Alert archive / New Jersey / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 146, NWS Philadelphia/Mount Holly

July 28, 2012Hunterdon County, Mercer County, Somerset County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2012, 8:38 PM EDT for Hunterdon County, Mercer County, Somerset County, New Jersey; Bucks County, Pennsylvania. It was in force for 67 min. 16 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 28, 2012, 8:38 PM EDT (00:38 UTC)
Expired
Jul 28, 2012, 9:45 PM EDT
In force
67 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 00:38 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 28, 8:47 PM EDTHAIL 0.75Washington Crossing, PA
Jul 28, 8:52 PM EDTHAIL 1Titusville, NJ
Jul 28, 8:55 PM EDTTSTM WND DMGUpper Makefield Twp, PATREE DOWN ONTO A HOUSE IN UPPER MAKEFIELD TWP. NO INJURIES REPORTED.
Jul 28, 8:55 PM EDTTSTM WND DMGWashington Crossing, PATREES AND POWER POLES DOWN. WINDS ESTIMATED 60-70 MPH.
Jul 28, 8:55 PM EDTHAIL 0.88Washington Crossing, PA
Jul 28, 9:11 PM EDTTSTM WND GST 63Trenton Airport, NJ63 MPH THUNDERSTORM WIND GUST AT TRENTON AIRPORT.
Jul 28, 9:15 PM EDTTSTM WND DMGEwing, NJLARGE TREE DOWN ACROSS ROAD
Jul 28, 9:20 PM EDTHAIL 0.75Princeton, NJ
Jul 28, 9:22 PM EDTHAIL 0.75Lawrence Twp, NJ
Jul 28, 9:26 PM EDTHAIL 1Pennington, NJ
Jul 28, 9:27 PM EDTHAIL 0.88Princeton Junction, NJ
Jul 28, 9:29 PM EDTHAIL 0.75Lawrence Twp, NJ
Jul 28, 9:29 PM EDTHAIL 0.88Princeton Junction, NJ
Jul 28, 9:30 PM EDTHAIL 0.5Lawrenceville, NJ
Jul 28, 9:36 PM EDTHAIL 1Princeton Junction, NJ
Jul 28, 9:53 PM EDTHAIL 0.88Princeton Junction, NJTIME EST..MAY HAVE OCCURRED BETWEEN 930-938P.

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 28, 1:36 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.6 hours before the alert went out and 169 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 00:00Z on 2012-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 69 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 00:00Z on 2012-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939587897Sfc1 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
69 J/kg
Mixed-layer CIN
-143 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
20 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.

388 
WUUS51 KPHI 290038
SVRPHI
NJC019-021-035-PAC017-290145-
/O.NEW.KPHI.SV.W.0146.120729T0038Z-120729T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
838 PM EDT SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MERCER COUNTY IN CENTRAL NEW JERSEY...
  SOUTHWESTERN SOMERSET COUNTY IN NORTHERN NEW JERSEY...
  SOUTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  EAST CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 945 PM EDT

* AT 833 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
  NEW HOPE...OR 15 MILES NORTHWEST OF TRENTON...AND MOVING EAST AT 20
  MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PENNINGTON AND 6 MILES NORTH OF EWING AROUND 905 PM EDT...
  HOPEWELL AROUND 910 PM EDT...
  LAWRENCEVILLE AROUND 915 PM EDT...
  SKILLMAN AROUND 920 PM EDT...
  PRINCETON AROUND 930 PM EDT...
  ROCKY HILL AROUND 935 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4024 7501 4043 7505 4051 7503 4049 7458
      4042 7458 4039 7459 4036 7463 4034 7463
      4030 7458 4021 7458
TIME...MOT...LOC 0038Z 270DEG 15KT 4035 7495

$$

HAYES
3 follow-up statements
306 
WWUS51 KPHI 290108
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
908 PM EDT SAT JUL 28 2012

NJC019-021-035-PAC017-290145-
/O.CON.KPHI.SV.W.0146.000000T0000Z-120729T0145Z/
HUNTERDON NJ-MERCER NJ-SOMERSET NJ-BUCKS PA-
908 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR EAST CENTRAL BUCKS...SOUTHWESTERN SOMERSET...MERCER AND
SOUTHEASTERN HUNTERDON COUNTIES...

AT 903 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 PENNINGTON...OR 9 MILES NORTH OF TRENTON...MOVING EAST
AT 15 MPH.

