Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 104, NWS Philadelphia/Mount Holly

July 18, 2012Middlesex County, Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2012, 4:30 PM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 45 min. 3 reports 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, 4:30 PM EDT (20:30 UTC)
Expired
Jul 18, 2012, 5:15 PM EDT
In force
45 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 20:31 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

TimeReportWhereRemark
Jul 18, 4:35 PM EDTTSTM WND DMGRaritan, NJLARGE BRANCHES BROKEN
Jul 18, 4:48 PM EDTHAIL 0.88Hillsborough, NJ
Jul 18, 5:01 PM EDTTSTM WND GST 60Perth Amboy, 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.

IssuedProductOfficeLasted
Jul 18, 12:41 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.5 hours before the alert went out and 137 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2129 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

207 
WUUS51 KPHI 182030
SVRPHI
NJC023-027-035-182115-
/O.NEW.KPHI.SV.W.0104.120718T2030Z-120718T2115Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITIES OF...PERTH AMBOY...NEW BRUNSWICK...
  SOUTH CENTRAL MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  THIS INCLUDES THE CITY OF SOMERVILLE...

* UNTIL 515 PM EDT

* AT 427 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR BRIDGEWATER...OR NEAR      
  SOMERVILLE...AND MOVING EAST AT 30 MPH. THIS STORM IS ALSO CAPABLE 
  OF PRODUCING HAIL TO THE SIZE OF NICKELS.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BOUND BROOK AND MARTINSVILLE AROUND 435 PM EDT...
  MIDDLESEX AROUND 440 PM EDT...
  SOCIETY HILL AROUND 445 PM EDT...
  EDISON AROUND 450 PM EDT...
  COLONIA AROUND 455 PM EDT...
  PERTH AMBOY AROUND 500 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 4055 7424 4048 7426 4045 7422 4045 7476
      4051 7478 4062 7471 4064 7473 4070 7471
      4073 7474 4078 7437 4073 7437 4067 7445
      4067 7439 4060 7444 4060 7421 4057 7420
TIME...MOT...LOC 2028Z 268DEG 25KT 4058 7464

$$

GORSE
2 follow-up statements
283 
WWUS51 KPHI 182054
SVSPHI

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

NJC027-182102-
/O.CAN.KPHI.SV.W.0104.000000T0000Z-120718T2115Z/
MORRIS NJ-
454 PM EDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MORRIS COUNTY IS
CANCELLED...

THE STRONGER PORTION OF THE STORM HAS MOVED OUT OF THE AREA, 
THEREFORE THE WARNING HAS BEEN CANCELLED.

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 4055 7424 4048 7426 4045 7422 4045 7476
      4051 7478 4058 7471 4067 7471 4070 7451
      4067 7453 4065 7452 4067 7446 4067 7439
      4060 7444 4060 7421 4057 7420
TIME...MOT...LOC 2052Z 268DEG 25KT 4052 7454

$$

NJC023-035-182115-
/O.CON.KPHI.SV.W.0104.000000T0000Z-120718T2115Z/
SOMERSET NJ-MIDDLESEX NJ-
454 PM EDT WED JUL 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHERN MIDDLESEX AND SOMERSET COUNTIES...

AT 448 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR MANVILLE...OR NEAR 
SOMERVILLE...MOVING EAST AT 30 MPH. THIS STORM IS ALSO CAPABLE OF 
PRODUCING HAIL UP TO THE SIZE OF NICKELS.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SOCIETY HILL...NEW BRUNSWICK...DUNELLEN AND NORTH BRUNSWICK BY 500
  PM EDT...
  HIGHLAND PARK...SOUTH PLAINFIELD AND MILLTOWN BY 505 PM EDT...
  EDISON AND METUCHEN BY 510 PM EDT...
  FORDS BY 515 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...HAIL...AND DEADLY CLOUD TO GROUND 
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY 
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. 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 4055 7424 4048 7426 4045 7422 4045 7476
      4051 7478 4058 7471 4067 7471 4070 7451
      4067 7453 4065 7452 4067 7446 4067 7439
      4060 7444 4060 7421 4057 7420
TIME...MOT...LOC 2052Z 268DEG 25KT 4052 7454

$$

GORSE
715 
WWUS51 KPHI 182109
SVSPHI

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

NJC023-035-182118-
/O.EXP.KPHI.SV.W.0104.000000T0000Z-120718T2115Z/
SOMERSET NJ-MIDDLESEX NJ-
509 PM EDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MIDDLESEX AND
SOMERSET COUNTIES WILL EXPIRE AT 515 PM EDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS, THEREFORE THE 
WARNING WILL BE ALLOWED TO EXPIRE.

