Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 214, NWS Philadelphia/Mount Holly

September 8, 20125 counties in New Jersey; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 8, 2012, 3:45 PM EDT for 5 counties in New Jersey; 5 counties in Pennsylvania. It was in force for 60 min. 7 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
Sep 8, 2012, 3:45 PM EDT (19:45 UTC)
Expired
Sep 8, 2012, 4:45 PM EDT
In force
60 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Morris County, NJ, Sussex County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 111 km from the middle of the area, began a volume at 19:45 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 8, 3:48 PM EDTTSTM WND DMGCoopersburg, PATREES AND A POWER LINE DOWN IN COOPERSBURG.
Sep 8, 3:50 PM EDTTSTM WND DMGSpringtown, PATREE DOWN AT INTERSECTION OF OLD BETHLEHEM ROAD AND HILLTOP ROAD.
Sep 8, 3:58 PM EDTTSTM WND DMGPerkasie, PATREE DOWN ONTO A HOUSE ALONG NORTH FIFTH STREET. NO INJURIES REPORTED.
Sep 8, 4:17 PM EDTTSTM WND DMGClinton, NJLARGE TREE LIMBS AND WIRES DOWN ACROSS EAST MAIN STREET IN CLINTON. ROAD CLOSED AND A TRANSFORMER KNOCKED OUT.
Sep 8, 4:28 PM EDTTSTM WND DMGNewton, NJLARGE TREE LIMBS DOWN IN NEWTON.
Sep 8, 4:30 PM EDTTSTM WND GST 60Chester, NJESTIMATED WIND GUST OF 55 TO 60 MPH.
Sep 8, 4:31 PM EDTTSTM WND GST 50Andover, 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
Sep 8, 12:15 PM EDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.8 hours before the alert went out and 178 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 2012-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 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 2012-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
173 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

658 
WUUS51 KPHI 081945
SVRPHI
NJC019-021-027-037-041-PAC017-077-089-091-095-082045-
/O.NEW.KPHI.SV.W.0214.120908T1945Z-120908T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
345 PM EDT SAT SEP 8 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  EASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  EASTERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  WESTERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
  HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
  THIS INCLUDES THE CITY OF NEWTON...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...
  NORTHERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 445 PM EDT

* AT 340 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 13 MILES NORTHEAST OF ALPINE MOUNTAIN TO NORTHAMPTON TO
  ZIONSVILLE TO ROYERSFORD...OR ALONG A LINE EXTENDING FROM 25 MILES
  NORTHWEST OF NEWTON TO 7 MILES NORTH OF ALLENTOWN TO 9 MILES SOUTH
  OF ALLENTOWN TO 15 MILES NORTH OF WEST CHESTER...AND MOVING EAST AT
  45 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  STORMVILLE...SPRINGTOWN...PLEASANT VALLEY AND WIND GAP AROUND 350
  PM EDT...
  SOUDERTON...PERKASIE...OLD ORCHARD AND NAZARETH AROUND 355 PM
  EDT...
  WERRY LAKE AND REVERE AROUND 400 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 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 1000 PM EDT
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4124 7442 4072 7472 4058 7472 4051 7478
      4051 7479 4039 7473 4015 7552 4020 7558
      4045 7550 4067 7558 4125 7521 4125 7512
      4115 7514 4109 7503 4116 7491 4135 7476
      4136 7469
TIME...MOT...LOC 1945Z 250DEG 39KT 4130 7506 4071 7544
          4049 7536 4019 7547

$$

MPD
1 follow-up statement
452 
WWUS51 KPHI 082020
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
420 PM EDT SAT SEP 8 2012

PAC077-089-091-095-082029-
/O.CAN.KPHI.SV.W.0214.000000T0000Z-120908T2045Z/
LEHIGH PA-MONROE PA-MONTGOMERY PA-NORTHAMPTON PA-
420 PM EDT SAT SEP 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHAMPTON...NORTHERN
MONTGOMERY...EASTERN MONROE AND EASTERN LEHIGH 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 SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1000 PM EDT 
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW 
JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4123 7442 4072 7472 4058 7472 4051 7478
      4039 7473 4025 7520 4028 7525 4067 7500
      4084 7510 4086 7505 4092 7508 4102 7506
      4108 7497 4109 7499 4135 7476 4136 7469
TIME...MOT...LOC 2019Z 250DEG 39KT 4142 7460 4083 7498
          4061 7490 4031 7502

$$

NJC019-021-027-037-041-PAC017-082045-
/O.CON.KPHI.SV.W.0214.000000T0000Z-120908T2045Z/
WARREN NJ-HUNTERDON NJ-MERCER NJ-MORRIS NJ-SUSSEX NJ-BUCKS PA-
420 PM EDT SAT SEP 8 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CENTRAL BUCKS...SUSSEX...WESTERN MORRIS...NORTHWESTERN MERCER...
HUNTERDON AND WARREN COUNTIES...

AT 415 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 6 MILES NORTH OF HIGH POINT TO BELVIDERE TO CLINTON TO
DOYLESTOWN...OR ALONG A LINE EXTENDING FROM 25 MILES NORTH OF NEWTON
TO 13 MILES NORTHEAST OF EASTON TO 15 MILES SOUTHEAST OF EASTON TO 17
MILES WEST OF TRENTON...MOVING EAST AT 45 MPH.

THE STORMS HAVE A HISTORY OF FELLING TREES ACROSS EASTERN 
PENNSYLVANIA. 

SEVERE THUNDERSTORMS WILL BE NEAR...
  NEWTON...LEBANON...LAMBERTVILLE AND GREAT MEADOWS BY 425 PM EDT...
  WHITE HOUSE STATION...SUSSEX...LONG VALLEY AND HACKETTSTOWN BY 430
  PM EDT...
  LAKE MOHAWK AND HAMBURG BY 435 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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 1000 PM EDT
SATURDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4123 7442 4072 7472 4058 7472 4051 7478
      4039 7473 4025 7520 4028 7525 4067 7500
      4084 7510 4086 7505 4092 7508 4102 7506
      4108 7497 4109 7499 4135 7476 4136 7469
TIME...MOT...LOC 2019Z 250DEG 39KT 4142 7460 4083 7498
          4061 7490 4031 7502

$$

MPD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 9:15 PM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean23 hr
Sep 8, 8:31 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester82 min
Sep 8, 9:31 AM EDTSpecial Weather StatementPHIMonmouth59 min
Sep 8, 10:17 AM EDTSpecial Weather StatementPHIMonmouth43 min
Sep 8, 4:07 PM EDTSpecial Weather StatementPHICamden, Gloucester, Mercer, Middlesex, Morris, Salem and 1 more83 min
Sep 8, 4:29 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more61 min
Sep 8, 5:30 PM EDTSpecial Weather StatementPHIBurlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more90 min
Sep 8, 5:47 PM EDTSpecial Marine WarningPHI58 min
Sep 8, 6:17 PM EDTSpecial Weather StatementPHIAtlantic, Cape May, Cumberland58 min
Sep 8, 6:25 PM EDTSpecial Marine WarningPHI110 min
Sep 8, 7:09 PM EDTSpecial Weather StatementPHIAtlantic, Ocean36 min
Sep 8, 7:16 PM EDTSpecial Marine WarningPHI89 min
Sep 8, 7:43 PM EDTSpecial Marine WarningPHI57 min
Sep 8, 7:51 PM EDTSpecial Weather StatementPHIOcean54 min
Sep 8, 2:40 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton65 min
Sep 8, 2:52 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe53 min

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.