Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 162, NWS Philadelphia/Mount Holly

July 29, 2007Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2007, 11:58 AM EDT for Somerset County, New Jersey. It was in force for 62 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 29, 2007, 11:58 AM EDT (15:58 UTC)
Expired: Jul 29, 2007, 1:00 PM EDT
In force: 62 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 15:59 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 29, 12:22 PM EDT	TSTM WND DMG	2 Sw Millstone, NJ	WIRES REPORTED DOWN IN HILLSBOROUGH.

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 12:00Z, 4.0 hours before the alert went out and 158 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: 593 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 944 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 8 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 291600 RRA
SVRPHI
NJC035-291700-
/O.NEW.KPHI.SV.W.0162.070729T1558Z-070729T1700Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1159 AM EDT SUN JUL 29 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 100 PM EDT

* AT 1157 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND     
  DAMAGING WINDS TO 60 MPH. THIS STORM WAS LOCATED NEAR              
  SKILLMAN...OR ABOUT 12 MILES NORTH OF TRENTON...AND MOVING         
  NORTHEAST AT ABOUT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKY
  HILL...BELLE MEAD...MILLSTONE AND SOMERSET

VERY HEAVY RAIN WILL ACCOMPANY THIS STORM, WHICH MAY RESULT IN 
LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE WATER IS 
CROSSING THE ROAD.

IN ADDITION TO HAIL AND DAMAGING WINDS...FREQUENT 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.

LAT...LON 4046 7478 4038 7472 4037 7464 4048 7447
      4055 7456

$$

GORSE

1 follow-up statement

000 
WWUS51 KPHI 291633
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1233 PM EDT SUN JUL 29 2007

NJC035-291700-
/O.CON.KPHI.SV.W.0162.000000T0000Z-070729T1700Z/
SOMERSET NJ-
1233 PM EDT SUN JUL 29 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 PM EDT
FOR SOUTHERN SOMERSET COUNTY...

AT 1230 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE 
HAIL...AND DAMAGING WINDS TO 60 MPH. THIS STORM WAS LOCATED NEAR 
BELLE MEAD...OR ABOUT 9 MILES WEST OF NEW BRUNSWICK...MOVING 
NORTHEAST AT 15 MPH.

VERY HEAVY RAIN AND FREQUENT CLOUD TO GROUND LIGHTNING WILL OCCUR 
WITH THIS STORM. STAY INDOORS UNTIL THE STORM COMPLETELY CLEARS YOUR 
LOCATION.

LAT...LON 4049 7471 4041 7467 4039 7461 4048 7447
      4055 7456

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 6:15 AM EDT	Special Marine Warning	PHI		90 min
Jul 29, 11:01 AM EDT	Severe Thunderstorm Warning	PHI	Cape May	59 min
Jul 29, 11:59 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	91 min
Jul 29, 12:23 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	67 min
Jul 29, 12:52 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	53 min
Jul 29, 12:57 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	63 min
Jul 29, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	44 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.