Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 227, NWS Philadelphia/Mount Holly

August 1, 2011Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 1, 2011, 5:50 PM EDT for Camden County, Gloucester County, Salem County, New Jersey; Philadelphia County, Pennsylvania. It was in force for 70 min. 6 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 1, 2011, 5:50 PM EDT (21:50 UTC)
Expired
Aug 1, 2011, 7:00 PM EDT
In force
70 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 21:51 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 1, 5:56 PM EDTTSTM WND GST 60Philadelphia Intl Airpo, PA60 MPH GUST MEASURED AT THE PHILADELPHIA INTERNATIONAL AIRPORT.
Aug 1, 5:56 PM EDTHAIL 1Philadelphia Intl Airpo, PAQUARTER SIZE HAIL REPORTED AT THE PHILADELPHIA INTERNATIONAL AIRPORT.
Aug 1, 6:30 PM EDTTSTM WND GST 65Mullica Hill, NJ65 MPH WIND GUST ESTIMATED IN MULLICA HILL.
Aug 1, 6:30 PM EDTHAIL 1Mullica Hill, NJQUARTER SIZE HAIL REPORTED IN MULLICA HILL.
Aug 1, 6:55 PM EDTTSTM WND GST 50Malaga, NJ50 MPH WIND MEASURED IN MALAGA.
Aug 1, 6:58 PM EDTTSTM WND GST 60Glassboro, NJ55-60 MPH WIND REPORTED IN GLASSBORO.

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, 9.8 hours before the alert went out and 83 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 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 307 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, Phillips Aaf/Abe, MD at 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -192 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
307 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
1512 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-192 m²/s²
0-3 km storm-relative helicity
-166 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.5

Open this sounding in Storm Lab

The text

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

407 
WUUS51 KPHI 012150
SVRPHI
NJC007-015-033-PAC101-012300-
/O.NEW.KPHI.SV.W.0227.110801T2150Z-110801T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
550 PM EDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  WEST CENTRAL CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHEASTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 700 PM EDT

* AT 547 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
  PHILADELPHIA INTERNATIONAL AIRPORT...OR 9 MILES SOUTHWEST OF
  CAMDEN...AND MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PAULSBORO...GIBBSTOWN AND NATIONAL PARK AROUND 600 PM EDT...
  WEST DEPTFORD AROUND 605 PM EDT...
  DEPTFORD AND WOODBURY AROUND 610 PM EDT...
  WOODBURY HEIGHTS AROUND 615 PM EDT...
  MULLICA HILL AROUND 625 PM EDT...
  PITMAN AND TURNERSVILLE AROUND 635 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 3959 7494 3953 7516 3978 7542 3980 7542
      3985 7534 3985 7525 3987 7525 3989 7527
      3995 7515
TIME...MOT...LOC 2150Z 326DEG 13KT 3987 7526

$$

TFG
1 follow-up statement
001 
WWUS51 KPHI 012234
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
634 PM EDT MON AUG 1 2011

PAC101-012244-
/O.CAN.KPHI.SV.W.0227.000000T0000Z-110801T2300Z/
PHILADELPHIA PA-
634 PM EDT MON AUG 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PHILADELPHIA
COUNTY IS CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED INTO NEW JERSEY.

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 3985 7523 3987 7519 3987 7511 3959 7494
      3954 7516 3978 7542 3980 7542 3985 7534
      3985 7525
TIME...MOT...LOC 2234Z 326DEG 13KT 3976 7516

$$

NJC007-015-033-012300-
/O.CON.KPHI.SV.W.0227.000000T0000Z-110801T2300Z/
SALEM NJ-CAMDEN NJ-GLOUCESTER NJ-
634 PM EDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR GLOUCESTER...WEST CENTRAL CAMDEN AND NORTHEASTERN SALEM
COUNTIES...

AT 629 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
LOCATED NEAR WENONAH...OR 12 MILES SOUTH OF CAMDEN...MOVING SOUTHEAST
AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PITMAN AND TURNERSVILLE BY 645 PM EDT...
  GLASSBORO BY 650 PM EDT...
  CLAYTON...FRANKLINVILLE...7 MILES NORTHEAST OF ELMER AND 8 MILES
  NORTH OF MALAGA BY 700 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A VERY 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 3985 7523 3987 7519 3987 7511 3959 7494
      3954 7516 3978 7542 3980 7542 3985 7534
      3985 7525
TIME...MOT...LOC 2234Z 326DEG 13KT 3976 7516

$$

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 10:13 PM EDTSpecial Weather StatementPHIHunterdon, Middlesex, Somerset62 min
Jul 31, 10:58 PM EDTSpecial Weather StatementPHIMorris62 min
Aug 1, 1:49 AM EDTSpecial Marine WarningPHI56 min
Aug 1, 1:50 AM EDTSpecial Weather StatementPHIMonmouth55 min
Aug 1, 1:35 PM EDTSpecial Weather StatementPHIMorris, Sussex, Warren3 hr
Aug 1, 2:11 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Gloucester, Ocean94 min
Aug 1, 2:44 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem29 min
Aug 1, 4:09 PM EDTSpecial Weather StatementPHICamden66 min
Aug 1, 5:06 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester69 min
Aug 1, 6:03 PM EDTSpecial Marine WarningPHI57 min
Aug 1, 6:16 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester59 min
Aug 1, 6:17 PM EDTAreal Flood AdvisoryPHICamden, Gloucester3 hr
Aug 1, 6:20 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem46 min
Aug 1, 6:47 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland, Gloucester, Salem73 min
Aug 1, 7:01 PM EDTAreal Flood AdvisoryPHIAtlantic, Cumberland, Gloucester, Salem119 min
Aug 1, 7:07 PM EDTSpecial Marine WarningPHI83 min
Aug 1, 7:12 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland59 min
Aug 1, 7:17 PM EDTSpecial Marine WarningPHI118 min
Jul 31, 10:00 PM EDTSpecial Weather StatementPHIChester60 min
Aug 1, 3:14 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe51 min
Aug 1, 3:46 PM EDTSpecial Weather StatementPHIBerks89 min
Aug 1, 4:00 PM EDTSevere Thunderstorm WarningPHIBerks75 min
Aug 1, 4:33 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery, Philadelphia87 min
Aug 1, 4:39 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh42 min
Aug 1, 5:11 PM EDTAreal Flood AdvisoryPHIChester, Delaware, Montgomery, Philadelphia2 hr
Aug 1, 5:37 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Philadelphia53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2011Severe Thunderstorm Warnings in Pennsylvania, 2011Every severe thunderstorm warning in 2011

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.