Alert archive / New Jersey / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 125, NWS Philadelphia/Mount Holly

July 6, 2007Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 6, 2007, 5:41 PM EDT for Mercer County, 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: Jul 6, 2007, 5:41 PM EDT (21:41 UTC)
Expired: Jul 6, 2007, 6:30 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 21:41 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 6, 6:15 PM EDT	HAIL 0.25	Lawrenceville, NJ	SPOTTER REPORTED PEA SIZE HAIL IN LAWRENCEVILLE BETWEEN 615 PM AND 616 PM

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, 9.7 hours before the alert went out and 166 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: 39 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 062141
SVRPHI
NJC021-062230-
/O.NEW.KPHI.SV.W.0125.070706T2141Z-070706T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
541 PM EDT FRI JUL 6 2007

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...

* UNTIL 630 PM EDT

* AT 537 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  NORTHWEST OF HOPEWELL...OR ABOUT 16 MILES NORTH OF TRENTON...AND
  MOVING SOUTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PENNINGTON AND 8 MILES NORTHEAST OF EWING BY 550 PM EDT...
  PRINCETON...LAWRENCEVILLE AND 9 MILES NORTHEAST OF TRENTON BY 555
  PM EDT...
  MERCERVILLE-HAMILTON SQUARE AND 8 MILES NORTHEAST OF WHITE HORSE BY
  600 PM EDT...

LAT...LON 4019 7458 4019 7473 4034 7490 4035 7485
      4037 7486 4038 7481 4041 7480 4042 7475
      4037 7472 4039 7464 4037 7462 4034 7465
      4028 7452 4024 7448

$$

JJM

1 follow-up statement

000 
WWUS51 KPHI 062224
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT FRI JUL 6 2007

NJC021-062232-
/O.EXP.KPHI.SV.W.0125.000000T0000Z-070706T2230Z/
MERCER NJ-
623 PM EDT FRI JUL 6 2007

...THE SEVERE THUNDERSTORM WARNING FOR MERCER COUNTY EXPIRES AT
630 PM EDT...

THE THUNDERSTORM THAT PROMPTED THE WARNING IS WEAKENING ACROSS 
EASTERN MERCER COUNTY, THEREFORE THE WARNING WILL BE ALLOWED TO 
EXPIRE AT 630 PM.

LAT...LON 4019 7458 4019 7473 4034 7490 4035 7485
      4037 7486 4038 7481 4041 7480 4042 7475
      4037 7472 4039 7464 4037 7462 4034 7465
      4028 7452 4024 7448

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 12:34 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth	56 min
Jul 6, 12:55 AM EDT	Special Marine Warning	PHI		65 min
Jul 6, 2:10 PM EDT	Excessive Heat Watch	PHI	Burlington, Camden, Gloucester, Mercer	48 hr
Jul 6, 5:00 PM EDT	Severe Thunderstorm Warning	PHI	Warren	21 min
Jul 6, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	52 min
Jul 6, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Somerset	48 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.