Alert archive / New Jersey / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 197, NWS Philadelphia/Mount Holly

August 2, 2008Hunterdon County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 2, 2008, 11:31 AM EDT for Hunterdon County, Somerset County, New Jersey. It was in force for 59 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 2, 2008, 11:31 AM EDT (15:31 UTC)
Expired: Aug 2, 2008, 12:30 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 15:34 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
Aug 2, 11:34 AM EDT	TSTM WND DMG	Milford, NJ	TREES DOWN IN HOLLAND TWP AND MILFORD. PEA SIZE HAIL ALSO REPORTED.

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 2, 10:39 AM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 3.5 hours before the alert went out and 160 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: 84 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1436 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 021531
SVRPHI
NJC019-035-021630-
/O.NEW.KPHI.SV.W.0197.080802T1531Z-080802T1630Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1131 AM EDT SAT AUG 2 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1230 PM EDT

* AT 1130 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  MILFORD...OR ABOUT 12 MILES SOUTHEAST OF EASTON...AND MOVING EAST
  AT 41 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CLINTON...ANNANDALE AND HIGH BRIDGE BY 1140 AM...
  LEBANON BY 1145 AM...
  WHITE HOUSE STATION BY 1150 AM...
  BRIDGEWATER...FAR HILLS AND SOMERVILLE BY NOON...
  MARTINSVILLE BY 1205 PM...
  BASKING RIDGE BY 1210 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE
WATER IS CROSSING THE ROAD.

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 600 PM SATURDAY
EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
SOUTHEASTERN PENNSYLVANIA.

LAT...LON 4057 7450 4055 7453 4053 7451 4047 7451
      4040 7474 4042 7475 4041 7480 4038 7481
      4035 7492 4051 7507 4055 7508 4059 7515
      4070 7498 4073 7454 4070 7451 4064 7452
      4065 7450
TIME...MOT...LOC 1531Z 260DEG 36KT 4059 7501

$$

RNS

1 follow-up statement

000 
WWUS51 KPHI 021617
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1217 PM EDT SAT AUG 2 2008

NJC019-035-021630-
/O.CON.KPHI.SV.W.0197.000000T0000Z-080802T1630Z/
HUNTERDON NJ-SOMERSET NJ-
1217 PM EDT SAT AUG 2 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM EDT
FOR SOMERSET AND SOUTHEASTERN HUNTERDON COUNTIES...

AT 1214 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR CLOVERHILL...OR 12 MILES SOUTHWEST OF SOMERVILLE...
MOVING EAST AT 31 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SKILLMAN...FLAGTOWN...BELLE MEAD...MARTINSVILLE...BRIDGEWATER...
BASKING RIDGE...RARITAN...MILLSTONE...MANVILLE...FAR HILLS AND BOUND
BROOK

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 600 PM EDT
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND SOUTHEASTERN PENNSYLVANIA.

LAT...LON 4057 7450 4055 7453 4053 7451 4047 7451
      4040 7474 4042 7475 4041 7480 4038 7481
      4036 7489 4044 7487 4059 7472 4073 7463
      4073 7454 4070 7451 4064 7452 4065 7450
TIME...MOT...LOC 1617Z 257DEG 27KT 4046 7474

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 6:55 AM EDT	Special Marine Warning	PHI		65 min
Aug 2, 7:20 AM EDT	Special Marine Warning	PHI		115 min
Aug 2, 7:40 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	65 min
Aug 2, 8:08 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic	52 min
Aug 2, 8:31 AM EDT	Special Marine Warning	PHI		119 min
Aug 2, 9:22 AM EDT	Special Marine Warning	PHI		24 min
Aug 2, 10:51 AM EDT	Areal Flood Advisory	PHI	Sussex, Warren	3 hr
Aug 2, 12:06 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	54 min
Aug 2, 12:54 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	66 min
Aug 2, 1:22 PM EDT	Special Marine Warning	PHI		53 min
Aug 2, 4:35 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	55 min
Aug 2, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	65 min
Aug 2, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	Warren	55 min
Aug 2, 5:58 PM EDT	Special Marine Warning	PHI		62 min
Aug 2, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	56 min
Aug 2, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset, Warren	26 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.