTH AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PALMYRA AROUND 135 PM EDT...
  WISSINOMING AROUND 140 PM EDT...
  TACONY AROUND 145 PM EDT...
  HOLMESBURG AROUND 150 PM EDT...
  RIVERSIDE AND WILLINGBORO AROUND 155 PM EDT...
  ANDALUSIA...BEVERLY...BENSALEM AND NORTHEAST PHILADELPHIA AROUND
  200 PM 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.

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 3979 7491 3984 7509 3987 7513 3989 7514
      3988 7520 3990 7525 4021 7511 4010 7468
TIME...MOT...LOC 1726Z 202DEG 12KT 3995 7501

$$

IOVINO

1 follow-up statement

911 
WWUS51 KPHI 041744
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
144 PM EDT SAT AUG 4 2012

NJC005-007-PAC017-091-101-041800-
/O.CON.KPHI.SV.W.0157.000000T0000Z-120804T1800Z/
CAMDEN NJ-BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-BURLINGTON NJ-
144 PM EDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHWESTERN BURLINGTON...NORTHERN PHILADELPHIA...SOUTHEASTERN
MONTGOMERY...SOUTHEASTERN BUCKS AND NORTHWESTERN CAMDEN COUNTIES...

AT 142 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CINNAMINSON...OR 8 MILES NORTHEAST OF CAMDEN...MOVING
NORTH AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOLMESBURG BY 150 PM EDT...
  RIVERSIDE AND 7 MILES EAST OF ROCKLEDGE BY 155 PM EDT...
  DELANCO...ANDALUSIA...BEVERLY AND CORNWELLS HEIGHTS-EDDINGTON BY
  200 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4012 7476 3988 7490 4001 7520 4021 7511
TIME...MOT...LOC 1744Z 202DEG 12KT 4001 7498

$$

HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Salem	62 min
Aug 4, 2:28 PM EDT	Special Marine Warning	PHI		62 min
Aug 4, 2:53 PM EDT	Special Weather Statement	PHI	Mercer	67 min
Aug 4, 3:21 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	54 min
Aug 4, 3:35 PM EDT	Special Marine Warning	PHI		38 min
Aug 4, 3:42 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	63 min
Aug 4, 3:47 PM EDT	Small Craft Advisory	PHI		39 hr
Aug 4, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	59 min
Aug 4, 5:30 PM EDT	Small Craft Advisory	PHI		4 hr
Aug 4, 1:12 PM EDT	Special Weather Statement	PHI	Philadelphia	63 min
Aug 4, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	44 min
Aug 4, 2:51 PM EDT	Special Weather Statement	PHI	Northampton	54 min
Aug 4, 3:55 PM EDT	Special Weather Statement	PHI	Lebanon	65 min
Aug 4, 4:08 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	52 min
Aug 4, 4:49 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	56 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2012 Severe Thunderstorm Warnings in New Jersey, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.