Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 42, NWS Philadelphia/Mount Holly

June 12, 2015Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 12, 2015, 7:27 PM EDT for Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 33 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
Jun 12, 2015, 7:27 PM EDT (23:27 UTC)
Expired
Jun 12, 2015, 8:00 PM EDT
In force
33 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Warren County, NJ, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 23:30 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
Jun 12, 7:33 PM EDTHAIL 0.25Forks Twp, 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 12:00Z, 11.5 hours before the alert went out and 187 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 12:00Z on 2015-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Brookhaven, NY at 12:00Z on 2015-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2083 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
67 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.

947 
WUUS51 KPHI 122327
SVRPHI
NJC041-PAC095-130000-
/O.NEW.KPHI.SV.W.0042.150612T2327Z-150613T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
727 PM EDT FRI JUN 12 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN WARREN COUNTY IN NORTHWESTERN NEW JERSEY...
  SOUTHEASTERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 800 PM EDT

* AT 726 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED OVER HARMONY...OR OVER EASTON...AND MOVING NORTHEAST AT
  30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  EASTON...FORKS...WILSON...WASHINGTON...NAZARETH...BELVIDERE...
  HARMONY...OXFORD...ALPHA...HOPE...BELFAST...WEST EASTON...TATAMY...
  GLENDON...PLEASANT VALLEY...ROXBURG...BRASS CASTLE...OLD ORCHARD...
  GREAT MEADOWS-VIENNA AND PHILLIPSBURG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4096 7493 4078 7489 4061 7519 4060 7523
      4075 7532
TIME...MOT...LOC 2326Z 245DEG 42KT 4071 7517 

$$
JJM
1 follow-up statement
137 
WWUS51 KPHI 122351
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
751 PM EDT FRI JUN 12 2015

PAC095-130000-
/O.CAN.KPHI.SV.W.0042.000000T0000Z-150613T0000Z/
NORTHAMPTON PA-
751 PM EDT FRI JUN 12 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NORTHAMPTON
COUNTY IS CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4096 7493 4078 7489 4068 7506 4075 7509
      4087 7504
TIME...MOT...LOC 2350Z 240DEG 33KT 4084 7495 

$$

NJC041-130000-
/O.CON.KPHI.SV.W.0042.000000T0000Z-150613T0000Z/
WARREN NJ-
751 PM EDT FRI JUN 12 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL WARREN COUNTY...

AT 750 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED OVER OXFORD...OR 17 MILES NORTHEAST OF EASTON...MOVING
NORTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
WASHINGTON...OXFORD...HOPE...PLEASANT VALLEY...BRASS CASTLE AND GREAT
MEADOWS-VIENNA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

&&

LAT...LON 4096 7493 4078 7489 4068 7506 4075 7509
      4087 7504
TIME...MOT...LOC 2350Z 240DEG 33KT 4084 7495 

$$

JJM

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 8:57 PM EDTSpecial Weather StatementPHISchuylkill48 min
Jun 11, 9:23 PM EDTSpecial Weather StatementPHILehigh, Northampton52 min
Jun 11, 9:33 PM EDTSpecial Weather StatementPHIBerks27 min
Jun 11, 9:41 PM EDTAreal Flood AdvisoryPHILehigh, Northampton4 hr
Jun 11, 9:54 PM EDTSpecial Weather StatementPHIBerks51 min
Jun 12, 4:38 PM EDTSpecial Weather StatementPHIMontgomery52 min
Jun 12, 4:57 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery48 min
Jun 12, 5:07 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton38 min
Jun 12, 5:41 PM EDTSevere Thunderstorm WarningPHINorthampton49 min
Jun 12, 6:13 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton28 min
Jun 12, 6:53 PM EDTSevere Thunderstorm WarningPHILehigh, Northampton52 min
Jun 12, 2:26 PM EDTSpecial Weather StatementPHIMorris34 min
Jun 12, 3:05 PM EDTSpecial Weather StatementPHIMorris55 min
Jun 12, 3:13 PM EDTSevere Thunderstorm WarningPHIMorris, Somerset37 min
Jun 12, 6:23 PM EDTSevere Thunderstorm WarningPHISussex, Warren67 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015Severe Thunderstorm Warnings in New Jersey, 2015Every severe thunderstorm warning in 2015

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.