Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 239, NWS Philadelphia/Mount Holly

October 19, 20074 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 19, 2007, 10:53 PM EDT for 4 counties in New Jersey. It was in force for 49 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: Oct 19, 2007, 10:53 PM EDT (02:53 UTC)
Expired: Oct 19, 2007, 11:42 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 02:53 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
Oct 19, 11:00 PM EDT	TSTM WND DMG	Somerville, NJ	SEVERAL TREES DOWN THROUGHOUT THE COUNTY. A FEW VEHICLES DAMAGED.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 2.9 hours before the alert went out and 151 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: 323 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 200254
SVRPHI
NJC019-021-027-035-200400-
/O.NEW.KPHI.SV.W.0239.071020T0253Z-071020T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1053 PM EDT FRI OCT 19 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTH CENTRAL MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTH CENTRAL MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  EASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL MIDNIGHT EDT

* AT 1049 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM PEAPACK AND GLADSTONE TO WHITE HOUSE STATION TO HOPEWELL...OR
  ALONG A LINE EXTENDING FROM 21 MILES NORTHWEST OF NEW BRUNSWICK TO
  18 MILES NORTHWEST OF NEW BRUNSWICK TO 11 MILES NORTH OF TRENTON...
  AND MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  FLAGTOWN...BRIDGEWATER...SKILLMAN AND BELLE MEAD BY 1100 PM EDT...
  BASKING RIDGE...MARTINSVILLE...SOMERVILLE AND ROCKY HILL BY 1105 PM
  EDT...
  MILLINGTON AND 6 MILES SOUTH OF MORRISTOWN BY 1110 PM EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.


LAT...LON 4081 7445 4037 7463 4038 7488 4080 7473
TIME...MOT...LOC 0253Z 266DEG 31KT 4070 7470 4059 7472
          4038 7479

$$
 
TFG

2 follow-up statements

000 
WWUS51 KPHI 200320
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1120 PM EDT FRI OCT 19 2007

NJC019-021-200330-
/O.CAN.KPHI.SV.W.0239.000000T0000Z-071020T0400Z/
HUNTERDON NJ-MERCER NJ-
1120 PM EDT FRI OCT 19 2007

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTH CENTRAL MERCER
AND EASTERN HUNTERDON COUNTIES IS CANCELLED...

LAT...LON 4038 7463 4039 7465 4038 7467 4039 7474
      4044 7477 4056 7473 4057 7471 4058 7472
      4080 7465 4081 7445
TIME...MOT...LOC 0320Z 266DEG 31KT 4077 7452 4064 7459
          4048 7464 4039 7469

$$

NJC027-035-200400-
/O.CON.KPHI.SV.W.0239.000000T0000Z-071020T0400Z/
MORRIS NJ-SOMERSET NJ-
1120 PM EDT FRI OCT 19 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT
FOR SOMERSET AND SOUTH CENTRAL MORRIS COUNTIES...

AT 1119 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM MORRISTOWN TO MARTINSVILLE TO BELLE MEAD TO
SKILLMAN...OR ALONG A LINE EXTENDING FROM 19 MILES WEST OF NEWARK TO
13 MILES NORTHWEST OF NEW BRUNSWICK TO 11 MILES WEST OF NEW BRUNSWICK
TO 12 MILES NORTH OF TRENTON...MOVING EAST AT 35 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  MORRISTOWN...MILLINGTON...MARTINSVILLE AND ROCKY HILL BY 1125 PM
  EDT...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4038 7463 4039 7465 4038 7467 4039 7474
      4044 7477 4056 7473 4057 7471 4058 7472
      4080 7465 4081 7445
TIME...MOT...LOC 0320Z 266DEG 31KT 4077 7452 4064 7459
          4048 7464 4039 7469

$$

TFG

000 
WWUS51 KPHI 200342
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1142 PM EDT FRI OCT 19 2007

NJC027-035-200352-
/O.CAN.KPHI.SV.W.0239.000000T0000Z-071020T0400Z/
MORRIS NJ-SOMERSET NJ-
1142 PM EDT FRI OCT 19 2007

...THE SEVERE THUNDERSTORM WARNING FOR SOMERSET AND SOUTH CENTRAL
MORRIS COUNTIES IS CANCELLED...

THE LINE OF SEVERE STORMS HAS MOVED EAST OF THE WARNING AREA. 


LAT...LON 4038 7463 4039 7465 4038 7467 4039 7474
      4044 7477 4056 7473 4057 7471 4058 7472
      4080 7465 4081 7445
TIME...MOT...LOC 0342Z 266DEG 31KT 4075 7426 4063 7434
          4047 7439 4038 7445

$$
 
TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 19, 10:20 PM EDT	Special Marine Warning	PHI		55 min
Oct 19, 11:15 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	41 min
Oct 19, 11:33 PM EDT	Special Marine Warning	PHI		57 min
Oct 19, 11:36 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Middlesex, Monmouth, Ocean	54 min
Oct 19, 11:38 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Ocean	67 min
Oct 19, 11:42 PM EDT	Special Marine Warning	PHI		63 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; radar from the NEXRAD Level II archive.