Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 142, NWS Philadelphia/Mount Holly

July 23, 20145 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2014, 5:17 PM EDT for 5 counties in Pennsylvania. It was in force for 58 min. 1 report 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 23, 2014, 5:17 PM EDT (21:17 UTC)
Expired
Jul 23, 2014, 6:15 PM EDT
In force
58 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 21:20 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 23, 5:20 PM EDTTSTM WND DMGGreenwich Twp, PASEVERAL TREES 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, 9.3 hours before the alert went out and 127 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 2014-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 697 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 2014-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
697 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
737 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
32 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.

794 
WUUS51 KPHI 232117
SVRPHI
PAC011-017-077-091-095-232215-
/O.NEW.KPHI.SV.W.0142.140723T2117Z-140723T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
517 PM EDT WED JUL 23 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  WEST CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 615 PM EDT

* AT 516 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR LENHARTSVILLE...MOVING EAST
  AT 20 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEW TRIPOLI AROUND 525 PM EDT...
  KUTZTOWN AND FLEETWOOD AROUND 530 PM EDT...
  LYONS AROUND 535 PM EDT...
  CLAUSSVILLE AROUND 540 PM EDT...
  TOPTON AND SCHNECKSVILLE AROUND 545 PM EDT...
  COFFEETOWN AROUND 550 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE WINDS OF MORE THAN 57 MPH...OR HAIL ONE
INCH OR LARGER.

&&

LAT...LON 4068 7591 4070 7587 4068 7529 4025 7546
      4050 7601
TIME...MOT...LOC 2117Z 288DEG 18KT 4056 7586

$$

FORECASTER:SFJ
2 follow-up statements
441 
WWUS51 KPHI 232132
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
532 PM EDT WED JUL 23 2014

PAC011-017-077-091-095-232215-
/O.CON.KPHI.SV.W.0142.000000T0000Z-140723T2215Z/
BERKS PA-BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-
532 PM EDT WED JUL 23 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTH CENTRAL NORTHAMPTON...NORTHWESTERN MONTGOMERY...LEHIGH...
WEST CENTRAL BUCKS AND NORTHEASTERN BERKS COUNTIES...

AT 530 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR KUTZTOWN...OR 16 MILES
NORTH OF READING...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTH OF FLEETWOOD BY 535 PM EDT...
  KUTZTOWN BY 540 PM EDT...
  LYONS BY 550 PM EDT...
  TOPTON AND 7 MILES SOUTH OF CLAUSSVILLE BY 555 PM EDT...
  ALBURTIS...ANCIENT OAKS...MACUNGIE AND 6 MILES WEST OF ZIONSVILLE
  BY 615 PM EDT...

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.

LAT...LON 4048 7597 4070 7583 4068 7529 4025 7546
TIME...MOT...LOC 2132Z 288DEG 13KT 4055 7581

$$

SFJ
650 
WWUS51 KPHI 232155
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
555 PM EDT WED JUL 23 2014

PAC011-017-077-091-095-232215-
/O.CON.KPHI.SV.W.0142.000000T0000Z-140723T2215Z/
BERKS PA-BUCKS PA-LEHIGH PA-MONTGOMERY PA-NORTHAMPTON PA-
555 PM EDT WED JUL 23 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTH CENTRAL NORTHAMPTON...NORTHWESTERN MONTGOMERY...LEHIGH...
WEST CENTRAL BUCKS AND NORTHEASTERN BERKS COUNTIES...

AT 552 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR TOPTON...OR 13 MILES
WEST OF ALLENTOWN...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TOPTON BY 600 PM EDT...
  ALBURTIS...ANCIENT OAKS...MACUNGIE AND 6 MILES WEST OF ZIONSVILLE
  BY 615 PM EDT...

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.

LAT...LON 4048 7597 4070 7574 4068 7529 4025 7546
TIME...MOT...LOC 2155Z 288DEG 13KT 4052 7571

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 4:33 PM EDTSpecial Weather StatementPHICarbon, Monroe57 min
Jul 23, 4:42 PM EDTSpecial Weather StatementPHIBerks, Lehigh48 min
Jul 23, 5:25 PM EDTSpecial Weather StatementPHIMonroe50 min
Jul 23, 6:14 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Chester, Lehigh, Montgomery, Northampton61 min
Jul 23, 7:09 PM EDTSpecial Weather StatementPHIBucks, Chester, Delaware, Montgomery, Philadelphia51 min
Jul 23, 7:25 PM EDTSpecial Weather StatementPHICarbon, Lehigh, Monroe, Northampton65 min
Jul 23, 7:49 PM EDTSevere Thunderstorm WarningPHICarbon, Lehigh, Monroe, Northampton38 min
Jul 23, 7:59 PM EDTSpecial Weather StatementPHIDelaware, Philadelphia61 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014Every severe thunderstorm warning in 2014

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.