Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 82, NWS Philadelphia/Mount Holly

July 13, 2017Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 13, 2017, 4:15 PM EDT for Berks County, Pennsylvania. It was in force for 60 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
Jul 13, 2017, 4:15 PM EDT (20:15 UTC)
Expired
Jul 13, 2017, 5:15 PM EDT
In force
60 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Berks County, PA

The radar

The State College radar (KCCX), 161 km from the middle of the area, began a volume at 20:18 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 13, 2:57 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.3 hours before the alert went out and 198 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 2017-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 135 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2017-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
135 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1715 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

349 
WUUS51 KPHI 132015
SVRPHI
PAC011-132115-
/O.NEW.KPHI.SV.W.0082.170713T2015Z-170713T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
415 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Western Berks County in eastern Pennsylvania...

* Until 515 PM EDT

* At 414 PM EDT, a severe thunderstorm was located near Lickdale, or
  11 miles north of Annville, moving east at 30 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* This severe thunderstorm will be near,
  Newmanstown and Strausstown around 450 PM EDT. 
  Womelsdorf around 455 PM EDT. 
  Robesonia and Bernville around 500 PM EDT. 
  Wernersville around 505 PM EDT. 
  Sinking Spring and Fairview Hgts around 510 PM EDT. 
  Leesport and Spring Ridge around 515 PM EDT. 

Other locations impacted by this severe thunderstorm include
Whitfield, Centerport, West Lawn and West Wyomissing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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.

Torrential rainfall is occurring with this storm, and may lead to 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4052 7634 4052 7625 4054 7617 4056 7613
      4057 7608 4055 7592 4024 7603 4031 7614
      4036 7621 4037 7623 4049 7643
TIME...MOT...LOC 2014Z 286DEG 26KT 4050 7653 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson
2 follow-up statements
449 
WWUS51 KPHI 132044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
444 PM EDT THU JUL 13 2017

PAC011-132115-
/O.CON.KPHI.SV.W.0082.000000T0000Z-170713T2115Z/
Berks PA-
444 PM EDT THU JUL 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR SOUTHWESTERN BERKS COUNTY...

At 442 PM EDT, a severe thunderstorm was located near Myerstown,
moving east at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

This severe storm will be near...
  Newmanstown and Strausstown around 450 PM EDT. 
  Womelsdorf around 455 PM EDT. 
  Robesonia and Bernville around 500 PM EDT. 
  Wernersville around 505 PM EDT. 
  Sinking Spring and Fairview Hgts around 510 PM EDT. 
  Leesport and Spring Ridge around 515 PM EDT. 

Other locations impacted by this severe thunderstorm include
Whitfield, Centerport and West Wyomissing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building.

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.

Torrential rainfall is occurring with this storm, and may lead to 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4043 7633 4052 7628 4052 7624 4048 7595
      4024 7603 4031 7614 4036 7621 4037 7623
TIME...MOT...LOC 2042Z 286DEG 26KT 4044 7627 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson
696 
WWUS51 KPHI 132059
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
459 PM EDT THU JUL 13 2017

PAC011-132115-
/O.CON.KPHI.SV.W.0082.000000T0000Z-170713T2115Z/
Berks PA-
459 PM EDT THU JUL 13 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR CENTRAL BERKS COUNTY...

At 459 PM EDT, a severe thunderstorm was located over Bernville, or
10 miles east of Myerstown, moving east at 30 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

This severe storm will be near...
  Robesonia around 505 PM EDT. 
  Sinking Spring and Fairview Hgts around 510 PM EDT. 
  Leesport and Spring Ridge around 515 PM EDT. 

Other locations impacted by this severe thunderstorm include
Whitfield, Centerport and West Wyomissing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building.

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.

Torrential rainfall is occurring with this storm, and may lead to 
localized flooding. Do not drive your vehicle through flooded 
roadways..

&&

LAT...LON 4039 7621 4051 7615 4048 7595 4027 7602
TIME...MOT...LOC 2059Z 286DEG 26KT 4041 7611 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 3:25 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton4 hr
Jul 13, 3:30 PM EDTSpecial Weather StatementPHILehigh, Northampton45 min
Jul 13, 4:06 PM EDTAreal Flood AdvisoryPHIBucks, Lehigh, Monroe, Northampton114 min
Jul 13, 4:06 PM EDTSpecial Weather StatementPHINorthampton39 min
Jul 13, 4:08 PM EDTSpecial Weather StatementPHISchuylkill37 min
Jul 13, 4:09 PM EDTSpecial Weather StatementPHIMontgomery36 min
Jul 13, 4:34 PM EDTSpecial Weather StatementPHIChester41 min
Jul 13, 4:36 PM EDTSpecial Weather StatementPHILehigh24 min
Jul 13, 4:42 PM EDTSpecial Weather StatementPHIMontgomery, Philadelphia48 min
Jul 13, 4:50 PM EDTAreal Flood AdvisoryPHIBerks, Bucks, Chester, Montgomery115 min
Jul 13, 4:50 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia40 min
Jul 13, 5:07 PM EDTAreal Flood AdvisoryPHIBucks, Delaware, Montgomery, Philadelphia7 hr
Jul 13, 5:08 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery35 min
Jul 13, 5:08 PM EDTTornado WarningPHIBerks22 min
Jul 13, 5:21 PM EDTSevere Thunderstorm WarningPHIBucks, Philadelphia54 min
Jul 13, 5:25 PM EDTFlash Flood WarningPHIBerks, Lehigh3 hr
Jul 13, 5:26 PM EDTTornado WarningPHIBerks, Chester, Montgomery28 min
Jul 13, 5:30 PM EDTSpecial Weather StatementPHIDelaware, Philadelphia45 min
Jul 13, 5:31 PM EDTFlash Flood WarningPHIBucks3 hr
Jul 13, 5:36 PM EDTSpecial Weather StatementPHIMontgomery39 min
Jul 13, 5:44 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery46 min
Jul 13, 5:56 PM EDTSpecial Weather StatementPHIBerks34 min
Jul 13, 6:28 PM EDTSpecial Weather StatementPHIBucks47 min
Jul 13, 6:34 PM EDTSpecial Weather StatementPHIDelaware, Montgomery, Philadelphia41 min
Jul 13, 7:03 PM EDTAreal Flood AdvisoryPHIChester, Montgomery117 min
Jul 13, 7:12 PM EDTSpecial Weather StatementPHIPhiladelphia48 min
Jul 13, 7:26 PM EDTSpecial Weather StatementPHIBerks, Montgomery64 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017Every severe thunderstorm warning in 2017

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.