Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 140, NWS Philadelphia/Mount Holly

July 28, 20125 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 28, 2012, 6:57 PM EDT for 5 counties in Pennsylvania. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 28, 2012, 6:57 PM EDT (22:57 UTC)
Expired
Jul 28, 2012, 8:00 PM EDT
In force
63 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), 141 km from the middle of the area, began a volume at 22:57 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.

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

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.0 hours before the alert went out and 226 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 2012-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 552 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, Washington/Dulle, VA at 12:00Z on 2012-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
552 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
1087 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
8 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

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

079 
WUUS51 KPHI 282257
SVRPHI
PAC011-025-077-089-095-290000-
/O.NEW.KPHI.SV.W.0140.120728T2257Z-120729T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
657 PM EDT SAT JUL 28 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...
  WESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHEASTERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  SOUTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 800 PM EDT

* AT 653 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 JIM THORPE TO SHOEMAKERSVILLE
  TO WOMELSDORF TO 18 MILES SOUTHWEST OF WOMELSDORF...OR ALONG A LINE
  EXTENDING FROM LEHIGHTON TO 13 MILES NORTHWEST OF READING TO 12
  MILES WEST OF READING TO 11 MILES NORTHWEST OF LANCASTER...AND
  MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BELTZVILLE STATE PARK AROUND 705 PM EDT...
  BELTZVILLE STATE PARK...SHOEMAKERSVILLE AND LENHARTSVILLE AROUND
  710 PM EDT...
  PENN FOREST RESERVOIR...NEW TRIPOLI...JORDAN VALLEY AND LEESPORT
  AROUND 715 PM EDT...
  JORDAN VALLEY AND WERNERSVILLE AROUND 720 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 4057 7609 4059 7602 4065 7599 4074 7577
      4080 7586 4092 7574 4098 7513 4097 7512
      4045 7562 4017 7593 4017 7594 4036 7621
      4039 7628
TIME...MOT...LOC 2257Z 257DEG 16KT 4087 7565 4050 7602
          4036 7614 4017 7639

$$

HAYES
2 follow-up statements
378 
WWUS51 KPHI 282320
SVSPHI

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

PAC089-282331-
/O.CAN.KPHI.SV.W.0140.000000T0000Z-120729T0000Z/
MONROE PA-
720 PM EDT SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MONROE COUNTY 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 4057 7609 4059 7602 4065 7599 4074 7577
      4077 7583 4084 7570 4085 7549 4081 7547
      4085 7531 4081 7527 4045 7562 4017 7593
      4036 7621 4039 7628
TIME...MOT...LOC 2321Z 257DEG 16KT 4089 7551 4052 7588
          4038 7600 4019 7625

$$

PAC011-025-077-095-290000-
/O.CON.KPHI.SV.W.0140.000000T0000Z-120729T0000Z/
BERKS PA-LEHIGH PA-CARBON PA-NORTHAMPTON PA-
720 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR WESTERN NORTHAMPTON...SOUTHEASTERN CARBON...LEHIGH AND BERKS
COUNTIES...

AT 718 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 8 MILES NORTHEAST OF
PALMERTON TO LENHARTSVILLE TO WHITFIELD TO 13 MILES SOUTH OF
WOMELSDORF...OR ALONG A LINE EXTENDING FROM 11 MILES EAST OF
LEHIGHTON TO 13 MILES NORTH OF READING TO 6 MILES NORTHWEST OF
READING TO 10 MILES NORTH OF LANCASTER...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  WALNUTPORT AND SLATINGTON BY 730 PM EDT...
  WHITFIELD...TEMPLE AND SINKING SPRING BY 735 PM EDT...
  NEFFS...WYOMISSING HILLS...WEST WYOMISSING AND WEST LAWN BY 740 PM
  EDT...
  WYOMISSING BY 745 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 4057 7609 4059 7602 4065 7599 4074 7577
      4077 7583 4084 7570 4085 7549 4081 7547
      4085 7531 4081 7527 4045 7562 4017 7593
      4036 7621 4039 7628
TIME...MOT...LOC 2321Z 257DEG 16KT 4089 7551 4052 7588
          4038 7600 4019 7625

$$

HAYES
414 
WWUS51 KPHI 282342
SVSPHI

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

PAC011-025-077-095-290000-
/O.CON.KPHI.SV.W.0140.000000T0000Z-120729T0000Z/
BERKS PA-LEHIGH PA-CARBON PA-NORTHAMPTON PA-
742 PM EDT SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR WESTERN NORTHAMPTON...SOUTHEASTERN CARBON...LEHIGH AND EASTERN
BERKS COUNTIES...

