Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 129, NWS Philadelphia/Mount Holly

July 26, 2012Mercer County, Middlesex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 26, 2012, 6:59 PM EDT for Mercer County, Middlesex County, New Jersey. It was in force for 76 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 26, 2012, 6:59 PM EDT (22:59 UTC)
Expired: Jul 26, 2012, 8:15 PM EDT
In force: 76 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Mercer County, NJ, Middlesex County, NJ

The radar

The Philadelphia radar (KDIX), 51 km from the middle of the area, began a volume at 23:00 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 26, 7:28 PM EDT	TSTM WND DMG	Edison, NJ	NUMEROUS TREES AND POWER LINES DOWN

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 26, 3:57 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 11.0 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: 1459 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 160 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.

182 
WUUS51 KPHI 262259
SVRPHI
NJC021-023-270015-
/O.NEW.KPHI.SV.W.0129.120726T2259Z-120727T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
659 PM EDT THU JUL 26 2012

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...
  MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...

* UNTIL 815 PM EDT

* AT 655 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING ACROSS NORTHERN AND WESTERN
  HUNTERDON COUNTY AND INTO BUCKS COUNTY...AND MOVING EAST AT 45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PENNINGTON AND HOPEWELL AROUND 710 PM EDT...
  TRENTON...LAWRENCEVILLE AND EWING AROUND 715 PM EDT...
  WHITE HORSE...PRINCETON AND MIDDLESEX AROUND 720 PM EDT...
  SOUTH BRUNSWICK AND EDINBURG AROUND 725 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME 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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
THURSDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE
THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 100 AM EDT FRIDAY
MORNING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN
NEW JERSEY.

&&

LAT...LON 4050 7426 4046 7422 4041 7425 4027 7440
      4018 7462 4014 7459 4018 7469 4015 7472
      4034 7494 4034 7486 4037 7487 4042 7477
      4038 7472 4038 7461 4042 7459 4049 7446
      4056 7453 4060 7446 4062 7431 4060 7420
TIME...MOT...LOC 2256Z 284DEG 37KT 4073 7473 4034 7501

$$

IOVINO

1 follow-up statement

270 
WWUS51 KPHI 262345
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
745 PM EDT THU JUL 26 2012

NJC021-023-270015-
/O.CON.KPHI.SV.W.0129.000000T0000Z-120727T0015Z/
MERCER NJ-MIDDLESEX NJ-
745 PM EDT THU JUL 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR MIDDLESEX AND MERCER COUNTIES...

AT 742 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER 
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM WOODBRIDGE TO EAST 
BRUNSWICK TO LAWRENCEVILLE...MOVING EAST AT 50 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT 
THURSDAY EVENING FOR CENTRAL NEW JERSEY.

&&

LAT...LON 4050 7426 4046 7422 4041 7425 4027 7440
      4018 7462 4014 7459 4018 7469 4015 7472
      4034 7494 4034 7486 4037 7487 4042 7477
      4038 7472 4038 7461 4042 7459 4049 7446
      4056 7453 4060 7446 4062 7431 4060 7420
TIME...MOT...LOC 2344Z 286DEG 44KT 4059 7419 4020 7448

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 5:26 AM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Monmouth, Ocean	18 hr
Jul 26, 6:54 AM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	66 min
Jul 26, 7:41 AM EDT	Special Weather Statement	PHI	Sussex, Warren	64 min
Jul 26, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	74 min
Jul 26, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	83 min
Jul 26, 7:28 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	63 min
Jul 26, 7:31 PM EDT	Special Marine Warning	PHI		89 min
Jul 26, 7:37 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Ocean	83 min
Jul 26, 7:58 PM EDT	Special Marine Warning	PHI		2 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Every severe thunderstorm warning in 2012

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.