Alert archive / New Jersey / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 174, NWS Philadelphia/Mount Holly

November 17, 20104 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 17, 2010, 2:35 AM EST for 4 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 55 min. 5 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
Nov 17, 2010, 2:35 AM EST (07:35 UTC)
Expired
Nov 17, 2010, 3:30 AM EST
In force
55 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 07:35 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
Nov 17, 2:51 AM ESTTSTM WND DMG5 Se Woodstown, NJTREES AND WIRES DOWN ON ROADS IN UPPER PITTSGROVE TOWNSHIP PRETTY MUCH TOWNSHIP WIDE. LOCATION POSTED IS APPROXIMATE.
Nov 17, 3:00 AM ESTTSTM WND GST 56London Grove Twp, PAA 56 MPH THUNDERSTORM WIND GUST WAS RECORDED AT LONDON GROVE. TIME APPROXIMATE.
Nov 17, 3:05 AM ESTTSTM WND DMGConshohocken, PATREES AND WIRES DOWN BETWEEN NORSAM AND COUNTRY CLUB DRIVE.
Nov 17, 3:05 AM ESTTSTM WND DMGNarberth, PATREES AND WIRES DOWN BETWEEN GYSPY LANE AND MONTGOMERY AVE.
Nov 17, 3:15 AM ESTTSTM WND GST 41Philadelphia Intl Airpo, PAA 41 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE PHILADELPHIA INTERNATIONAL AIRPORT.

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
Nov 17, 12:06 AM ESTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.6 hours before the alert went out and 201 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, Washington/Dulle, VA at 00:00Z on 2010-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 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, Washington/Dulle, VA at 00:00Z on 2010-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 621 square meters per square second.1939587897117Sfc1 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
30 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
621 m²/s²
0-3 km storm-relative helicity
799 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.

164 
WUUS51 KPHI 170735
SVRPHI
NJC007-011-015-033-PAC029-045-091-101-170830-
/O.NEW.KPHI.SV.W.0174.101117T0735Z-101117T0830Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
235 AM EST WED NOV 17 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF WEST CHESTER...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  WESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...
  CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...VINELAND...MILLVILLE...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 330 AM EST

* AT 230 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM KENNETT SQUARE TO 9 MILES WEST
  OF HANCOCKS BRIDGE TO 14 MILES SOUTHWEST OF HANCOCKS BRIDGE TO 
  36 MILES SOUTHWEST OF GREENWICH...AND MOVING NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MARSHALLTON AND PENNSVILLE AROUND 240 AM EST...
  WESTTOWN...ELAM...CONCORDVILLE AND WEST CHESTER AROUND 245 AM
  EST...
  GRADYVILLE...CHEYNEY...CHELSEA AND HANCOCKS BRIDGE AROUND 250 AM
  EST...

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.

DAMAGING WINDS UP TO 65 MPH MPH WERE REPORTED IN BEAR DELAWARE
WITH THIS STORM. THIS IS A DANGEROUS STORM...SEEK SAFE SHELTER AND 
STAY AWAY FROM WINDOWS!

&&

LAT...LON 4024 7527 4001 7504 3999 7507 3997 7501
      3988 7496 3955 7494 3951 7499 3947 7493
      3941 7493 3923 7519 3946 7555 3957 7553
      3962 7558 3980 7542 3983 7549 3984 7563
      3979 7574 3973 7578 3990 7584
TIME...MOT...LOC 0734Z 227DEG 41KT 3990 7571 3954 7559
          3940 7562 3899 7567

$$

HAYES
2 follow-up statements
244 
WWUS51 KPHI 170802
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
302 AM EST WED NOV 17 2010

NJC007-011-015-033-PAC029-045-091-101-170830-
/O.CON.KPHI.SV.W.0174.000000T0000Z-101117T0830Z/
SALEM NJ-CUMBERLAND NJ-CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-
PHILADELPHIA PA-CHESTER PA-MONTGOMERY PA-
302 AM EST WED NOV 17 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 AM EST
FOR SOUTHEASTERN MONTGOMERY...EAST CENTRAL CHESTER...PHILADELPHIA...
DELAWARE...GLOUCESTER...WESTERN CAMDEN...CUMBERLAND AND SALEM
COUNTIES...

