Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 156, NWS Philadelphia/Mount Holly

August 3, 2012Hunterdon County, Mercer County, New Jersey; Bucks County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 3, 2012, 6:23 PM EDT for Hunterdon County, Mercer County, New Jersey; Bucks County, Philadelphia County, Pennsylvania. It was in force for 43 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
Aug 3, 2012, 6:23 PM EDT (22:23 UTC)
Expired
Aug 3, 2012, 7:06 PM EDT
In force
43 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Mercer County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 22:26 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
Aug 3, 6:30 PM EDTTSTM WND DMGMiddletown Twp, PATREE LIMBS AND WIRES DOWN.
Aug 3, 6:40 PM EDTTSTM WND DMGFalls Twp, PATREE LIMBS AND WIRES DOWN.
Aug 3, 6:50 PM EDTTSTM WND DMGBristol Twp, PATREE LIMBS AND WIRES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.4 hours before the alert went out and 134 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, Phillips Aaf/Abe, MD at 12:00Z on 2012-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1112 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, Phillips Aaf/Abe, MD at 12:00Z on 2012-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
1112 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
37 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.

803 
WUUS51 KPHI 032223
SVRPHI
NJC019-021-PAC017-101-032330-
/O.NEW.KPHI.SV.W.0156.120803T2223Z-120803T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  THIS INCLUDES THE CITY OF TRENTON...
  SOUTH CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 730 PM EDT

* AT 622 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
  LANGHORNE...OR 11 MILES SOUTHWEST OF TRENTON...AND MOVING NORTHEAST
  AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LANGHORNE AND LANGHORNE AROUND 630 PM EDT...
  LEVITTOWN AROUND 635 PM EDT...
  NEWTOWN AND TULLYTOWN AROUND 640 PM EDT...
  WOODSIDE AROUND 655 PM EDT...
  YARDLEY AROUND 700 PM EDT...
  EWING AND TRENTON AROUND 710 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.

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 4018 7469 4018 7471 4016 7471 4013 7476
      4013 7482 4008 7487 4007 7495 4012 7503
      4014 7501 4018 7508 4043 7486 4026 7456
TIME...MOT...LOC 2223Z 224DEG 11KT 4016 7494

$$

HEAVENER
2 follow-up statements
327 
WWUS51 KPHI 032247
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
647 PM EDT FRI AUG 3 2012

NJC019-PAC101-032257-
/O.CAN.KPHI.SV.W.0156.000000T0000Z-120803T2330Z/
HUNTERDON NJ-PHILADELPHIA PA-
647 PM EDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PHILADELPHIA AND
SOUTH CENTRAL HUNTERDON 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.

LAT...LON 4018 7469 4018 7471 4016 7471 4013 7476
      4013 7482 4008 7487 4017 7503 4036 7480
      4024 7459
TIME...MOT...LOC 2247Z 224DEG 11KT 4021 7487

$$

NJC021-PAC017-032330-
/O.CON.KPHI.SV.W.0156.000000T0000Z-120803T2330Z/
MERCER NJ-BUCKS PA-
647 PM EDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR SOUTHEASTERN BUCKS AND MERCER COUNTIES...

AT 643 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 WOODBOURNE...OR 7 MILES WEST OF TRENTON...MOVING
NORTHEAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  WOODSIDE BY 655 PM EDT...
  MORRISVILLE AND YARDLEY BY 700 PM EDT...
  EWING...TRENTON AND 7 MILES NORTHWEST OF WHITE HORSE BY 710 PM
  EDT...
  PENNINGTON AND 7 MILES NORTHWEST OF MERCERVILLE-HAMILTON SQUARE BY
  725 PM EDT...
  LAWRENCEVILLE AND 8 MILES NORTHWEST OF EDINBURG BY 730 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4018 7469 4018 7471 4016 7471 4013 7476
      4013 7482 4008 7487 4017 7503 4036 7480
      4024 7459
TIME...MOT...LOC 2247Z 224DEG 11KT 4021 7487

$$

HEAVENER
367 
WWUS51 KPHI 032306
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
706 PM EDT FRI AUG 3 2012

NJC021-PAC017-032315-
/O.CAN.KPHI.SV.W.0156.000000T0000Z-120803T2330Z/
MERCER NJ-BUCKS PA-
706 PM EDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BUCKS AND MERCER
COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS ALL BUT DISSIPATED. THERE 
COULD STILL BE A FEW CLOUD TO GROUND LIGHTNING STRIKES AND A WIND 
GUST UPWARDS OF 30 MPH.

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 4018 7469 4018 7471 4016 7471 4013 7476
      4013 7482 4008 7487 4017 7503 4036 7480
      4024 7459
TIME...MOT...LOC 2305Z 224DEG 11KT 4025 7482

$$

HEAVENER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 3:38 PM EDTSpecial Weather StatementPHIBurlington67 min
Aug 3, 4:17 PM EDTSevere Thunderstorm WarningPHICumberland, Salem58 min
Aug 3, 4:21 PM EDTSpecial Marine WarningPHI84 min
Aug 3, 4:35 PM EDTSpecial Weather StatementPHIMonmouth55 min
Aug 3, 4:45 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean60 min
Aug 3, 5:12 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester63 min
Aug 3, 5:35 PM EDTSpecial Weather StatementPHIMercer55 min
Aug 3, 5:42 PM EDTSpecial Weather StatementPHIMercer63 min
Aug 3, 5:46 PM EDTAreal Flood AdvisoryPHIGloucester101 min
Aug 3, 5:55 PM EDTSpecial Weather StatementPHIBurlington65 min
Aug 3, 6:20 PM EDTAreal Flood AdvisoryPHIBurlington, Mercer2 hr
Aug 3, 2:39 PM EDTSpecial Weather StatementPHIChester66 min
Aug 3, 4:15 PM EDTSpecial Weather StatementPHIDelaware60 min
Aug 3, 7:33 PM EDTSpecial Weather StatementPHIBucks57 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.