Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 228, NWS Philadelphia/Mount Holly

September 18, 2012Morris County, Sussex County, Warren County, New Jersey; Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 18, 2012, 5:13 PM EDT for Morris County, Sussex County, Warren County, New Jersey; Monroe County, Northampton County, Pennsylvania. It was in force for 62 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
Sep 18, 2012, 5:13 PM EDT (21:13 UTC)
Expired
Sep 18, 2012, 6:15 PM EDT
In force
62 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 124 km from the middle of the area, began a volume at 21:16 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
Sep 18, 5:55 PM EDTTSTM WND DMGVernon Twp, NJTREES AND WIRES DOWN THROUGHOUT THE COUNTY

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
Sep 18, 12:10 PM EDTTornado WatchSPC9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.2 hours before the alert went out and 156 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 2012-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 114 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 224 square meters per square second.19395878Sfc1 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
114 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
721 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
224 m²/s²
0-3 km storm-relative helicity
267 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

322 
WUUS51 KPHI 182113
SVRPHI
NJC027-037-041-PAC089-095-182215-
/O.NEW.KPHI.SV.W.0228.120918T2113Z-120918T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
513 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  EAST CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
  SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 615 PM EDT

* AT 511 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 FLATBROOKVILLE TO ROXBURG...OR ALONG A LINE EXTENDING FROM 12
  MILES WEST OF NEWTON TO 8 MILES NORTHEAST OF EASTON...AND MOVING   
  NORTHEAST AT 45 MPH.

THE STRONGEST WINDS MAY OCCUR NEAR THE LEADING EDGE OF THE LINE.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PLEASANT VALLEY...HOPE...OXFORD AND BRASS CASTLE AROUND 520 PM
  EDT...
  CRANDON LAKES...WASHINGTON AND FIVE POINTS AROUND 525 PM EDT...
  GREAT MEADOWS AND GREAT MEADOWS-VIENNA AROUND 530 PM EDT...
  BRANCHVILLE AROUND 535 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF STORMS MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT WAIT 
TO HEAR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY INSIDE 
A STURDY STRUCTURE AND STAY 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 TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM EDT TUESDAY EVENING
FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 4121 7437 4109 7450 4104 7450 4105 7445
      4102 7443 4100 7430 4094 7428 4075 7484
      4079 7489 4071 7497 4065 7516 4115 7513
      4115 7508 4109 7502 4116 7491 4132 7480
      4136 7471
TIME...MOT...LOC 2113Z 263DEG 28KT 4109 7496 4076 7508

$$

GORSE
1 follow-up statement
450 
WWUS51 KPHI 182144
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
544 PM EDT TUE SEP 18 2012

PAC089-095-182153-
/O.CAN.KPHI.SV.W.0228.000000T0000Z-120918T2215Z/
MONROE PA-NORTHAMPTON PA-
544 PM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NORTHAMPTON AND
EAST CENTRAL MONROE COUNTIES IS 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM EDT TUESDAY EVENING
FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

LAT...LON 4122 7438 4110 7450 4104 7450 4105 7445
      4102 7442 4100 7430 4094 7428 4075 7484
      4079 7489 4071 7498 4068 7507 4132 7480
      4136 7472 4135 7469
TIME...MOT...LOC 2143Z 257DEG 24KT 4128 7462 4071 7493

$$

NJC027-037-041-182215-
/O.CON.KPHI.SV.W.0228.000000T0000Z-120918T2215Z/
WARREN NJ-MORRIS NJ-SUSSEX NJ-
544 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SUSSEX...NORTHERN MORRIS AND EASTERN WARREN COUNTIES...

