Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 101, NWS Philadelphia/Mount Holly

July 18, 2012Hunterdon County, Morris County, Warren County, New Jersey; Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2012, 3:26 PM EDT for Hunterdon County, Morris County, Warren County, New Jersey; Northampton County, Pennsylvania. 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 18, 2012, 3:26 PM EDT (19:26 UTC)
Expired: Jul 18, 2012, 4:15 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Hunterdon County, NJ, Morris County, NJ, Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 19:27 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, 3:48 PM EDT	TSTM WND DMG	White Twp, NJ	TREES AND WIRES REPORTED DOWN ON ROUTE 46.

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, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.4 hours before the alert went out and 163 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: 2129 J/kg
Mixed-layer CIN: -147 J/kg
Mixed-layer LCL: 1491 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 95 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.

806 
WUUS51 KPHI 181926
SVRPHI
NJC019-027-041-PAC095-182015-
/O.NEW.KPHI.SV.W.0101.120718T1926Z-120718T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
326 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHWESTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
  NORTHEASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOUTHERN WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 415 PM EDT

* AT 322 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM GREAT MEADOWS-VIENNA TO ROXBURG...OR ALONG A LINE EXTENDING
  FROM 16 MILES SOUTHWEST OF NEWTON TO 10 MILES NORTHEAST OF
  EASTON...AND MOVING EAST AT 10 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  GREAT MEADOWS AND GREAT MEADOWS-VIENNA AROUND 335 PM EDT...
  ROXBURG AROUND 340 PM EDT...
  ALLAMUCHY AND ALLAMUCHY-PANTHER VALLEY AROUND 350 PM EDT...
  OXFORD AROUND 355 PM EDT...
  HACKETTSTOWN AROUND 400 PM EDT...
  BRASS CASTLE...WASHINGTON AND PLEASANT VALLEY AROUND 415 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 900 PM EDT
WEDNESDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4073 7469 4072 7472 4071 7472 4069 7474
      4081 7537 4095 7497 4085 7452
TIME...MOT...LOC 1926Z 284DEG 7KT 4086 7492 4081 7513

$$

DRAG

2 follow-up statements

169 
WWUS51 KPHI 181955
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
355 PM EDT WED JUL 18 2012

NJC019-027-041-PAC095-182015-
/O.CON.KPHI.SV.W.0101.000000T0000Z-120718T2015Z/
WARREN NJ-HUNTERDON NJ-MORRIS NJ-NORTHAMPTON PA-
355 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN NORTHAMPTON...SOUTHWESTERN MORRIS...NORTHEASTERN
HUNTERDON AND SOUTHERN WARREN COUNTIES...

AT 352 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH AS WELL AS TORRENTIAL RAINFALL.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM GREAT MEADOWS TO 
OXFORD...OR ALONG A LINE EXTENDING FROM 16 MILES SOUTHWEST OF NEWTON 
TO 15 MILES NORTHEAST OF EASTON...MOVING EAST AT 35 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HACKETTSTOWN...ALLAMUCHY AND ALLAMUCHY-PANTHER VALLEY BY 400 PM
  EDT...
  BUDD LAKE AND BEATTYESTOWN BY 405 PM EDT...
  CALIFON BY 410 PM EDT...
  SUCCASUNNA...CHESTER AND LONG VALLEY BY 415 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO HAIL AND DAMAGING WINDS...CONTINUOUS 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 900 PM EDT
WEDNESDAY EVENING FOR NORTHEAST NEW JERSEY. A SEVERE THUNDERSTORM
WATCH ALSO REMAINS IN EFFECT UNTIL 900 PM EDT WEDNESDAY EVENING FOR
NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND
EASTERN PENNSYLVANIA.

&&

LAT...LON 4073 7469 4072 7472 4071 7472 4069 7474
      4081 7537 4095 7497 4085 7452
TIME...MOT...LOC 1954Z 272DEG 31KT 4085 7489 4084 7499

$$

DRAG

140 
WWUS51 KPHI 182012
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
412 PM EDT WED JUL 18 2012

NJC019-027-041-PAC095-182015-
/O.CON.KPHI.SV.W.0101.000000T0000Z-120718T2015Z/
WARREN NJ-HUNTERDON NJ-MORRIS NJ-NORTHAMPTON PA-
412 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR NORTHEASTERN NORTHAMPTON...SOUTHWESTERN MORRIS...NORTHEASTERN
HUNTERDON AND SOUTHERN WARREN COUNTIES...

