Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 80, NWS Philadelphia/Mount Holly

June 15, 2009Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 15, 2009, 6:37 PM EDT for Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania. It was in force for 53 min. 1 report 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
Jun 15, 2009, 6:37 PM EDT (22:37 UTC)
Expired
Jun 15, 2009, 7:30 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 22:38 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.

What was reported inside it

TimeReportWhereRemark
Jun 15, 6:50 PM EDTTSTM WND DMGWoodbury, NJTREE LIMBS DOWN.

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, 10.6 hours before the alert went out and 88 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 2009-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 196 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 2009-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.19395878Sfc1 km3 km6 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
196 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
943 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 152237
SVRPHI
NJC007-015-PAC045-101-152330-
/O.NEW.KPHI.SV.W.0080.090615T2237Z-090615T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
637 PM EDT MON JUN 15 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHWESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  WEST CENTRAL CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  CENTRAL GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 730 PM EDT

* AT 635 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND    
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR          
  GLOUCESTER CITY...OR NEAR CAMDEN...AND MOVING SOUTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOODBURY AROUND 645 PM EDT...
  WOODBURY AROUND 650 PM EDT...
  7 MILES NORTHEAST OF MULLICA HILL AROUND 700 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3972 7505 3967 7528 3986 7529 3990 7511
TIME...MOT...LOC 2236Z 332DEG 17KT 3989 7517

$$

GORSE/DEFINO
1 follow-up statement
000 
WWUS51 KPHI 152313
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
713 PM EDT MON JUN 15 2009

PAC045-101-152321-
/O.CAN.KPHI.SV.W.0080.000000T0000Z-090615T2330Z/
DELAWARE PA-PHILADELPHIA PA-
713 PM EDT MON JUN 15 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PHILADELPHIA AND
EXTREME SOUTHEASTERN DELAWARE COUNTIES IS CANCELLED...

THE SEVERE THUNDERSTORM HAS EXITED THE AREA, THEREFORE THE WARNING 
HAS BEEN CANCELLED. HOWEVER, A SMALL CLUSTER OF SHOWERS AND STORMS 
WILL AFFECTS PARTS OF THE AREA AND A SPECIAL WEATHER STATEMENT HAS 
BEEN ISSUED.

LAT...LON 3981 7511 3972 7505 3967 7528 3981 7529
TIME...MOT...LOC 2311Z 336DEG 17KT 3975 7514

$$

NJC007-015-152330-
/O.CON.KPHI.SV.W.0080.000000T0000Z-090615T2330Z/
CAMDEN NJ-GLOUCESTER NJ-
713 PM EDT MON JUN 15 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR CENTRAL GLOUCESTER AND WEST CENTRAL CAMDEN COUNTIES...

AT 711 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE 
HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR 
PITMAN...OR 13 MILES SOUTH OF CAMDEN...MOVING SOUTHEAST AT 20 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

THIS STORM HAS HAD A HISTORY OF PRODUCING LARGE HAIL AND GUSTY WINDS 
ACROSS EASTERN PENNSYLVANIA. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS

&&

LAT...LON 3981 7511 3972 7505 3967 7528 3981 7529
TIME...MOT...LOC 2311Z 336DEG 17KT 3975 7514

$$

GORSE/DEFINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 15, 7:05 PM EDTSevere Thunderstorm WarningPHISussex, Warren55 min
Jun 15, 7:48 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Somerset, Sussex, Warren28 min
Jun 15, 2:33 PM EDTSevere Thunderstorm WarningPHICarbon57 min
Jun 15, 3:16 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Northampton59 min
Jun 15, 4:15 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery60 min
Jun 15, 5:13 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery62 min
Jun 15, 5:55 PM EDTSevere Thunderstorm WarningPHIDelaware, Montgomery, Philadelphia65 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009

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.