Alert archive / New Jersey / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 175, NWS Philadelphia/Mount Holly

August 11, 2004Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 11, 2004, 6:19 PM EDT for Mercer County, New Jersey. It was in force for 41 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: Aug 11, 2004, 6:19 PM EDT (22:19 UTC)
Expired: Aug 11, 2004, 7:00 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 42 km from the middle of the area, began a volume at 22:22 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 11, 12:55 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.3 hours before the alert went out and 167 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1077 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 112219
SVRPHI
NJC021-112300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
617 PM EDT WED AUG 11 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY.

* UNTIL 700 PM EDT

* AT 614 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS TO 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  SOUTHWEST OF WHITE HORSE...OR ABOUT 8 MILES SOUTH OF TRENTON...AND
  MOVING NORTH AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WHITE HORSE BY 625 PM EDT...
  TRENTON BY 630 PM EDT...
  MERCERVILLE-HAMILTON SQUARE AND EWING BY 635 PM EDT...
  LAWRENCEVILLE BY 640 PM EDT...
  PRINCETON BY 650 PM EDT...

HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED WITH THIS STORM
IN BOTH PHILADELPHIA AND BUCKS COUNTIES. IF YOU ARE IN THE PATH OF
THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

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.


LAT...LON 4037 7473 4038 7463 4034 7465 4029 7454
      4018 7460 4017 7462 4014 7462 4017 7468
      4016 7472 4024 7483 4042 7476

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 12:46 PM EDT	Severe Thunderstorm Warning	PHI	Morris	59 min
Aug 11, 1:00 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	60 min
Aug 11, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Morris	46 min
Aug 11, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	28 min
Aug 11, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	78 min
Aug 11, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	23 min
Aug 11, 5:37 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	53 min
Aug 11, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	67 min
Aug 11, 6:32 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	73 min
Aug 11, 6:47 PM EDT	Flash Flood Warning	PHI	Middlesex	118 min
Aug 11, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	32 min
Aug 11, 7:45 PM EDT	Flash Flood Warning	PHI	Monmouth	2 hr
Aug 11, 7:58 PM EDT	Flash Flood Warning	PHI	Mercer	2 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2004 Every 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.