Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 45, NWS Philadelphia/Mount Holly

June 14, 2015Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 14, 2015, 6:35 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 55 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
Jun 14, 2015, 6:35 PM EDT (22:35 UTC)
Expired
Jun 14, 2015, 7:30 PM EDT
In force
55 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 22:35 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.6 hours before the alert went out and 168 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.

806 
WUUS51 KPHI 142235
SVRPHI
PAC011-029-142330-
/O.NEW.KPHI.SV.W.0045.150614T2235Z-150614T2330Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHERN BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 730 PM EDT

* AT 634 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 GAP...OR 9 MILES SOUTH OF
  NEW HOLLAND...AND MOVING EAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  COATESVILLE...DOWNINGTOWN...KENNETT SQUARE...PARKESBURG...WEST
  GROVE...HONEY BROOK...ELVERSON...NEW MORGAN...HOMEVILLE...
  COCHRANVILLE...GLENMOORE...CEDARVILLE...MOUNT VERNON...ATGLEN...
  SOUTH COATESVILLE...AVONDALE...CHRISTIANA...MODENA...THORNDALE AND
  TOUGHKENAMON.

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 3983 7602 3985 7602 3987 7599 3992 7600
      3994 7598 3995 7600 4004 7593 4011 7594
      4014 7588 4019 7595 4023 7567 3981 7570
      3981 7603 3983 7604
TIME...MOT...LOC 2234Z 271DEG 14KT 3997 7602 

$$

IOVINO
1 follow-up statement
148 
WWUS51 KPHI 142301
SVSPHI

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

PAC011-029-142330-
/O.CON.KPHI.SV.W.0045.000000T0000Z-150614T2330Z/
CHESTER PA-BERKS PA-
701 PM EDT SUN JUN 14 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR CENTRAL CHESTER AND SOUTHERN BERKS COUNTIES...

AT 700 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 HONEY BROOK AND IT WAS MOVING EAST 
AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
COATESVILLE...DOWNINGTOWN...KENNETT SQUARE...PARKESBURG...HONEY
BROOK...ELVERSON...NEW MORGAN...COCHRANVILLE...GLENMOORE...
CEDARVILLE...ATGLEN...SOUTH COATESVILLE...CHRISTIANA...MODENA AND
THORNDALE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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 3992 7600 3994 7598 3995 7600 4004 7593
      4011 7594 4014 7588 4019 7595 4023 7567
      3985 7570 3987 7599
TIME...MOT...LOC 2300Z 258DEG 13KT 4008 7586 

$$

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, 6:45 PM EDTAreal Flood AdvisoryPHICarbon, Monroe4 hr
Jun 14, 7:16 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Montgomery44 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.