Alert archive / New Jersey / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 85, NWS Philadelphia/Mount Holly

May 31, 2002Hunterdon County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 31, 2002, 8:30 PM EDT for Hunterdon County, Somerset County, New Jersey. It was in force for 45 min. 5 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: May 31, 2002, 8:30 PM EDT (00:30 UTC)
Expired: May 31, 2002, 9:15 PM EDT
In force: 45 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Hunterdon County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 00:34 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
May 31, 8:34 PM EDT	Thunderstorm Wind 50 E	Peapack, NJ
May 31, 8:38 PM EDT	Hail 0.75	Whitehouse, NJ
May 31, 8:40 PM EDT	Thunderstorm Wind 50 E	Central Portion, NJ
May 31, 9:05 PM EDT	Hail 0.75	Woods Tavern, NJ
May 31, 9:10 PM EDT	Thunderstorm Wind 50 E	Harlingen, 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
May 31, 5:15 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.5 hours before the alert went out and 164 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: 817 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 010030
SVRPHI
NJC019-035-010115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
830 PM EDT FRI MAY 31 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN SOMERSET COUNTY IN NORTHERN NEW JERSEY.
  NORTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY.

* UNTIL 915 PM EDT.

* AT 828 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... 2 MILES NORTH OF WHITE HOUSE STATION...
  MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FAR HILLS AT 835 PM.
  BOUND BROOK...SOMERVILLE...MANVILLE AT 840 PM.

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

$$

LAT...LON 4074 7485 4062 7503 4050 7458 4065 7444

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:01 PM EDT	Severe Thunderstorm Warning	PHI	Morris	44 min
May 31, 8:58 PM EDT	Tornado Warning	PHI	Somerset	32 min
May 31, 9:06 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex	54 min
May 31, 9:23 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
May 31, 9:41 PM EDT	Special Marine Warning	PHI		49 min
May 31, 10:44 PM EDT	Special Marine Warning	PHI		76 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.