AT 409 PM EDT...A LINE OF WEAKENING THUNDERSTORMS WAS 
LOCATED ALONG A LINE EXTENDING FROM BUDD LAKE TO HACKETTSTOWN...OR 
ALONG A LINE EXTENDING FROM 13 MILES WEST OF MORRISTOWN TO 15 MILES 
SOUTH OF NEWTON...MOVING EAST AT 35 MPH.

THE STORMS WERE WEAKENING. 

LAT...LON 4073 7469 4072 7472 4071 7472 4069 7474
      4081 7537 4095 7497 4085 7452
TIME...MOT...LOC 2011Z 272DEG 31KT 4084 7470 4083 7480

$$


DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 12:51 PM EDT	Special Weather Statement	PHI	Sussex	54 min
Jul 18, 1:02 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	34 min
Jul 18, 1:11 PM EDT	Special Weather Statement	PHI	Sussex	34 min
Jul 18, 1:23 PM EDT	Special Weather Statement	PHI	Morris	37 min
Jul 18, 1:43 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Jul 18, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	26 min
Jul 18, 1:53 PM EDT	Special Weather Statement	PHI	Mercer	37 min
Jul 18, 2:15 PM EDT	Special Weather Statement	PHI	Sussex	60 min
Jul 18, 2:23 PM EDT	Special Weather Statement	PHI	Warren	67 min
Jul 18, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex	29 min
Jul 18, 3:00 PM EDT	Special Weather Statement	PHI	Monmouth	45 min
Jul 18, 3:04 PM EDT	Special Weather Statement	PHI	Warren	41 min
Jul 18, 3:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	47 min
Jul 18, 3:18 PM EDT	Special Marine Warning	PHI		42 min
Jul 18, 3:25 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex	65 min
Jul 18, 3:29 PM EDT	Special Weather Statement	PHI	Monmouth	46 min
Jul 18, 3:43 PM EDT	Special Weather Statement	PHI	Warren	47 min
Jul 18, 3:52 PM EDT	Flash Flood Warning	PHI	Warren	113 min
Jul 18, 3:59 PM EDT	Flash Flood Warning	PHI	Morris, Sussex	107 min
Jul 18, 4:03 PM EDT	Special Weather Statement	PHI	Hunterdon	42 min
Jul 18, 4:17 PM EDT	Special Weather Statement	PHI	Morris	43 min
Jul 18, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	32 min
Jul 18, 4:30 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	45 min
Jul 18, 4:41 PM EDT	Special Weather Statement	PHI	Mercer	34 min
Jul 18, 4:53 PM EDT	Special Weather Statement	PHI	Mercer	22 min
Jul 18, 5:01 PM EDT	Special Weather Statement	PHI	Middlesex	29 min
Jul 18, 5:07 PM EDT	Special Marine Warning	PHI		38 min
Jul 18, 5:11 PM EDT	Special Weather Statement	PHI	Middlesex, Somerset	64 min
Jul 18, 5:12 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Somerset	81 min
Jul 18, 5:19 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	41 min
Jul 18, 5:26 PM EDT	Special Marine Warning	PHI		34 min
Jul 18, 5:33 PM EDT	Special Weather Statement	PHI	Mercer	57 min
Jul 18, 5:44 PM EDT	Special Marine Warning	PHI		31 min
Jul 18, 6:00 PM EDT	Special Marine Warning	PHI		60 min
Jul 18, 6:09 PM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	68 min
Jul 18, 6:32 PM EDT	Special Weather Statement	PHI	Ocean	43 min
Jul 18, 6:45 PM EDT	Special Weather Statement	PHI	Cape May, Cumberland	60 min
Jul 18, 6:51 PM EDT	Special Marine Warning	PHI		39 min
Jul 18, 6:51 PM EDT	Special Marine Warning	PHI		39 min
Jul 18, 7:17 PM EDT	Special Weather Statement	PHI	Cape May	58 min
Jul 18, 1:27 PM EDT	Special Weather Statement	PHI	Monroe	33 min
Jul 18, 2:07 PM EDT	Special Weather Statement	PHI	Berks	38 min
Jul 18, 2:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jul 18, 2:43 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	47 min
Jul 18, 3:36 PM EDT	Special Weather Statement	PHI	Berks	54 min
Jul 18, 3:51 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	28 min
Jul 18, 4:22 PM EDT	Special Weather Statement	PHI	Bucks	23 min
Jul 18, 5:30 PM EDT	Special Weather Statement	PHI	Bucks	60 min
Jul 18, 5:51 PM EDT	Special Weather Statement	PHI	Philadelphia	54 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012 Severe Thunderstorm Warnings in Pennsylvania, 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.