Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 78, NWS Philadelphia/Mount Holly

July 7, 20125 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 7, 2012, 5:07 PM EDT for 5 counties in Pennsylvania. It was in force for 53 min. 6 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 7, 2012, 5:07 PM EDT (21:07 UTC)
Expired
Jul 7, 2012, 6:00 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 21:09 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 7, 5:25 PM EDTTSTM WND DMGBeaver Meadows, PANUMEROUS TREES DOWN IN CARBON COUNTY FROM AROUND BEAVER MEADOWS TO AROUND BOWMANSTOWN.
Jul 7, 5:45 PM EDTTSTM WND DMGSlatington, PADOWNED TREES
Jul 7, 5:45 PM EDTTSTM WND DMGWalnutport, PALARGE LIMBS DOWN.
Jul 7, 5:55 PM EDTTSTM WND DMGAllentown, PASEPARATE REPORT... LARGE TREE LIMBS DOWN.
Jul 7, 5:56 PM EDTTSTM WND GST 50Allentown Airport, PA
Jul 7, 6:00 PM EDTTSTM WND GST 68Allentown, PA

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 7, 11:41 AM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 236 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, Washington/Dulle, VA at 12:00Z on 2012-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1804 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, Washington/Dulle, VA at 12:00Z on 2012-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
1804 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

147 
WUUS51 KPHI 072107
SVRPHI
PAC011-025-077-089-095-072200-
/O.NEW.KPHI.SV.W.0078.120707T2107Z-120707T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
507 PM EDT SAT JUL 7 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF READING...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  SOUTHWESTERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 600 PM EDT

* AT 504 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM 17 MILES NORTHWEST OF WEATHERLY
  TO 20 MILES WEST OF WEATHERLY TO 27 MILES NORTHWEST OF STRAUSSTOWN
  TO 42 MILES NORTHWEST OF STRAUSSTOWN TO 57 MILES NORTHWEST OF   
  STRAUSSTOWN...AND MOVING SOUTHEAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WEATHERLY AND NESQUEHONING AROUND 525 PM EDT...
  CHRISTMANS...NEW MAHONING AND JIM THORPE AROUND 530 PM EDT...
  PENN FOREST RESERVOIR...WANAMAKERS...BELTZVILLE STATE PARK AND
  LEHIGHTON AROUND 535 PM EDT...
  NEW TRIPOLI AROUND 540 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 700 PM EDT
SATURDAY EVENING FOR NORTHERN NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4058 7602 4065 7599 4074 7577 4091 7600
      4101 7575 4108 7578 4112 7572 4105 7557
      4068 7518 4060 7522 4050 7540 4042 7548
      4044 7553 4037 7559 4028 7593 4029 7613
      4049 7643
TIME...MOT...LOC 2107Z 311DEG 45KT 4113 7597 4091 7616
          4081 7641 4084 7678 4086 7710

$$

HAYES
1 follow-up statement
088 
WWUS51 KPHI 072125
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
525 PM EDT SAT JUL 7 2012

PAC011-025-077-089-095-072200-
/O.CON.KPHI.SV.W.0078.000000T0000Z-120707T2200Z/
BERKS PA-LEHIGH PA-MONROE PA-CARBON PA-NORTHAMPTON PA-
525 PM EDT SAT JUL 7 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR SOUTHERN NORTHAMPTON...CARBON...SOUTHWESTERN MONROE...LEHIGH AND
BERKS COUNTIES...

AT 521 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS 
WERE LOCATED ALONG A LINE EXTENDING FROM WEATHERLY TO 43 MILES 
NORTHWEST OF STRAUSSTOWN...MOVING SOUTHEAST AT 40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  CHRISTMANS...NEW MAHONING AND JIM THORPE BY 530 PM EDT...
  PENN FOREST RESERVOIR...WANAMAKERS...BELTZVILLE STATE PARK AND
  WEISSPORT EAST BY 535 PM EDT...
  NEW TRIPOLI...JORDAN VALLEY AND EMERALD BY 540 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 700 PM EDT
SATURDAY EVENING FOR NORTHERN NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4050 7641 4058 7602 4065 7599 4074 7577
      4091 7600 4101 7574 4108 7578 4112 7572
      4105 7557 4068 7518 4060 7522 4050 7540
      4042 7548 4044 7553 4037 7559 4028 7593
      4029 7612 4048 7643
TIME...MOT...LOC 2125Z 311DEG 45KT 4097 7575 4075 7595
          4065 7620 4069 7657 4071 7689

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 4:49 PM EDTSpecial Weather StatementPHIBerks, Carbon, Lehigh, Northampton86 min
Jul 7, 5:57 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Delaware, Lehigh, Montgomery and 2 more63 min
Jul 7, 6:58 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery48 min

Nearby

Severe 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.