THIS STORM PRODUCED QUARTER SIZED HAIL IN TITUSVILLE.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LAWRENCEVILLE AND SKILLMAN BY 920 PM EDT...
  PRINCETON BY 930 PM EDT...
  PRINCETON NORTH AND ROCKY HILL BY 935 PM EDT...
  KINGSTON...PRINCETON JUNCTION AND 6 MILES NORTH OF EDINBURG BY 940
  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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4021 7458 4023 7493 4041 7492 4050 7493
      4049 7458 4040 7459 4036 7463 4034 7463
      4032 7462 4030 7458
TIME...MOT...LOC 0108Z 270DEG 15KT 4035 7479

$$

HAYES
713 
WWUS51 KPHI 290131
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
931 PM EDT SAT JUL 28 2012

NJC019-PAC017-290142-
/O.CAN.KPHI.SV.W.0146.000000T0000Z-120729T0145Z/
HUNTERDON NJ-BUCKS PA-
931 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BUCKS AND
SOUTHEASTERN 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4021 7458 4022 7479 4023 7480 4042 7479
      4043 7475 4050 7479 4049 7458 4040 7459
      4037 7463 4032 7462 4030 7458
TIME...MOT...LOC 0132Z 270DEG 15KT 4035 7466

$$

NJC021-035-290145-
/O.CON.KPHI.SV.W.0146.000000T0000Z-120729T0145Z/
MERCER NJ-SOMERSET NJ-
931 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR SOUTHWESTERN SOMERSET AND CENTRAL MERCER COUNTIES...

AT 929 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.
 THIS STORM WAS LOCATED NEAR PRINCETON...OR 10 MILES NORTHEAST OF
TRENTON...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PRINCETON JUNCTION AND 6 MILES NORTH OF EDINBURG BY 940 PM EDT...
  7 MILES NORTH OF WINDSOR BY 945 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
SATURDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4021 7458 4022 7479 4023 7480 4042 7479
      4043 7475 4050 7479 4049 7458 4040 7459
      4037 7463 4032 7462 4030 7458
TIME...MOT...LOC 0132Z 270DEG 15KT 4035 7466

$$

HAYES
723 
WWUS51 KPHI 290140
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
940 PM EDT SAT JUL 28 2012

NJC021-035-290150-
/O.EXP.KPHI.SV.W.0146.000000T0000Z-120729T0145Z/
MERCER NJ-SOMERSET NJ-
940 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SOMERSET AND
CENTRAL MERCER COUNTIES WILL EXPIRE AT 945 PM EDT...

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 NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4021 7458 4022 7479 4023 7480 4042 7479
      4043 7475 4050 7479 4049 7458 4040 7459
      4037 7463 4032 7462 4030 7458
TIME...MOT...LOC 0140Z 270DEG 15KT 4035 7462

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 8:02 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer2 hr
Jul 28, 8:05 PM EDTSevere Thunderstorm WarningPHIHunterdon55 min
Jul 28, 8:11 PM EDTSpecial Marine WarningPHI64 min
Jul 28, 8:26 PM EDTAreal Flood AdvisoryPHIMercer101 min
Jul 28, 8:41 PM EDTSpecial Weather StatementPHIGloucester, Salem64 min
Jul 28, 8:43 PM EDTSpecial Marine WarningPHI62 min
Jul 28, 9:14 PM EDTSpecial Marine WarningPHI61 min
Jul 28, 9:21 PM EDTSevere Thunderstorm WarningPHICape May23 min
Jul 28, 9:24 PM EDTSevere Thunderstorm WarningPHIMercer, Middlesex, Monmouth66 min
Jul 28, 9:42 PM EDTSpecial Marine WarningPHI63 min
Jul 28, 9:46 PM EDTSpecial Weather StatementPHIBurlington, Ocean59 min
Jul 28, 9:52 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth118 min
Jul 28, 9:52 PM EDTSpecial Weather StatementPHICamden53 min
Jul 28, 10:09 PM EDTSpecial Marine WarningPHI66 min
Jul 28, 10:23 PM EDTSevere Thunderstorm WarningPHIMonmouth32 min
Jul 28, 10:31 PM EDTSpecial Marine WarningPHI59 min
Jul 28, 10:39 PM EDTSpecial Weather StatementPHIOcean66 min
Jul 29, 12:22 AM EDTSpecial Marine WarningPHI23 min
Jul 29, 1:20 PM EDTSpecial Weather StatementPHIAtlantic55 min
Jul 29, 1:42 PM EDTAreal Flood AdvisoryPHICape May2 hr
Jul 29, 2:59 PM EDTSpecial Weather StatementPHICape May61 min
Jul 29, 3:35 PM EDTSpecial Weather StatementPHIAtlantic55 min
Jul 29, 4:41 PM EDTSpecial Weather StatementPHIHunterdon, Morris, Somerset64 min
Jul 29, 5:53 PM EDTSpecial Weather StatementPHIMiddlesex52 min
Jul 28, 8:19 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery56 min
Jul 28, 9:11 PM EDTSpecial Weather StatementPHIBucks, Philadelphia64 min
Jul 29, 3:03 PM EDTSpecial Weather StatementPHIBerks, Lehigh57 min
Jul 29, 3:40 PM EDTAreal Flood AdvisoryPHIBerks, Chester74 min
Jul 29, 5:32 PM EDTSpecial Weather StatementPHICarbon, Lehigh, Northampton58 min
Jul 29, 6:08 PM EDTAreal Flood AdvisoryPHICarbon86 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.