Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 70, NWS Philadelphia/Mount Holly

July 19, 2013Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 19, 2013, 8:33 PM EDT for Berks County, Pennsylvania. It was in force for 42 min. 4 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
Jul 19, 2013, 8:33 PM EDT (00:33 UTC)
Expired
Jul 19, 2013, 9:15 PM EDT
In force
42 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 136 km from the middle of the area, began a volume at 00:34 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 19, 8:40 PM EDTTSTM WND DMGSpring Twp, PASOME TREES DOWN IN SPRING TOWNSHIP.
Jul 19, 8:45 PM EDTTSTM WND DMG2 Wsw Flying Hills, PASOME TREES DOWN IN CUMRU TOWNSHIP.
Jul 19, 8:50 PM EDTTSTM WND DMGSaint Lawrence, PATREE ONTO WIRES IN SAINT LAWRENCE.
Jul 19, 9:10 PM EDTHAIL 0.5Fleetwood, PAHALF INCH HAIL REPORTED IN FLEETWOOD. REPORT RELAYED BY EPAWA.

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 00:00Z, 0.6 hours before the alert went out and 204 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 00:00Z on 2013-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3898 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 00:00Z on 2013-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 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
3898 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1191 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
68 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.

473 
WUUS51 KPHI 200033
SVRPHI
PAC011-200115-
/O.NEW.KPHI.SV.W.0070.130720T0033Z-130720T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
833 PM EDT FRI JUL 19 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 915 PM EDT

* AT 830 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR DENVER...MOVING NORTHEAST
  AT 25 MPH. THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WERNERSVILLE AROUND 840 PM EDT...
  SINKING SPRING AROUND 845 PM EDT...
  WYOMISSING AND FAIRVIEW HGTS AROUND 850 PM EDT...
  READING AND LEESPORT AROUND 855 PM EDT...
  LAURELDALE AND LEESPORT AROUND 900 PM EDT...
  BIRDSBORO AROUND 905 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS SEVERE
THUNDERSTORM. WHEN THUNDER ROARS...MOVE INDOORS! REMEMBER...IF YOU
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 4054 7585 4029 7566 4021 7599 4033 7618
TIME...MOT...LOC 0033Z 244DEG 22KT 4028 7609

$$

ROBERTSON
1 follow-up statement
243 
WWUS51 KPHI 200052
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
852 PM EDT FRI JUL 19 2013

PAC011-200115-
/O.CON.KPHI.SV.W.0070.000000T0000Z-130720T0115Z/
BERKS PA-
852 PM EDT FRI JUL 19 2013

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR EASTERN BERKS COUNTY...

AT 849 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 LAURELDALE TO FLYING HILLS...
MOVING EAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
BIRDSBORO AROUND 900 PM EDT...
AMITY GARDENS AROUND 905 PM EDT...
FLEETWOOD AROUND 910 PM EDT...

LAT...LON 4024 7593 4036 7608 4054 7585 4029 7566
TIME...MOT...LOC 0052Z 248DEG 26KT 4040 7595 4028 7588

$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 8:24 PM EDTSpecial Weather StatementPHIBerks36 min
Jul 19, 9:01 PM EDTSpecial Weather StatementPHIChester29 min
Jul 19, 9:07 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Northampton38 min
Jul 19, 9:41 PM EDTSpecial Weather StatementPHINorthampton34 min
Jul 20, 2:39 PM EDTSpecial Weather StatementPHIMonroe51 min
Jul 20, 3:31 PM EDTSpecial Weather StatementPHIMonroe59 min
Jul 20, 5:13 PM EDTSpecial Weather StatementPHILehigh62 min
Jul 20, 7:16 PM EDTSevere Thunderstorm WarningPHIBucks, Northampton59 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013Every severe thunderstorm warning in 2013

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.