AT 541 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.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM HIGH POINT TO WASHINGTON...OR ALONG A LINE EXTENDING
FROM 17 MILES NORTH OF NEWTON TO 14 MILES EAST OF EASTON...MOVING
NORTHEAST AT 45 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  SUSSEX AND ANDOVER BY 550 PM EDT...
  LAKE MOHAWK AND BUDD LAKE BY 555 PM EDT...
  STANHOPE...OGDENSBURG...NETCONG AND LONG VALLEY BY 600 PM EDT...
  VERNON VALLEY AND MOUNT ARLINGTON BY 605 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF STORMS MAY CONTAIN LITTLE OR NO LIGHTNING. DO 
NOT WAIT FOR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY 
INSIDE A STURDY STRUCTURE AND STAY 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 TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM EDT TUESDAY EVENING
FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 4122 7438 4110 7450 4104 7450 4105 7445
      4102 7442 4100 7430 4094 7428 4075 7484
      4079 7489 4071 7498 4068 7507 4132 7480
      4136 7472 4135 7469
TIME...MOT...LOC 2143Z 257DEG 39KT 4128 7462 4071 7493

$$

GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 8:54 PM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean23 hr
Sep 18, 4:13 AM EDTCoastal Flood AdvisoryPHIBurlington, Camden, Gloucester, Salem21 hr
Sep 18, 4:21 PM EDTSevere Thunderstorm WarningPHISalem69 min
Sep 18, 4:23 PM EDTSevere Thunderstorm WarningPHIWarren52 min
Sep 18, 4:26 PM EDTAreal Flood AdvisoryPHISussex, Warren3 hr
Sep 18, 5:01 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren59 min
Sep 18, 5:12 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Warren63 min
Sep 18, 5:12 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester78 min
Sep 18, 5:23 PM EDTSevere Thunderstorm WarningPHISalem52 min
Sep 18, 6:00 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 3 more60 min
Sep 18, 6:02 PM EDTSpecial Marine WarningPHI88 min
Sep 18, 6:06 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Morris, Somerset and 2 more54 min
Sep 18, 6:46 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Salem119 min
Sep 18, 6:52 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Monmouth, Morris, Somerset53 min
Sep 18, 6:54 PM EDTAreal Flood AdvisoryPHIBurlington, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more111 min
Sep 18, 7:04 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Cumberland56 min
Sep 18, 7:16 PM EDTAreal Flood AdvisoryPHICape May59 min
Sep 18, 7:51 PM EDTSpecial Weather StatementPHIAtlantic, Cape May, Ocean54 min
Sep 18, 7:52 PM EDTSpecial Marine WarningPHI77 min
Sep 18, 7:56 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Cape May, Ocean64 min
Sep 18, 12:58 PM EDTAreal Flood AdvisoryPHICarbon, Monroe93 min
Sep 18, 12:59 PM EDTSpecial Weather StatementPHIBerks, Lehigh46 min
Sep 18, 1:05 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh115 min
Sep 18, 1:32 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh43 min
Sep 18, 2:00 PM EDTSpecial Weather StatementPHIChester, Montgomery60 min
Sep 18, 2:18 PM EDTSpecial Weather StatementPHICarbon, Monroe57 min
Sep 18, 2:23 PM EDTSevere Thunderstorm WarningPHIChester, Montgomery30 min
Sep 18, 2:25 PM EDTFlash Flood WarningPHICarbon, Lehigh, Monroe, Northampton4 hr
Sep 18, 2:52 PM EDTSevere Thunderstorm WarningPHIBucks, Lehigh, Northampton17 min
Sep 18, 3:07 PM EDTAreal Flood WarningPHIBerks, Lehigh8 hr
Sep 18, 3:16 PM EDTSpecial Weather StatementPHIMonroe59 min
Sep 18, 3:24 PM EDTSpecial Weather StatementPHIBerks, Carbon51 min
Sep 18, 3:52 PM EDTSpecial Weather StatementPHIChester53 min
Sep 18, 4:05 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh55 min
Sep 18, 4:19 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery56 min
Sep 18, 4:35 PM EDTAreal Flood AdvisoryPHIBucks, Chester, Lehigh, Montgomery55 min
Sep 18, 6:19 PM EDTAreal Flood WarningPHICarbon, Lehigh, Monroe, Northampton16 hr

Nearby

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