Alert archive / New Jersey / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly

February 25, 2011Burlington County, Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2011, 1:04 PM EST for Burlington County, Camden County, Gloucester County, New Jersey; Delaware County, Philadelphia County, Pennsylvania. It was in force for 56 min. 3 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
Feb 25, 2011, 1:04 PM EST (18:04 UTC)
Expired
Feb 25, 2011, 2:00 PM EST
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 41 km from the middle of the area, began a volume at 18:05 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
Feb 25, 1:15 PM ESTTSTM WND DMGWoodbury, NJTREES DOWN.
Feb 25, 1:20 PM ESTTSTM WND DMGWestampton Twp, NJLARGE TREE KNOCKED DOWN
Feb 25, 1:56 PM ESTTSTM WND DMGAudubon, NJTREE FELL INTO A TRAFFIC LIGHT WHICH THEN TOOK DOWN POWER LINES.

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
Feb 25, 12:19 PM ESTSevere Thunderstorm WatchSPC3 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 202 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, Brookhaven, NY at 12:00Z on 2011-02-25Temperature 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, Brookhaven, NY at 12:00Z on 2011-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 464 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
446 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
464 m²/s²
0-3 km storm-relative helicity
723 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.

953 
WUUS51 KPHI 251804
SVRPHI
NJC005-007-015-PAC045-101-251900-
/O.NEW.KPHI.SV.W.0001.110225T1804Z-110225T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
104 PM EST FRI FEB 25 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  NORTHERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 200 PM EST

* AT 100 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM TACONY TO YEADON TO CHESTER...OR ALONG A LINE EXTENDING FROM
  PHILADELPHIA TO 7 MILES WEST OF CAMDEN TO 10 MILES NORTHEAST OF
  WILMINGTON...AND MOVING EAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF HEAVY SHOWERS AND THUNDERSTORMS MAY CONTAIN LITTLE OR 
NO LIGHTNING. DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK 
SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 4003 7489 4006 7457 3985 7445 3972 7459
      3973 7478 3978 7541 3992 7534 4003 7510
TIME...MOT...LOC 1802Z 270DEG 45KT 4006 7504 3992 7521
          3980 7535

$$

GORSE
1 follow-up statement
072 
WWUS51 KPHI 251825
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
125 PM EST FRI FEB 25 2011

PAC045-101-251833-
/O.CAN.KPHI.SV.W.0001.000000T0000Z-110225T1900Z/
DELAWARE PA-PHILADELPHIA PA-
125 PM EST FRI FEB 25 2011

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

THE LINE OF HEAVY SHOWERS AND THUNDERSTORMS HAS SHIFTED EAST OF THE 
AREA, THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

LAT...LON 3989 7513 4003 7489 4006 7457 3985 7445
      3972 7459 3973 7478 3978 7541
TIME...MOT...LOC 1823Z 270DEG 45KT 4006 7470 3992 7487
          3980 7501

$$

NJC005-007-015-251900-
/O.CON.KPHI.SV.W.0001.000000T0000Z-110225T1900Z/
CAMDEN NJ-GLOUCESTER NJ-BURLINGTON NJ-
125 PM EST FRI FEB 25 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EST
FOR CENTRAL BURLINGTON...NORTHWESTERN GLOUCESTER AND NORTHERN CAMDEN
COUNTIES...

AT 122 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM JOBSTOWN TO MOUNT LAUREL TO LAUREL SPRINGS...OR ALONG
A LINE EXTENDING FROM 12 MILES SOUTH OF TRENTON TO 12 MILES EAST OF
CAMDEN TO 11 MILES SOUTHEAST OF CAMDEN...MOVING EAST AT 50 MPH.

THE DAMAGING WINDS CAN OCCUR ANYWHERE ALONG THIS LINE AS IT RACES 
ACROSS THE AREA.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CLEMENTON...PINE HILL...PINE VALLEY...BERLIN...MEDFORD...MARLTON
LAKES...WRIGHTSTOWN...PEMBERTON...ATCO...MCGUIRE AFB...MEDFORD
LAKES...PEMBERTON HEIGHTS...FORT DIX...LEISURETOWNE...BROWNS MILLS...
TABERNACLE...ATSION...COUNTRY LAKE ESTATES...SHAMONG...PRESIDENTIAL
LAKES...WHARTON STATE FOREST AND CHATSWORTH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF HEAVY SHOWERS AND THUNDERSTORMS MAY CONTAIN LITTLE OR 
NO LIGHTNING. DO NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK 
SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM EST FRIDAY
AFTERNOON FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

&&

LAT...LON 3989 7513 4003 7489 4006 7457 3985 7445
      3972 7459 3973 7478 3978 7541
TIME...MOT...LOC 1823Z 270DEG 45KT 4006 7470 3992 7487
          3980 7501

$$

GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 25, 4:56 AM ESTFreezing Rain AdvisoryPHISussex5 hr
Feb 25, 7:53 AM ESTSpecial Weather StatementPHIAtlantic, Cape May, Cumberland82 min
Feb 25, 9:15 AM ESTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more90 min
Feb 25, 12:44 PM ESTSpecial Weather StatementPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Salem and 1 more61 min
Feb 25, 1:11 PM ESTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem64 min
Feb 25, 1:16 PM ESTSevere Thunderstorm WarningPHIBurlington, Mercer, Middlesex, Monmouth, Ocean59 min
Feb 25, 1:23 PM ESTSpecial Marine WarningPHI67 min
Feb 25, 1:25 PM ESTSpecial Marine WarningPHI65 min
Feb 25, 1:48 PM ESTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more57 min
Feb 25, 1:57 PM ESTSpecial Marine WarningPHI63 min
Feb 25, 2:09 PM ESTSevere Thunderstorm WarningPHIAtlantic, Cape May, Cumberland51 min
Feb 25, 2:16 PM ESTSpecial Marine WarningPHI89 min
Feb 25, 3:39 PM ESTSpecial Marine WarningPHI41 min
Feb 25, 12:11 PM ESTSpecial Weather StatementPHIBucks, Chester, Delaware, Montgomery, Philadelphia64 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.