Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 95, NWS Philadelphia/Mount Holly

July 18, 2012Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2012, 1:02 PM EDT for Sussex County, New Jersey. It was in force for 34 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, 1:02 PM EDT (17:02 UTC)
Expired: Jul 18, 2012, 1:36 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Sussex County, NJ

The radar

The Philadelphia radar (KDIX), 146 km from the middle of the area, began a volume at 17:03 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, 1:20 PM EDT	HAIL 0.88	Sussex, NJ

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, 5.0 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: 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.

570 
WUUS51 KPHI 181702
SVRPHI
NJC037-181800-
/O.NEW.KPHI.SV.W.0095.120718T1702Z-120718T1800Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF MONTAGUE...

* UNTIL 200 PM EDT

* AT 1259 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 NEAR
  MONTAGUE...AND MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SUSSEX AROUND 115 PM EDT...
  VERNON VALLEY AROUND 135 PM EDT...
  HIGHLAND LAKE AROUND 140 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 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 4123 7440 4120 7437 4113 7445 4121 7485
      4130 7483 4135 7476 4136 7469
TIME...MOT...LOC 1702Z 280DEG 19KT 4128 7470

$$

MEOLA

2 follow-up statements

565 
WWUS51 KPHI 181714
SVSPHI

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

NJC037-181800-
/O.CON.KPHI.SV.W.0095.000000T0000Z-120718T1800Z/
SUSSEX NJ-
114 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR NORTHEASTERN SUSSEX COUNTY...

AT 112 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR SUSSEX...OR 11 MILES EAST OF MONTAGUE...MOVING EAST AT
25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  VERNON VALLEY BY 125 PM EDT...
  HIGHLAND LAKE BY 130 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4124 7443 4122 7439 4120 7437 4113 7445
      4120 7479 4135 7467
TIME...MOT...LOC 1714Z 279DEG 23KT 4126 7457

$$

GORSE

039 
WWUS51 KPHI 181736
SVSPHI

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

NJC037-181745-
/O.CAN.KPHI.SV.W.0095.000000T0000Z-120718T1800Z/
SUSSEX NJ-
136 PM EDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SUSSEX COUNTY IS
CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED, THEREFORE 
THE WARNING HAS BEEN CANCELLED. ADDITIONAL THUNDERSTORMS HOWEVER 
CONTINUE TO DEVELOP IN THE AREA.

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.

LAT...LON 4124 7443 4122 7439 4120 7437 4113 7445
      4120 7479 4135 7467
TIME...MOT...LOC 1735Z 279DEG 23KT 4124 7439

$$

GORSE

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, 1:11 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, 3:26 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Warren	49 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

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.