Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 147, NWS Philadelphia/Mount Holly

July 23, 2008Hunterdon County, Mercer County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2008, 3:26 PM EDT for Hunterdon County, Mercer County, Somerset County, New Jersey. It was in force for 64 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: Jul 23, 2008, 3:26 PM EDT (19:26 UTC)
Expired: Jul 23, 2008, 4:30 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 65 km from the middle of the area, began a volume at 19:27 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
Jul 23, 3:32 PM EDT	HAIL 1.75	Pennington, NJ

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
Jul 23, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.4 hours before the alert went out and 155 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: 302 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 822 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -55 m²/s²
0-3 km storm-relative helicity: 71 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 231927
SVRPHI
NJC019-021-035-232030-
/O.NEW.KPHI.SV.W.0147.080723T1926Z-080723T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
326 PM EDT WED JUL 23 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  SOUTHEASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 430 PM EDT

* AT 325 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 
  PENNINGTON...AND MOVING NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOPEWELL BY 340 PM...
  SKILLMAN BY 345 PM...
  CLOVERHILL BY 350 PM...
  BELLE MEAD BY 355 PM...
  FLAGTOWN AND MILLSTONE BY 400 PM...
  SOMERVILLE...BRIDGEWATER AND MANVILLE BY 410 PM...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
SOUTHEAST PENNSYLVANIA.

LAT...LON 4058 7450 4055 7453 4054 7453 4052 7451
      4029 7473 4033 7494 4041 7481 4043 7488
      4070 7476 4059 7447 4058 7447
TIME...MOT...LOC 1926Z 211DEG 24KT 4032 7483

$$

IOVINO

1 follow-up statement

000 
WWUS51 KPHI 231942
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
342 PM EDT WED JUL 23 2008

NJC019-021-035-232030-
/O.CON.KPHI.SV.W.0147.000000T0000Z-080723T2030Z/
HUNTERDON NJ-SOMERSET NJ-MERCER NJ-
342 PM EDT WED JUL 23 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN MERCER...SOMERSET AND SOUTHEASTERN HUNTERDON
COUNTIES...

AT 341 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR HOPEWELL...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  CLOVERHILL BY 350 PM EDT...
  BELLE MEAD BY 355 PM EDT...
  FLAGTOWN BY 400 PM EDT...
  MILLSTONE BY 405 PM EDT...
  RARITAN...SOMERVILLE AND MANVILLE BY 410 PM EDT...
  BRIDGEWATER AND BOUND BROOK BY 415 PM EDT...

THE STORM PRODUCED GOLF BALL SIZED HAIL IN PENNINGTON.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEAST PENNSYLVANIA.

LAT...LON 4058 7450 4055 7453 4054 7453 4052 7451
      4029 7473 4033 7494 4041 7481 4043 7488
      4070 7476 4059 7447 4058 7447
TIME...MOT...LOC 1942Z 211DEG 24KT 4041 7476

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:02 AM EDT	Special Marine Warning	PHI		58 min
Jul 23, 3:51 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	25 hr
Jul 23, 2:44 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	46 min
Jul 23, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	Mercer	35 min
Jul 23, 2:58 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	47 min
Jul 23, 3:30 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	60 min
Jul 23, 4:03 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	57 min
Jul 23, 4:09 PM EDT	Tornado Warning	PHI	Middlesex, Somerset	36 min
Jul 23, 4:51 PM EDT	Areal Flood Warning	PHI	Middlesex, Somerset	105 min
Jul 23, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	57 min
Jul 23, 5:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Somerset	62 min
Jul 23, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	60 min
Jul 23, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	35 min
Jul 23, 7:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	57 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2008 Every severe thunderstorm warning in 2008

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; radar from the NEXRAD Level II archive.