Alert archive / New Jersey / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 134, NWS Philadelphia/Mount Holly

June 27, 2002Mercer County, Middlesex County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 27, 2002, 7:44 PM EDT for Mercer County, Middlesex County, Somerset County, New Jersey. It was in force for 46 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 27, 2002, 7:44 PM EDT (23:44 UTC)
Expired: Jun 27, 2002, 8:30 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 23:47 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

Time	Report	Where	Remark
Jun 27, 7:57 PM EDT	Thunderstorm Wind 52 E	Neshanic, NJ
Jun 27, 8:00 PM EDT	Thunderstorm Wind 52 E	Countywide, NJ

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jun 27, 2:00 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.7 hours before the alert went out and 152 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: 1079 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 922 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.4
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 272344
SVRPHI
NJC021-023-035-280030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
743 PM EDT THU JUN 27 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 830 PM EDT.

* AT 742 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  SEVERE THUNDERSTORMS...ALONG A LINE EXTENDING FROM 2 MILES EAST OF
  FAR HILLS TO 7 MILES NORTHWEST OF PENNINGTON...MOVING SOUTHEAST AT
  40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SOMERVILLE...MANVILLE AT 750 PM.
  ROCKY HILL...PENNINGTON...MILLSTONE...MIDDLESEX AT 755 PM.
  SOMERSET...SOCIETY HILL...PRINCETON...LAWRENCEVILLE AT 800 PM.

HAIL UP TO ONE INCH IN DIAMETER AND WINDS GREATER THAN 55 MILES AN
HOUR ARE EXPECTED FROM THIS STORM. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED.

FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.

$$

LAT...LON 4033 7484 4019 7468 4043 7429 4070 7464
          4041 7473

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	37 min
Jun 27, 5:05 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Somerset	40 min
Jun 27, 5:18 PM EDT	Tornado Warning	PHI	Hunterdon, Somerset	27 min
Jun 27, 5:44 PM EDT	Tornado Warning	PHI	Middlesex, Somerset	36 min
Jun 27, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	47 min
Jun 27, 7:37 PM EDT	Special Marine Warning	PHI		113 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2002 Every severe thunderstorm warning in 2002

Sources

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