Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 56, NWS Philadelphia/Mount Holly

June 25, 2014Berks County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 25, 2014, 8:10 PM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 50 min. 5 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: Jun 25, 2014, 8:10 PM EDT (00:10 UTC)
Expired: Jun 25, 2014, 9:00 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 00:13 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

Time	Report	Where	Remark
Jun 25, 8:10 PM EDT	TSTM WND DMG	Heidelberg Twp, PA	NUMEROUS TREES AND WIRES DOWN IN HEIDELBERG... LYNN... LOWHILL AND NORTH WHITEHALL.
Jun 25, 8:12 PM EDT	TSTM WND DMG	Heidelberg Twp, PA	TREES AND WIRES DOWN IN HEIDELBERG
Jun 25, 8:20 PM EDT	TSTM WND DMG	Lowhill Twp, PA	TREES DOWN
Jun 25, 8:23 PM EDT	TSTM WND DMG	North Whitehall Twp, PA	TREES DOWN
Jun 25, 8:35 PM EDT	HAIL 1	Orefield, PA

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.2 hours before the alert went out and 234 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 146 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

382 
WUUS51 KPHI 260010
SVRPHI
PAC011-077-095-260100-
/O.NEW.KPHI.SV.W.0056.140626T0010Z-140626T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
810 PM EDT WED JUN 25 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  SOUTHWESTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 900 PM EDT

* AT 809 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  NEFFS TO KUTZTOWN...MOVING EAST AT 25 MPH. THESE STORMS ARE CAPABLE
  OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  SCHNECKSVILLE AND TOPTON AROUND 815 PM EDT...
  COFFEETOWN AROUND 820 PM EDT...
  NORTHAMPTON AND ANCIENT OAKS AROUND 830 PM EDT...
  EMMAUS AND ALLENTOWN AROUND 840 PM EDT...
  STEUBEN AND ZIONSVILLE AROUND 845 PM EDT...
  BETHLEHEM AND LEHIGH UNIVERSITY AROUND 850 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO A
STURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DO
SO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THE
NATIONAL WEATHER SERVICE.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY CAN
RELAY THE REPORTS TO THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY.

&&

LAT...LON 4071 7577 4074 7566 4072 7527 4056 7532
      4042 7548 4044 7553 4042 7555 4041 7557
      4050 7577 4054 7579 4055 7580
TIME...MOT...LOC 0010Z 287DEG 20KT 4071 7564 4055 7573

$$

JRK

3 follow-up statements

814 
WWUS51 KPHI 260026
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
826 PM EDT WED JUN 25 2014

PAC011-077-095-260100-
/O.CON.KPHI.SV.W.0056.000000T0000Z-140626T0100Z/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
826 PM EDT WED JUN 25 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTH CENTRAL NORTHAMPTON...LEHIGH AND EAST CENTRAL BERKS
COUNTIES...

AT 823 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 SCHNECKSVILLE TO TOPTON...OR 
ALONG A LINE EXTENDING FROM 8 MILES NORTHWEST OF ALLENTOWN TO 10 
MILES SOUTHWEST OF ALLENTOWN...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ANCIENT OAKS AND ALBURTIS BY 835 PM EDT...
  COPLAY...NORTHAMPTON...AND ANCIENT OAKS BY 840 PM EDT...
  NORTH CATASAUQUA...MACUNGIE AND FULLERTON BY 845 PM EDT...
  CATASAUQUA BY 850 PM EDT...

IN ADDITION TO LARGE HAIL AND 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 4057 7576 4067 7568 4069 7562 4067 7528
      4056 7532 4042 7548 4044 7553 4042 7555
      4041 7557 4050 7577
TIME...MOT...LOC 0025Z 291DEG 13KT 4069 7556 4053 7565

$$

JRK

953 
WWUS51 KPHI 260042
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
842 PM EDT WED JUN 25 2014

PAC011-077-095-260100-
/O.CON.KPHI.SV.W.0056.000000T0000Z-140626T0100Z/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
842 PM EDT WED JUN 25 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTH CENTRAL NORTHAMPTON...SOUTHEASTERN LEHIGH AND EAST CENTRAL
BERKS COUNTIES...

AT 841 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE 
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM FULLERTON TO EMMAUS TO 
ALBURTIS...OR ALONG A LINE EXTENDING FROM ALLENTOWN TO 12 MILES 
SOUTHWEST OF ALLENTOWN...MOVING EAST AT 15 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ALBURTIS AND ALLENTOWN BY 850 PM EDT...
  MACUNGIE AND EMMAUS BY 855 PM EDT...
  FOUNTAIN HILL...LEHIGH UNIVERSITY...BETHLEHEM AND ZIONSVILLE BY 900
  PM EDT...

IN ADDITION TO LARGE HAIL AND 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 4061 7562 4065 7551 4063 7529 4056 7532
      4044 7546 4043 7549 4044 7553 4041 7556
      4042 7559 4052 7571
TIME...MOT...LOC 0042Z 291DEG 13KT 4064 7549 4057 7553
          4050 7567

$$

JRK

885 
WWUS51 KPHI 260057
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
857 PM EDT WED JUN 25 2014

PAC011-077-095-260107-
/O.EXP.KPHI.SV.W.0056.000000T0000Z-140626T0100Z/
BERKS PA-LEHIGH PA-NORTHAMPTON PA-
857 PM EDT WED JUN 25 2014

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NORTHAMPTON...
SOUTHEASTERN LEHIGH AND EAST CENTRAL BERKS COUNTIES WILL EXPIRE AT
900 PM EDT...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND THUS HAS 
BEEN ALLOWED TO EXPIRE.

LAT...LON 4061 7562 4065 7551 4063 7529 4056 7532
      4044 7546 4043 7549 4044 7553 4041 7556
      4042 7559 4052 7571
TIME...MOT...LOC 0057Z 291DEG 13KT 4062 7542 4055 7546
          4048 7560

$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 8:15 PM EDT	Special Weather Statement	PHI	Berks	60 min
Jun 25, 8:29 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Jun 25, 8:59 PM EDT	Special Weather Statement	PHI	Bucks	46 min
Jun 25, 9:12 PM EDT	Special Weather Statement	PHI	Berks	48 min
Jun 25, 10:17 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Every 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.