LOCAL WIND GUSTS UP TO 40 MPH, HEAVY RAIN AND CLOUD TO GROUND 
LIGHTNING HOWEVER WILL OCCUR WITH THIS STORM.

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 4055 7424 4048 7426 4045 7422 4045 7476
      4051 7478 4058 7471 4067 7471 4070 7451
      4067 7453 4065 7452 4067 7446 4067 7439
      4060 7444 4060 7421 4057 7420
TIME...MOT...LOC 2108Z 268DEG 25KT 4052 7439

$$

GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 12:51 PM EDTSpecial Weather StatementPHISussex54 min
Jul 18, 1:02 PM EDTSevere Thunderstorm WarningPHISussex34 min
Jul 18, 1:11 PM EDTSpecial Weather StatementPHISussex34 min
Jul 18, 1:23 PM EDTSpecial Weather StatementPHIMorris37 min
Jul 18, 1:43 PM EDTAreal Flood AdvisoryPHISussex2 hr
Jul 18, 1:49 PM EDTSevere Thunderstorm WarningPHISussex26 min
Jul 18, 1:53 PM EDTSpecial Weather StatementPHIMercer37 min
Jul 18, 2:15 PM EDTSpecial Weather StatementPHISussex60 min
Jul 18, 2:23 PM EDTSpecial Weather StatementPHIWarren67 min
Jul 18, 2:46 PM EDTSevere Thunderstorm WarningPHIMiddlesex29 min
Jul 18, 3:00 PM EDTSpecial Weather StatementPHIMonmouth45 min
Jul 18, 3:04 PM EDTSpecial Weather StatementPHIWarren41 min
Jul 18, 3:13 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren47 min
Jul 18, 3:18 PM EDTSpecial Marine WarningPHI42 min
Jul 18, 3:25 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex65 min
Jul 18, 3:26 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Warren49 min
Jul 18, 3:29 PM EDTSpecial Weather StatementPHIMonmouth46 min
Jul 18, 3:43 PM EDTSpecial Weather StatementPHIWarren47 min
Jul 18, 3:52 PM EDTFlash Flood WarningPHIWarren113 min
Jul 18, 3:59 PM EDTFlash Flood WarningPHIMorris, Sussex107 min
Jul 18, 4:03 PM EDTSpecial Weather StatementPHIHunterdon42 min
Jul 18, 4:17 PM EDTSpecial Weather StatementPHIMorris43 min
Jul 18, 4:28 PM EDTSevere Thunderstorm WarningPHIHunterdon32 min
Jul 18, 4:41 PM EDTSpecial Weather StatementPHIMercer34 min
Jul 18, 4:53 PM EDTSpecial Weather StatementPHIMercer22 min
Jul 18, 5:01 PM EDTSpecial Weather StatementPHIMiddlesex29 min
Jul 18, 5:07 PM EDTSpecial Marine WarningPHI38 min
Jul 18, 5:11 PM EDTSpecial Weather StatementPHIMiddlesex, Somerset64 min
Jul 18, 5:12 PM EDTAreal Flood AdvisoryPHIHunterdon, Middlesex, Somerset81 min
Jul 18, 5:19 PM EDTSevere Thunderstorm WarningPHIMonmouth41 min
Jul 18, 5:26 PM EDTSpecial Marine WarningPHI34 min
Jul 18, 5:33 PM EDTSpecial Weather StatementPHIMercer57 min
Jul 18, 5:44 PM EDTSpecial Marine WarningPHI31 min
Jul 18, 6:00 PM EDTSpecial Marine WarningPHI60 min
Jul 18, 6:09 PM EDTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean68 min
Jul 18, 6:32 PM EDTSpecial Weather StatementPHIOcean43 min
Jul 18, 6:45 PM EDTSpecial Weather StatementPHICape May, Cumberland60 min
Jul 18, 6:51 PM EDTSpecial Marine WarningPHI39 min
Jul 18, 6:51 PM EDTSpecial Marine WarningPHI39 min
Jul 18, 7:17 PM EDTSpecial Weather StatementPHICape May58 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2012Every 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.