Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 201, NWS Philadelphia/Mount Holly

August 17, 2007Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2007, 3:20 PM EDT for Somerset County, New Jersey. It was in force for 55 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 17, 2007, 3:20 PM EDT (19:20 UTC)
Expired: Aug 17, 2007, 4:15 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Somerset County, NJ

What was reported inside it

Time	Report	Where	Remark
Aug 17, 3:38 PM EDT	HAIL 1.75	2 Ne Belle Mead, NJ	GOLF BALL SIZE HAIL REPORTED IN HILLSBOROUGH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 17, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.3 hours before the alert went out and 159 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: 120 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1465 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 171920
SVRPHI
NJC035-172015-
/O.NEW.KPHI.SV.W.0201.070817T1920Z-070817T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
320 PM EDT FRI AUG 17 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 415 PM EDT

* AT 316 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  CLOVERHILL...OR ABOUT 18 MILES NORTH OF TRENTON...AND MOVING EAST
  AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BELLE MEAD...SKILLMAN AND 8 MILES SOUTH OF SOMERVILLE BY 325 PM
  EDT...
  ROCKY HILL...MILLSTONE...7 MILES SOUTH OF MANVILLE AND 9 MILES
  SOUTH OF BOUND BROOK BY 330 PM EDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

LAT...LON 4039 7460 4040 7474 4050 7480 4050 7477
      4054 7475 4056 7472 4057 7471 4059 7473
      4061 7451
TIME...MOT...LOC 1920Z 284DEG 39KT 4047 7473

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 10:32 PM EDT	Special Marine Warning	PHI		43 min
Aug 16, 11:12 PM EDT	Special Marine Warning	PHI		63 min
Aug 16, 11:27 PM EDT	Special Marine Warning	PHI		48 min
Aug 16, 11:36 PM EDT	Special Marine Warning	PHI		39 min
Aug 17, 12:29 AM EDT	Special Marine Warning	PHI		46 min
Aug 17, 2:20 PM EDT	Severe Thunderstorm Warning	PHI	Warren	70 min
Aug 17, 2:43 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	62 min
Aug 17, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	55 min
Aug 17, 3:17 PM EDT	Tornado Warning	PHI	Warren	43 min
Aug 17, 3:36 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	69 min
Aug 17, 3:46 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris	49 min
Aug 17, 3:59 PM EDT	Special Marine Warning	PHI		2 hr
Aug 17, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Camden	36 min
Aug 17, 4:11 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	49 min
Aug 17, 4:45 PM EDT	Severe Thunderstorm Warning	PHI	Warren	60 min
Aug 17, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	58 min
Aug 17, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	Morris	64 min
Aug 17, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	59 min
Aug 17, 6:27 PM EDT	Special Marine Warning	PHI		93 min
Aug 17, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	35 min
Aug 17, 7:47 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	58 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2007 Every severe thunderstorm warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.