Alert archive / New Jersey / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 118, NWS Philadelphia/Mount Holly

November 10, 2015Mercer County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Nov 10, 2015, 2:07 PM EST for Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 23 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: Nov 10, 2015, 2:07 PM EST (19:07 UTC)
Expired: Nov 10, 2015, 2:30 PM EST
In force: 23 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Mercer County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 19:10 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
Nov 10, 2:15 PM EST	HAIL 0.75	Ewing, NJ

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.1 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 432 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 309 m²/s²
0-3 km storm-relative helicity: 580 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.

507 
WUUS51 KPHI 101907
SVRPHI
NJC021-PAC017-101930-
/O.NEW.KPHI.SV.W.0118.151110T1907Z-151110T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
207 PM EST TUE NOV 10 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 230 PM EST

* AT 206 PM EST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED OVER YARDLEY...OR NEAR TRENTON...AND MOVING NORTHEAST
  AT 45 MPH. BRIEF HEAVY DOWNPOURS CAN ALSO BE EXPECTED.

* LOCATIONS IMPACTED INCLUDE...
  TRENTON...EWING...PRINCETON...HIGHTSTOWN...PENNINGTON...YARDLEY...
  NEWTOWN...WOODSIDE...WASHINGTON CROSSING...LAWRENCEVILLE...
  EDINBURG...MERCERVILLE-HAMILTON SQUARE...LEVITTOWN...PLAINSBORO
  CENTER...MORRISVILLE...PRINCETON JUNCTION...PRINCETON NORTH...
  WOODBOURNE...NEWTOWN GRANT AND FAIRLESS HILLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4015 7487 4025 7498 4038 7473 4037 7472
      4039 7467 4038 7462 4035 7463 4033 7462
      4032 7459 4029 7456 4028 7451
TIME...MOT...LOC 1906Z 238DEG 41KT 4024 7484 

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 10, 7:35 AM EST	Gale Warning	PHI		20 hr
Nov 10, 2:27 PM EST	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Somerset	33 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2015 Severe Thunderstorm Warnings in Pennsylvania, 2015 Every severe thunderstorm warning in 2015

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.