Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 167, NWS Philadelphia/Mount Holly

October 11, 2010Delaware County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 11, 2010, 10:04 PM EDT for Delaware County, Philadelphia County, Pennsylvania; Burlington County, Camden County, New Jersey. It was in force for 56 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
Oct 11, 2010, 10:04 PM EDT (02:04 UTC)
Expired
Oct 11, 2010, 11:00 PM EDT
In force
56 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 02:06 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
Oct 11, 10:25 PM EDTTSTM WND DMGCamden, NJSCATTERED WIRES DOWN IN CAMDEN AND NORTHERN PORTION OF COUNTY.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.1 hours before the alert went out and 219 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 2010-10-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 551 joules per kilogram.LCLEL10008507005003002001001 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 2010-10-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.19395878Sfc1 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
551 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
2256 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

197 
WUUS51 KPHI 120204
SVRPHI
NJC005-007-PAC045-101-120300-
/O.NEW.KPHI.SV.W.0167.101012T0204Z-101012T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1004 PM EDT MON OCT 11 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF PHILADELPHIA...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF CAMDEN...

* UNTIL 1100 PM EDT

* AT 1002 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
  NETHER PROVIDENCE TOWNSHIP...OR 12 MILES EAST OF WEST CHESTER...AND
  MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  EAST LANSDOWNE...DREXEL HILL...FOLCROFT AND PHILADELPHIA
  INTERNATIONAL AIRPORT AROUND 1010 PM EDT...
  SOUTH PHILADELPHIA...YEADON AND ROXBOROUGH AROUND 1015 PM EDT...
  CENTER CITY AROUND 1020 PM EDT...
  CAMDEN AND GLOUCESTER CITY AROUND 1025 PM EDT...

LAT...LON 3981 7509 3984 7510 3988 7515 3985 7525
      3985 7531 3984 7538 4001 7538 4002 7532
      3998 7528 4002 7522 4003 7481 3978 7480
TIME...MOT...LOC 0204Z 273DEG 32KT 3992 7535

$$

HAYES
2 follow-up statements
621 
WWUS51 KPHI 120218
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1018 PM EDT MON OCT 11 2010

NJC005-007-PAC045-101-120300-
/O.CON.KPHI.SV.W.0167.000000T0000Z-101012T0300Z/
CAMDEN NJ-DELAWARE PA-PHILADELPHIA PA-BURLINGTON NJ-
1018 PM EDT MON OCT 11 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR WEST CENTRAL BURLINGTON...SOUTHERN PHILADELPHIA...EASTERN
DELAWARE AND NORTHWESTERN CAMDEN COUNTIES...

AT 1015 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SOUTH PHILADELPHIA...OR 6 MILES WEST OF CAMDEN...MOVING
EAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  AUDUBON PARK...OAKLYN...GLOUCESTER CITY AND WOODLYNNE BY 1025 PM
  EDT...
  HADDONFIELD...AUDUBON...HADDON HEIGHTS AND COLLINGSWOOD BY 1030 PM
  EDT...
  CHERRY HILL AND SPRINGDALE BY 1035 PM EDT...

LAT...LON 3981 7509 3983 7509 3988 7515 3988 7516
      3988 7518 3985 7532 4002 7532 3998 7528
      4002 7522 4003 7481 3978 7480
TIME...MOT...LOC 0218Z 273DEG 32KT 3990 7519

$$

HAYES
524 
WWUS51 KPHI 120257
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1057 PM EDT MON OCT 11 2010

NJC005-007-PAC045-101-120307-
/O.EXP.KPHI.SV.W.0167.000000T0000Z-101012T0300Z/
CAMDEN NJ-DELAWARE PA-PHILADELPHIA PA-BURLINGTON NJ-
1057 PM EDT MON OCT 11 2010

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BURLINGTON...
SOUTHERN PHILADELPHIA...EASTERN DELAWARE AND NORTHWESTERN CAMDEN
COUNTIES WILL EXPIRE AT 1100 PM EDT...

THE STORM HAS WEAKENED AND MOCED OUT OF THE AREA.

LAT...LON 3981 7509 3983 7509 3988 7515 3988 7516
      3988 7518 3985 7532 4002 7532 3998 7528
      4002 7522 4003 7481 3978 7480
TIME...MOT...LOC 0257Z 273DEG 32KT 3987 7474

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 11, 9:51 PM EDTSpecial Weather StatementPHIBerks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more114 min
Oct 11, 9:59 PM EDTSpecial Weather StatementPHIDelaware, Philadelphia61 min
Oct 11, 10:08 PM EDTSpecial Weather StatementPHIBucks, Montgomery67 min
Oct 11, 10:34 PM EDTSpecial Weather StatementPHIBucks, Montgomery56 min
Oct 12, 12:43 AM EDTSpecial Weather StatementPHIBerks62 min
Oct 12, 1:00 AM EDTSpecial Weather StatementPHIBerks60 min
Oct 12, 1:21 AM EDTSpecial Weather StatementPHIBucks54 min
Oct 12, 1:39 AM EDTSpecial Weather StatementPHIMontgomery66 min
Oct 11, 8:23 PM EDTSpecial Weather StatementPHIUnion67 min
Oct 11, 8:26 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth, Morris, Somerset45 min
Oct 11, 10:06 PM EDTSpecial Weather StatementPHIMiddlesex54 min
Oct 11, 10:27 PM EDTSpecial Weather StatementPHIHunterdon, Middlesex, Somerset63 min
Oct 11, 10:44 PM EDTSpecial Weather StatementPHIBurlington, Ocean61 min
Oct 11, 11:10 PM EDTSpecial Weather StatementPHICumberland, Salem65 min
Oct 11, 11:25 PM EDTSpecial Weather StatementPHIBurlington, Ocean65 min
Oct 11, 11:29 PM EDTSpecial Weather StatementPHIMercer, Monmouth61 min
Oct 11, 11:37 PM EDTSpecial Marine WarningPHI53 min
Oct 11, 11:38 PM EDTSpecial Weather StatementPHICumberland67 min
Oct 11, 11:50 PM EDTSpecial Weather StatementPHICape May55 min
Oct 11, 11:57 PM EDTSpecial Weather StatementPHIMonmouth33 min
Oct 12, 12:20 AM EDTSpecial Weather StatementPHICape May55 min
Oct 12, 12:22 AM EDTSpecial Marine WarningPHI53 min
Oct 12, 12:23 AM EDTSpecial Weather StatementPHIOcean37 min
Oct 12, 12:25 AM EDTSpecial Weather StatementPHICape May65 min
Oct 12, 12:58 AM EDTSpecial Weather StatementPHIAtlantic62 min
Oct 12, 1:26 AM EDTSpecial Weather StatementPHIOcean64 min
Oct 12, 3:37 AM EDTSpecial Weather StatementPHIBurlington, Camden53 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010Severe Thunderstorm Warnings in New Jersey, 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.