Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 198, NWS Philadelphia/Mount Holly

August 17, 2007Hunterdon County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 17, 2007, 2:43 PM EDT for Hunterdon County, New Jersey; Bucks County, Pennsylvania. It was in force for 62 min. 5 reports 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, 2:43 PM EDT (18:43 UTC)
Expired: Aug 17, 2007, 3:45 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Hunterdon County, NJ, Bucks County, PA

What was reported inside it

Time	Report	Where	Remark
Aug 17, 3:00 PM EDT	HAIL 1	Ferndale, PA	HAIL FROM NICKEL TO QUARTER SIZE REPORTED IN FERNDALE. TREE LIMBS ALSO DOWN.
Aug 17, 3:15 PM EDT	HAIL 0.75	Clinton, NJ	PENNY SIZE HAIL REPORTED IN CLINTON.
Aug 17, 3:15 PM EDT	HAIL 0.75	Flemington, NJ	PENNY SIZE HAIL REPORTED IN FLEMINGTON.
Aug 17, 3:15 PM EDT	HAIL 1	1 N Flemington, NJ	HAIL UP TO THE SIZE OF QUARTERS WAS REPORTED IN RARITAN TOWNSHIP.
Aug 17, 3:15 PM EDT	HAIL 1.75	Frenchtown, NJ	HAIL TO THE SIZE OF GOLF BALLS WAS REPORTED IN FRENCHTOWN.

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, 6.7 hours before the alert went out and 188 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 171842
SVRPHI
NJC019-PAC017-171945-
/O.NEW.KPHI.SV.W.0198.070817T1843Z-070817T1945Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  NORTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 345 PM EDT

* AT 236 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  PLEASANT VALLEY...OR ABOUT 12 MILES SOUTHEAST OF BETHLEHEM...AND
  MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TINICUM BY 250 PM EDT...
  ERWINNA...FRENCHTOWN AND MILFORD BY 255 PM EDT...
  SERGEANTSVILLE BY 305 PM EDT...
  SAND BROOK AND 8 MILES SOUTH OF CLINTON BY 310 PM EDT...
  FLEMINGTON AND 9 MILES SOUTH OF ANNANDALE BY 315 PM EDT...
  9 MILES SOUTH OF LEBANON BY 320 PM EDT...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

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 7530 4056 7532 4058 7527 4059 7519
      4058 7519 4060 7517 4067 7479 4050 7477
      4050 7479 4049 7480 4043 7476
TIME...MOT...LOC 1843Z 264DEG 27KT 4049 7518

$$

RNS

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, 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, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	55 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
Aug 17, 1:48 PM EDT	Severe Thunderstorm Warning	PHI	Chester	72 min
Aug 17, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	68 min
Aug 17, 2:14 PM EDT	Tornado Warning	PHI	Chester	46 min
Aug 17, 2:19 PM EDT	Tornado Warning	PHI	Carbon	26 min
Aug 17, 2:36 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	54 min
Aug 17, 2:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	79 min
Aug 17, 2:45 PM EDT	Tornado Warning	PHI	Carbon, Northampton	45 min
Aug 17, 2:54 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	66 min
Aug 17, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	19 min
Aug 17, 4:51 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	43 min
Aug 17, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	19 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2007 Severe Thunderstorm Warnings in Pennsylvania, 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.