Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 46, NWS Philadelphia/Mount Holly

June 14, 2015Berks County, Chester County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 14, 2015, 7:16 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 44 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 14, 2015, 7:16 PM EDT (23:16 UTC)
Expired
Jun 14, 2015, 8:00 PM EDT
In force
44 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 23:18 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 14, 7:50 PM EDTTSTM WND DMGFranconia Twp, PASEVERAL TREES DOWN AND A MAILBOX BLOWN INTO NEIGHBORS DRIVEWAY

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.3 hours before the alert went out and 207 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 2015-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 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 2015-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 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
24 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
1394 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-19 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

889 
WUUS51 KPHI 142316
SVRPHI
PAC011-029-091-150000-
/O.NEW.KPHI.SV.W.0046.150614T2316Z-150615T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
716 PM EDT SUN JUN 14 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 800 PM EDT

* AT 715 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THIS STORM WAS LOCATED OVER ELVERSON...OR 11 MILES
  SOUTHEAST OF READING...AND MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  READING...POTTSTOWN...PHOENIXVILLE...LANSDALE...SOUDERTON...
  BIRDSBORO...COLLEGEVILLE...ROYERSFORD...TRAPPE...HATFIELD...EAST
  GREENVILLE...SCHWENKSVILLE...ELVERSON...BALLY...BECHTELSVILLE...
  GREEN LANE...NEW MORGAN...CEDARVILLE...SPRING MOUNT AND
  GILBERTSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY 
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE INDOORS. 
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE 
WATER COVERS THE ROAD.

&&

LAT...LON 4051 7564 4027 7525 4004 7574 4018 7574
      4015 7589 4024 7603
TIME...MOT...LOC 2315Z 233DEG 19KT 4019 7582 

$$

IOVINO
1 follow-up statement
473 
WWUS51 KPHI 142331
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
731 PM EDT SUN JUN 14 2015

PAC011-029-091-150000-
/O.CON.KPHI.SV.W.0046.000000T0000Z-150615T0000Z/
CHESTER PA-BERKS PA-MONTGOMERY PA-
731 PM EDT SUN JUN 14 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHEASTERN CHESTER...SOUTHEASTERN BERKS AND NORTHWESTERN
MONTGOMERY COUNTIES...

AT 731 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 
MPH. THIS STORM WAS LOCATED NEAR CEDARVILLE...MOVING NORTHEAST AT 20 
MPH.

LOCATIONS IMPACTED INCLUDE...
POTTSTOWN...PHOENIXVILLE...LANSDALE...SOUDERTON...BIRDSBORO...
COLLEGEVILLE...ROYERSFORD...TRAPPE...HATFIELD...EAST GREENVILLE...
SCHWENKSVILLE...BALLY...BECHTELSVILLE...GREEN LANE...CEDARVILLE...
CHESTER SPRINGS...SPRING MOUNT...GILBERTSVILLE...PUGHTOWN AND
SKIPPACK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY 
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE INDOORS. 
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE 
WATER COVERS THE ROAD.

&&

LAT...LON 4051 7564 4027 7525 4008 7564 4018 7574
      4032 7590
TIME...MOT...LOC 2331Z 239DEG 18KT 4021 7573 

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 4:11 PM EDTSevere Thunderstorm WarningPHIChester38 min
Jun 14, 4:40 PM EDTAreal Flood AdvisoryPHIChester3 hr
Jun 14, 6:24 PM EDTSpecial Weather StatementPHIBerks, Chester51 min
Jun 14, 6:35 PM EDTSevere Thunderstorm WarningPHIBerks, Chester55 min
Jun 14, 6:45 PM EDTAreal Flood AdvisoryPHICarbon, Monroe4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 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.