AT 258 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM 14 MILES NORTHEAST OF WEST 
CHESTER TO 8 MILES EAST OF DOVER...MOVING NORTHEAST AT 45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  NORTH WALES...ROXBOROUGH...CHESTNUT HILL AND DEPTFORD BY 310 AM
  EST...
  KENSINGTON...CENTER CITY...NEWPORT AND CEDARVILLE BY 315 AM EST...
  WISSINOMING AND FRANKLINVILLE BY 320 AM EST...

LAT...LON 3923 7519 3945 7548 3957 7553 3962 7558
      3980 7542 3983 7549 3984 7545 4005 7558
      4024 7528 4001 7504 3999 7507 3997 7502
      3992 7498 3981 7495 3955 7494 3951 7499
      3947 7493 3942 7493
TIME...MOT...LOC 0802Z 227DEG 41KT 4012 7535 3976 7523
          3962 7527 3921 7532

$$

HAYES
270 
WWUS51 KPHI 170832
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
332 AM EST WED NOV 17 2010

NJC007-011-015-033-PAC029-045-091-101-170842-
/O.EXP.KPHI.SV.W.0174.000000T0000Z-101117T0830Z/
SALEM NJ-CUMBERLAND NJ-CAMDEN NJ-GLOUCESTER NJ-DELAWARE PA-
PHILADELPHIA PA-CHESTER PA-MONTGOMERY PA-
332 AM EST WED NOV 17 2010

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MONTGOMERY...EAST
CENTRAL CHESTER...PHILADELPHIA...DELAWARE...GLOUCESTER...WESTERN
CAMDEN...CUMBERLAND AND SALEM COUNTIES HAS EXPIRED...

THE STORMS THAT PROMPTED THE WARNING HAVE MOVED EAST OF THE AREA. 

LAT...LON 3923 7519 3945 7548 3957 7553 3962 7558
      3980 7542 3983 7549 3984 7545 4005 7558
      4024 7528 4001 7504 3999 7507 3997 7502
      3992 7498 3981 7495 3955 7494 3951 7499
      3947 7493 3942 7493
TIME...MOT...LOC 0802Z 227DEG 41KT 4011 7533 3975 7522
          3961 7526 3920 7532

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 17, 12:05 AM ESTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Monmouth, Ocean55 min
Nov 17, 12:43 AM ESTSpecial Weather StatementPHIAtlantic, Cape May, Ocean62 min
Nov 17, 12:47 AM ESTSpecial Weather StatementPHIMorris58 min
Nov 17, 12:50 AM ESTSpecial Weather StatementPHIMiddlesex, Monmouth55 min
Nov 17, 1:59 AM ESTSpecial Weather StatementPHICumberland, Gloucester, Salem61 min
Nov 17, 2:17 AM ESTSpecial Weather StatementPHIMiddlesex58 min
Nov 17, 2:23 AM ESTSpecial Marine WarningPHI67 min
Nov 17, 2:40 AM ESTSevere Thunderstorm WarningPHIHunterdon, Warren65 min
Nov 17, 2:50 AM ESTSpecial Marine WarningPHI55 min
Nov 17, 2:55 AM ESTSpecial Marine WarningPHI65 min
Nov 17, 2:57 AM ESTSpecial Weather StatementPHICape May33 min
Nov 17, 3:13 AM ESTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Cumberland, Mercer, Middlesex and 2 more62 min
Nov 17, 3:28 AM ESTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more62 min
Nov 17, 3:34 AM ESTSpecial Marine WarningPHI56 min
Nov 17, 4:06 AM ESTSevere Thunderstorm WarningPHIMiddlesex, Monmouth, Ocean24 min
Nov 17, 4:22 AM ESTSpecial Marine WarningPHI53 min
Nov 17, 12:33 AM ESTSpecial Weather StatementPHICarbon57 min
Nov 17, 1:23 AM ESTSpecial Weather StatementPHIBerks, Carbon67 min
Nov 17, 1:44 AM ESTSpecial Weather StatementPHIChester61 min
Nov 17, 1:49 AM ESTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh56 min
Nov 17, 2:16 AM ESTSpecial Weather StatementPHIChester, Lehigh59 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2010Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

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.