Alert archive / New Jersey / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 40, NWS Philadelphia/Mount Holly

May 27, 2014New Castle County, Delaware; 6 counties in New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2014, 5:52 PM EDT for New Castle County, Delaware; 6 counties in New Jersey; 5 counties in Pennsylvania. It was in force for 53 min. 13 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
May 27, 2014, 5:52 PM EDT (21:52 UTC)
Expired
May 27, 2014, 6:45 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 42 km from the middle of the area, began a volume at 21:55 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
May 27, 6:00 PM EDTTSTM WND DMGRoxborough, PAA VERY LARGE LIMB DOWN...DAMAGING TWO PARKED CARS.
May 27, 6:00 PM EDTTSTM WND GST 50Maple Glen, PA
May 27, 6:02 PM EDTTSTM WND DMGFox Chase, PASOME TREES AND WIRES DOWN.
May 27, 6:05 PM EDTTSTM WND DMGN Philadelphia, PATREE KNOCKED OVER ONTO POWER LINES. POWER OUTAGES REPORTED.
May 27, 6:05 PM EDTTSTM WND DMGPhiladelphia, PASOME TREES DOWN ALONG ROOSEVELT BOULEVARD.
May 27, 6:08 PM EDTTSTM WND GST 49Northeast Philadelphia, PA
May 27, 6:13 PM EDTTSTM WND DMGChalfont, PATREE FELL ON POWER LINES
May 27, 6:15 PM EDTTSTM WND DMGDelran Twp, NJLARGE BRANCH DOWN.
May 27, 6:15 PM EDTTSTM WND DMGDelran Twp, NJSOME LARGE LIMBS DOWN.
May 27, 6:15 PM EDTTSTM WND DMGMoorestown, NJSOME TREES DOWN.
May 27, 6:25 PM EDTTSTM WND DMGSpringfield Twp, NJJCPL UTILITY REPORTS TREES DOWN ON POWER LINES.
May 27, 6:30 PM EDTTSTM WND DMGClarksburg, NJJCPL REPORTS TREES DOWN ON POWER LINES.
May 27, 6:38 PM EDTTSTM WND GST 49Wrightstown, NJ

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
May 27, 5:30 PM EDTSevere Thunderstorm WatchSPC3 hr
May 27, 2:13 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.9 hours before the alert went out and 124 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 2014-05-27Temperature 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°0°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 2014-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 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
1885 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
94 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.

352 
WUUS51 KPHI 272152
SVRPHI
DEC003-NJC005-007-015-021-025-029-PAC017-029-045-091-101-272245-
/O.NEW.KPHI.SV.W.0040.140527T2152Z-140527T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
552 PM EDT TUE MAY 27 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHEASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  EAST CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA...
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHWESTERN MONMOUTH COUNTY IN CENTRAL NEW JERSEY...
  NORTHWESTERN OCEAN COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 645 PM EDT

* AT 547 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  DUBLIN TO BLUE BELL TO ELAM...MOVING EAST AT 35 MPH. THESE STORMS
  ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WILLOW GROVE AND SWARTHMORE AROUND 600 PM EDT...
  NEW HOPE AND YEADON AROUND 605 PM EDT...
  FEASTERVILLE AND GIBBSTOWN AROUND 610 PM EDT...
  WASHINGTON CROSSING AND PALMYRA AROUND 615 PM EDT...
  PENNINGTON AND WOODSIDE AROUND 620 PM EDT...
  LAWRENCEVILLE AND WILLINGBORO AROUND 625 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

VERY HEAVY RAIN WILL ALSO OCCUR WITH THIS LINE OF SEVERE
THUNDERSTORMS...WHICH COULD FLOOD LOW LYING AREAS QUICKLY AND COVER
ROADS WITH WATER. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS LINE OF
SEVERE THUNDERSTORMS. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
TUESDAY EVENING FOR NORTHEASTERN MARYLAND AND EASTERN PENNSYLVANIA. A
SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT EDT
WEDNESDAY MORNING FOR DELAWARE AND SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

&&

LAT...LON 3996 7442 3969 7467 3973 7474 3961 7487
      3972 7537 3979 7541 3974 7548 3979 7570
      4015 7534 4045 7519 4040 7497 4034 7494
      4035 7486 4038 7486 4032 7461 4028 7449
      4025 7448 4028 7439 4025 7427
TIME...MOT...LOC 2152Z 285DEG 31KT 4034 7512 4013 7522
          3983 7551

$$

FORECASTER: HEAVENER
1 follow-up statement
123 
WWUS51 KPHI 272240
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
640 PM EDT TUE MAY 27 2014

DEC003-NJC005-007-015-021-025-029-PAC017-029-045-091-101-272250-
/O.EXP.KPHI.SV.W.0040.000000T0000Z-140527T2245Z/
CAMDEN NJ-MERCER NJ-BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-CHESTER PA-BURLINGTON NJ-
MONMOUTH NJ-OCEAN NJ-
640 PM EDT TUE MAY 27 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OCEAN...
SOUTHWESTERN MONMOUTH...BURLINGTON...EAST CENTRAL CHESTER...
NORTHEASTERN NEW CASTLE...GLOUCESTER...DELAWARE...PHILADELPHIA...
SOUTHEASTERN MONTGOMERY...BUCKS...MERCER AND CAMDEN COUNTIES WILL
EXPIRE AT 645 PM EDT...

LAT...LON 3996 7442 3969 7467 3973 7474 3961 7487
      3972 7537 3979 7541 3974 7548 3979 7570
      4015 7534 4045 7519 4040 7497 4034 7494
      4035 7486 4038 7486 4032 7461 4028 7449
      4025 7448 4028 7439 4025 7427
TIME...MOT...LOC 2240Z 285DEG 31KT 4023 7460 4002 7470
          3972 7499

$$

HEAVENER

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 5:56 PM EDTSevere Thunderstorm WarningPHINew Castle64 min
May 27, 6:19 PM EDTAreal Flood AdvisoryPHINew Castle3 hr
May 27, 6:49 PM EDTSpecial Weather StatementPHIKent56 min
May 27, 7:15 PM EDTSevere Thunderstorm WarningPHIKent, Sussex60 min
May 27, 7:55 PM EDTSevere Thunderstorm WarningPHISussex65 min
May 27, 4:08 AM EDTSmall Craft AdvisoryPHI59 hr
May 27, 6:28 PM EDTSpecial Marine WarningPHI62 min
May 27, 6:29 PM EDTSpecial Marine WarningPHI2 hr
May 27, 6:33 PM EDTSpecial Weather StatementPHIBurlington, Camden, Ocean57 min
May 27, 6:38 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Monmouth, Ocean52 min
May 27, 7:49 PM EDTSpecial Marine WarningPHI86 min
May 27, 7:53 PM EDTSpecial Marine WarningPHI82 min
May 27, 4:33 PM EDTSpecial Weather StatementPHIBerks57 min
May 27, 4:47 PM EDTSevere Thunderstorm WarningPHIBerks43 min
May 27, 5:08 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery67 min
May 27, 5:24 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery66 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2014Severe Thunderstorm Warnings in Pennsylvania, 2014Severe Thunderstorm Warnings in Delaware, 2014Every severe thunderstorm warning in 2014

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.