AT 740 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
WALNUTPORT TO KUTZTOWN TO LAURELDALE TO 9 MILES SOUTH OF
WERNERSVILLE...OR ALONG A LINE EXTENDING FROM 10 MILES EAST OF
LEHIGHTON TO 16 MILES WEST OF ALLENTOWN TO READING TO 14 MILES
SOUTHWEST OF READING...MOVING EAST AT 20 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  CLAUSSVILLE...SHILLINGTON...READING AND MOHNTON BY 750 PM EDT...
  TOPTON...COFFEETOWN...LYONS AND KENHORST BY 755 PM EDT...
  MOUNT PENN AND BEERSVILLE BY 800 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 4037 7608 4048 7605 4071 7583 4074 7577
      4075 7579 4077 7578 4078 7582 4084 7570
      4085 7549 4081 7547 4085 7531 4081 7527
      4045 7562 4017 7593 4029 7609
TIME...MOT...LOC 2342Z 257DEG 16KT 4078 7554 4054 7576
          4040 7588 4021 7613

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 11:38 AM EDTSpecial Weather StatementPHIBucks52 min
Jul 28, 12:27 PM EDTSpecial Weather StatementPHIMonroe63 min
Jul 28, 12:58 PM EDTAreal Flood AdvisoryPHIMonroe2 hr
Jul 28, 1:46 PM EDTSpecial Weather StatementPHIPhiladelphia59 min
Jul 28, 2:18 PM EDTAreal Flood AdvisoryPHIBucks, Philadelphia3 hr
Jul 28, 2:18 PM EDTSpecial Weather StatementPHIMonroe57 min
Jul 28, 2:33 PM EDTSpecial Weather StatementPHIChester57 min
Jul 28, 3:33 PM EDTAreal Flood AdvisoryPHINorthampton81 min
Jul 28, 3:41 PM EDTSpecial Weather StatementPHICarbon, Monroe64 min
Jul 28, 4:47 PM EDTFlash Flood WarningPHINorthampton4 hr
Jul 28, 5:01 PM EDTAreal Flood AdvisoryPHIMonroe3 hr
Jul 28, 5:06 PM EDTSpecial Weather StatementPHIDelaware, Philadelphia54 min
Jul 28, 5:14 PM EDTSpecial Weather StatementPHINorthampton61 min
Jul 28, 5:16 PM EDTSpecial Weather StatementPHIMonroe59 min
Jul 28, 5:38 PM EDTSpecial Weather StatementPHICarbon67 min
Jul 28, 5:40 PM EDTAreal Flood AdvisoryPHICarbon, Monroe3 hr
Jul 28, 5:45 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe60 min
Jul 28, 5:56 PM EDTAreal Flood AdvisoryPHILehigh, Northampton3 hr
Jul 28, 6:03 PM EDTSpecial Weather StatementPHINorthampton57 min
Jul 28, 6:28 PM EDTSpecial Weather StatementPHIBerks, Lehigh, Northampton62 min
Jul 28, 6:40 PM EDTSpecial Weather StatementPHIBucks65 min
Jul 28, 6:45 PM EDTSpecial Weather StatementPHICarbon, Lehigh, Monroe, Northampton60 min
Jul 28, 7:01 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh116 min
Jul 28, 7:37 PM EDTSpecial Weather StatementPHIChester53 min
Jul 28, 7:40 PM EDTSpecial Weather StatementPHINorthampton65 min
Jul 28, 7:43 PM EDTSpecial Weather StatementPHIMonroe62 min
Jul 28, 7:56 PM EDTSpecial Weather StatementPHIBucks64 min
Jul 28, 7:57 PM EDTSevere Thunderstorm WarningPHIChester48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.