Alert archive / New Jersey / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 137, NWS Philadelphia/Mount Holly

July 14, 2004Burlington County, New Jersey; Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 14, 2004, 5:41 PM EDT for Burlington County, New Jersey; Philadelphia County, Pennsylvania. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 14, 2004, 5:41 PM EDT (21:41 UTC)
Expired
Jul 14, 2004, 6:45 PM EDT
In force
64 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Burlington County, NJ, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 21:42 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.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.7 hours before the alert went out and 121 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 2004-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Phillips Aaf/Abe, MD at 12:00Z on 2004-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 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
3 J/kg
Mixed-layer CIN
-233 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
125 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 142141
SVRPHI
NJC005-PAC101-142245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
540 PM EDT WED JUL 14 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA
  BURLINGTON COUNTY IN SOUTHERN NEW JERSEY

* UNTIL 645 PM EDT

* AT 538 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER
  LOWER MONTGOMERY COUNTY IN PENNSYLVANIA...AND MOVING SOUTHEAST AT 
  30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BEVERLY AND RIVERSIDE BY 555 PM EDT...
  WILLINGBORO BY 600 PM EDT...
  MOUNT HOLLY BY 610 PM EDT...
  PEMBERTON AND MEDFORD BY 615 PM EDT...
  LEISURETOWNE BY 620 PM EDT...
  PRESIDENTIAL LAKES BY 630 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4011 7497 4003 7498 4005 7496 4011 7479
      3999 7452 3976 7439 3966 7446 3966 7446
      4002 7508 4005 7512 4009 7509 4006 7515
      4013 7501

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 14, 2:22 PM EDTSevere Thunderstorm WarningPHIHunterdon53 min
Jul 14, 3:20 PM EDTSevere Thunderstorm WarningPHIHunterdon, Somerset55 min
Jul 14, 3:40 PM EDTFlash Flood WarningPHIHunterdon, Monmouth77 days
Jul 14, 4:15 PM EDTSevere Thunderstorm WarningPHISalem60 min
Jul 14, 4:19 PM EDTSevere Thunderstorm WarningPHISomerset56 min
Jul 14, 5:04 PM EDTSevere Thunderstorm WarningPHICumberland, Salem56 min
Jul 14, 5:10 PM EDTTornado WarningPHICumberland, Salem35 min
Jul 14, 5:17 PM EDTFlash Flood WarningPHISalem3 hr
Jul 14, 5:53 PM EDTSevere Thunderstorm WarningPHIMercer52 min
Jul 14, 5:55 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland65 min
Jul 14, 7:07 PM EDTSevere Thunderstorm WarningPHICape May53 min
Jul 14, 3:05 PM EDTFlash Flood WarningPHIChester, Delaware, Philadelphia76 days
Jul 14, 3:12 PM EDTSevere Thunderstorm WarningPHIBerks63 min
Jul 14, 4:10 PM EDTSevere Thunderstorm WarningPHIBerks65 min
Jul 14, 4:24 PM EDTSevere Thunderstorm WarningPHIChester66 min
Jul 14, 4:44 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery61 min
Jul 14, 5:01 PM EDTTornado WarningPHIMontgomery29 min
Jul 14, 5:17 PM EDTSpecial Marine WarningPHI103 min
Jul 14, 5:44 PM EDTSevere Thunderstorm WarningPHIBucks61 min
Jul 14, 5:51 PM EDTFlash Flood WarningPHIBucks2 hr
Jul 14, 6:01 PM EDTSpecial Marine WarningPHI74 min
Jul 14, 6:39 PM EDTSpecial Marine WarningPHI66 min
Jul 14, 6:39 PM EDTSpecial Marine WarningPHI66 min
Jul 14, 6:46 PM EDTFlash Flood WarningPHIBerks3 hr
Jul 14, 7:00 PM EDTSpecial Marine WarningPHI60 min
Jul 14, 7:38 PM EDTSpecial Marine WarningPHI82 min
Jul 14, 7:38 PM EDTSpecial Marine WarningPHI82 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2004Severe Thunderstorm Warnings in Pennsylvania, 2004Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.