Alert archive / New Jersey / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 6, NWS Philadelphia/Mount Holly

April 9, 2001Morris County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2001, 6:38 PM EDT for Morris County, Sussex County, New Jersey. It was in force for 52 min. 3 reports came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Apr 9, 2001, 6:38 PM EDT (22:38 UTC)
Expired: Apr 9, 2001, 7:30 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Morris County, NJ, Sussex County, NJ

What was reported inside it

Time	Report	Where
Apr 9, 6:45 PM EDT	Hail 0.75	Lake Mohawk, NJ
Apr 9, 7:00 PM EDT	Thunderstorm Wind 50 E	Woodstock, NJ
Apr 9, 7:10 PM EDT	Hail 0.75	Sparta, 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.6 hours before the alert went out and 150 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1385 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 138 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 092239
SVRPHL
NJC027-037-092330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
638 PM EDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MORRIS COUNTY IN NORTHERN NEW JERSEY.
  SOUTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY.

* UNTIL 730 PM EDT.

* AT 636 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... 4 MILES NORTHWEST OF NEWTON...MOVING EAST AT
  35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LAKE MOHAWK AT 650 PM.
  FRANKLIN AT 655 PM.
  KINNELON AT 710 PM.
  PEQUANNOCK TOWNSHIP AT 720 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 4112 7489 4104 7486 4092 7428 4112 7424

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	34 min
Apr 9, 7:30 PM EDT	Severe Thunderstorm Warning	PHI	Morris	30 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2001 Every severe thunderstorm warning in 2001

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.