Alert archive / New Jersey / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 176, NWS Philadelphia/Mount Holly

July 18, 2006Hunterdon County, Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2006, 7:56 PM EDT for Hunterdon County, Mercer County, New Jersey. It was in force for 34 min. 4 reports 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 18, 2006, 7:56 PM EDT (23:56 UTC)
Expired: Jul 18, 2006, 8:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Hunterdon County, NJ, Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 23:59 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 18, 8:15 PM EDT	TSTM WND DMG	Trenton, NJ	TREES AND WIRES DOWN.
Jul 18, 8:16 PM EDT	TSTM WND DMG	Lambertville, NJ	TREES AND POWER LINES DOWN COUNTYWIDE.
Jul 18, 8:16 PM EDT	TSTM WND DMG	Lambertville, NJ	TREES/ POWERLINES DOWN COUNTYWIDE.
Jul 18, 8:31 PM EDT	TSTM WND GST 46	Trenton, NJ	A 46 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE TRENTON-MERCER COUNTY AIRPORT.

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 18, 12:38 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 18, 6:37 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.9 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: 1100 J/kg
Mixed-layer CIN: -174 J/kg
Mixed-layer LCL: 1804 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 16 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 182357
SVRPHI
NJC019-021-190030-
/O.NEW.KPHI.SV.W.0176.060718T2356Z-060719T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
756 PM EDT TUE JUL 18 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY
  THIS INCLUDES THE CITY OF TRENTON
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY

* UNTIL 830 PM EDT

* AT 755 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 15 MILES SOUTHWEST OF FRENCHTOWN TO 16 MILES   
  SOUTHWEST OF TRENTON...AND MOVING EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  7 MILES SOUTH OF FRENCHTOWN BY 815 PM EDT...
  WHITE HORSE...TRENTON AND EWING BY 820 PM EDT...
  FLEMINGTON...PENNINGTON...MERCERVILLE-HAMILTON SQUARE AND
  LAWRENCEVILLE BY 825 PM EDT...

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

WIND DAMAGE WITH THIS STORM MAY OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

LAT...LON 4056 7515 4016 7472 4024 7450 4040 7476
      4071 7489

$$

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 6:04 PM EDT	Severe Thunderstorm Warning	PHI	Warren	56 min
Jul 18, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	60 min
Jul 18, 6:46 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	44 min
Jul 18, 7:20 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	55 min
Jul 18, 7:35 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	55 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2006 Every severe thunderstorm warning in 2006

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.