Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 41, NWS Philadelphia/Mount Holly

June 2, 2009Delaware County, Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 2, 2009, 2:53 PM EDT for Delaware County, Pennsylvania; 4 counties in New Jersey; New Castle County, Delaware. It was in force for 67 min. 4 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
Jun 2, 2009, 2:53 PM EDT (18:53 UTC)
Expired
Jun 2, 2009, 4:00 PM EDT
In force
67 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 58 km from the middle of the area, began a volume at 18:54 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 2, 3:38 PM EDTTSTM WND GST 76Wilmington, DEA 76 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE NEW CASTLE COUNTY AIRPORT IN WILMINGTON. THE WIND WAS SUSTAINED AT 52 MPH.
Jun 2, 3:38 PM EDTTSTM WND GST 76Wilmington Manor, DEA 76 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE NEW CASTLE COUNTY AIRPORT IN WILMINGTON. THE WIND WAS SUSTAINED AT 52 MPH.
Jun 2, 3:42 PM EDTHAIL 0.75Wilmington, DEPENNY SIZE HAIL REPORTED ON ROUTES 131 AND 142.
Jun 2, 3:45 PM EDTTSTM WND GST 605 Ne Pennsville, NJA 60 MPH THUNDERSTORM WIND GUST WAS REPORTED NEAR THE DELAWARE MEMORIAL BRIDGE. PEA SIZE HAIL ALSO REPORTED.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 2, 1:58 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.9 hours before the alert went out and 98 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 2009-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2009-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1348 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 021853
SVRPHI
DEC003-NJC007-011-015-033-PAC045-022000-
/O.NEW.KPHI.SV.W.0041.090602T1853Z-090602T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
253 PM EDT TUE JUN 2 2009

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 CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTH CENTRAL CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 400 PM EDT

* AT 254 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  BECKETT...OR 6 MILES NORTHEAST OF WILMINGTON...AND MOVING EAST AT
  25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CARNEYS POINT...CHESTER...GIBBSTOWN...WOODSTOWN...MULLICA HILL...
  ELMER...GLASSBORO...TURNERSVILLE...CLAYTON...BERLIN...
  WILLIAMSTOWN...NEWFIELD...VICTORY LAKES AND CHESILHURST

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3964 7484 3951 7499 3947 7493 3945 7494
      3974 7562 3991 7554 3979 7491 3977 7489
      3978 7484 3977 7480 3975 7478
TIME...MOT...LOC 1853Z 289DEG 22KT 3979 7544

$$

JJM/MPD
1 follow-up statement
000 
WWUS51 KPHI 021931
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
331 PM EDT TUE JUN 2 2009

DEC003-NJC007-011-015-033-PAC045-022000-
/O.CON.KPHI.SV.W.0041.000000T0000Z-090602T2000Z/
SALEM NJ-CUMBERLAND NJ-CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-
NEW CASTLE DE-
331 PM EDT TUE JUN 2 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHEASTERN NEW CASTLE...SOUTHERN DELAWARE...GLOUCESTER...
SOUTHERN CAMDEN...NORTH CENTRAL CUMBERLAND AND NORTHERN SALEM
COUNTIES...

AT 328 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
CLUSTER OF THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE HAIL...AND 
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STORMS WERE AROUND 
SWEDESBORO...OR ABOUT 15 MILES EAST OF WILMINGTON...MOVING EAST AT 
25 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MULLICA
HILL...OAK VALLEY...WOODBURY HEIGHTS...WENONAH...PITMAN...ELMER...
GLASSBORO...BLACKWOOD...TURNERSVILLE...CLAYTON...CLEMENTON...
WILLIAMSTOWN...VICTORY LAKES...PINE VALLEY...PINE HILL...NEWFIELD...
CHESILHURST AND BERLIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
TUESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3964 7484 3951 7499 3947 7493 3945 7494
      3974 7562 3991 7554 3979 7491 3977 7489
      3978 7484 3977 7480 3975 7478
TIME...MOT...LOC 1930Z 289DEG 22KT 3975 7526

$$

MPD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 2, 3:15 PM EDTSevere Thunderstorm WarningPHIChester38 min
Jun 2, 3:38 PM EDTSevere Thunderstorm WarningPHICumberland, Salem67 min
Jun 2, 4:22 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Ocean53 min
Jun 2, 4:30 PM EDTSpecial Marine WarningPHI60 min
Jun 2, 4:39 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland51 min
Jun 2, 4:40 PM EDTSpecial Marine WarningPHI95 min
Jun 2, 5:03 PM EDTSpecial Marine WarningPHI54 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2009Severe Thunderstorm Warnings in Pennsylvania, 2009Severe Thunderstorm Warnings in Delaware, 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.