Alert archive / New Jersey / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 61, NWS Philadelphia/Mount Holly

June 30, 2001Morris County, Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 30, 2001, 10:31 PM EDT for Morris County, Sussex County, New Jersey. It was in force for 44 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 30, 2001, 10:31 PM EDT (02:31 UTC)
Expired: Jun 30, 2001, 11:15 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Morris County, NJ, Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 02:32 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 30, 10:40 PM EDT	Thunderstorm Wind 50 E	Tranquility, NJ
Jun 30, 11:00 PM EDT	Thunderstorm Wind 50 E	Boonton, 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 00:00Z, 2.5 hours before the alert went out and 148 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: 1564 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1439 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

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

937 
WUUS51 KPHI 010235 CCA
SVRPHI
NJC027-037-010315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTION
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1031 PM EDT SAT JUN 30 2001

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1115 PM EDT.

* AT 1022 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... 5 MILES WEST OF ANDOVER...MOVING EAST AT 30
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FRANKLIN...SUSSEX AT 1040 PM.
  LAKE TELEMARK AT 1045 PM.
  KINNELON AT 1050 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. A SKYWARN SPOTTER JUST REPORTED WIND 
GUSTS TO 50 MPH NEAR THE SUSSEX WARREN COUNTY BORDER.

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

$$

LAT...LON 4104 7492 4092 7477 4094 7449 4098 7432
          4125 7461

CORRECTED TO CHANGE NORTHEASTERN MORRIS TO NORTHERN MORRIS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 11:50 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	25 min
Jun 30, 11:56 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	34 min
Jul 1, 2:44 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	61 min
Jul 1, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	44 min
Jul 1, 3:45 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	45 min
Jul 1, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	39 min
Jul 1, 4:23 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris	52 min
Jul 1, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	46 min
Jul 1, 5:15 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex	45 min
Jul 1, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	49 min
Jul 1, 5:39 PM EDT	Tornado Warning	PHI	Monmouth	36 min
Jul 1, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	46 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; radar from the NEXRAD Level II archive.