Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 209, 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, 5:17 PM EDT for Hunterdon County, New Jersey; Bucks County, Pennsylvania. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 17, 2007, 5:17 PM EDT (21:17 UTC)
Expired: Aug 17, 2007, 6:15 PM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Hunterdon County, NJ, Bucks County, PA

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, 9.3 hours before the alert went out and 183 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 172117
SVRPHI
NJC019-PAC017-172215-
/O.NEW.KPHI.SV.W.0209.070817T2117Z-070817T2215Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 615 PM EDT

* AT 514 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES NORTH OF SPRINGTOWN...OR ABOUT NEAR
  BETHLEHEM...AND MOVING SOUTHEAST AT 60 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILFORD...FERNDALE AND 6 MILES NORTHEAST OF REVERE BY 525 PM EDT...
  FRENCHTOWN AND ERWINNA BY 530 PM EDT...
  FLEMINGTON...SAND BROOK AND SERGEANTSVILLE BY 535 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 4077 7488 4065 7475 4041 7483 4032 7501
      4054 7533 4061 7520 4060 7519 4058 7519
      4068 7504 4069 7500 4071 7497 4077 7491
TIME...MOT...LOC 2117Z 297DEG 55KT 4064 7524

$$

JJM

1 follow-up statement

000 
WWUS51 KPHI 172152
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
551 PM EDT FRI AUG 17 2007

PAC017-172201-
/O.CAN.KPHI.SV.W.0209.000000T0000Z-070817T2215Z/
BUCKS PA-
551 PM EDT FRI AUG 17 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BUCKS COUNTY IS
CANCELLED...

THUNDERSTORMS HAVE MOVED OUT OF THE COUNTY. THE SEVERE THUNDERSTORM 
WARNING HAS THEREFORE BEEN CANCELLED.

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

LAT...LON 4076 7486 4065 7475 4042 7483 4037 7495
      4050 7507 4053 7507 4055 7508 4057 7513
      4059 7516 4068 7504 4069 7500 4077 7489
TIME...MOT...LOC 2151Z 283DEG 36KT 4056 7486

$$

NJC019-172215-
/O.CON.KPHI.SV.W.0209.000000T0000Z-070817T2215Z/
HUNTERDON NJ-
551 PM EDT FRI AUG 17 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR HUNTERDON COUNTY...

AT 547 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CLINTON...OR ABOUT 24 MILES EAST OF BETHLEHEM...MOVING
EAST AT 40 MPH.

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

LAT...LON 4076 7486 4065 7475 4042 7483 4037 7495
      4050 7507 4053 7507 4055 7508 4057 7513
      4059 7516 4068 7504 4069 7500 4077 7489
TIME...MOT...LOC 2151Z 283DEG 36KT 4056 7486

$$

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, 3:20 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, 5:41 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; the sounding from the Mesonet's radiosonde archive.