Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 192, NWS Philadelphia/Mount Holly

September 5, 20174 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 5, 2017, 4:08 PM EDT for 4 counties in Pennsylvania. It was in force for 52 min. 6 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: Sep 5, 2017, 4:08 PM EDT (20:08 UTC)
Expired: Sep 5, 2017, 5:00 PM EDT
In force: 52 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Berks County, PA, Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 148 km from the middle of the area, began a volume at 20:10 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

Time	Report	Where	Remark
Sep 5, 4:14 PM EDT	HAIL 1	3 N Wernersville, PA	QUARTER -SIZE HAIL.
Sep 5, 4:14 PM EDT	HAIL 1	3 N Wernersville, PA	QUARTER-SIZE HAIL
Sep 5, 4:40 PM EDT	TSTM WND DMG	3 N Wernersville, PA	TWO LARGE TREES DOWN WITH NUMEROUS LIMBS SCATTERED.
Sep 5, 4:40 PM EDT	TSTM WND DMG	3 N Wernersville, PA	TWO LARGE TREES DOWN WITH NUMEROUS LIMBS SCATTERED ABOUT.
Sep 5, 4:40 PM EDT	HAIL 0.5	Virginville, PA	MARBLE SIZE HAIL NEAR VIRGINVILLE.
Sep 5, 4:40 PM EDT	HAIL 0.5	Virginville, PA	MARBLE SIZE HAIL NEAR VIRGINVILLE. 1.75 TO 1.99 INCHES OF RAIN IN 1.5 HOURS.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 5, 3:26 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.1 hours before the alert went out and 226 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 4 J/kg
Mixed-layer CIN: -324 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

313 
WUUS51 KPHI 052008
SVRPHI
PAC011-025-077-095-052100-
/O.NEW.KPHI.SV.W.0192.170905T2008Z-170905T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
408 PM EDT TUE SEP 5 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Berks County in eastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  Southwestern Northampton County in eastern Pennsylvania...

* Until 500 PM EDT

* At 408 PM EDT, a severe thunderstorm was located near Wernersville,
  or 8 miles west of Reading, moving northeast at 20 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Allentown, Reading, Easton, Lehighton, Bethlehem, Emmaus,
  Wyomissing, Northampton, Wilson, Hellertown, Nazareth, Palmerton,
  Kutztown, Jim Thorpe, Hamburg, Slatington, Fleetwood, Sinking
  Spring, Laureldale and Womelsdorf.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4065 7598 4070 7583 4074 7576 4080 7586
      4090 7565 4081 7547 4075 7528 4062 7521
      4027 7608 4049 7643
TIME...MOT...LOC 2008Z 232DEG 14KT 4037 7608 

HAIL...0.75IN
WIND...60MPH
 
$$

JRK

2 follow-up statements

733 
WWUS51 KPHI 052013
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
413 PM EDT TUE SEP 5 2017

PAC011-025-077-095-052100-
/O.CON.KPHI.SV.W.0192.000000T0000Z-170905T2100Z/
Berks PA-Lehigh PA-Carbon PA-Northampton PA-
413 PM EDT TUE SEP 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR BERKS...LEHIGH...SOUTHEASTERN CARBON AND SOUTHWESTERN NORTHAMPTON
COUNTIES...

At 410 PM EDT, a severe thunderstorm was located over Wernersville,
or 7 miles west of Reading, moving northeast at 15 mph.

HAZARD...60 mph wind gusts and nickel size hail. 

SOURCE...Radar indicated. 

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

This severe storm will be near...
  Robesonia around 415 PM EDT. 
  Spring Ridge around 425 PM EDT. 
  Wyomissing and Fairview Hgts around 430 PM EDT. 
  Reading around 435 PM EDT. 
  Laureldale and Leesport around 440 PM EDT. 
  Shoemakersville around 450 PM EDT. 
  Kutztown, Fleetwood and Lyons around 500 PM EDT. 

Other locations impacted by this severe thunderstorm include
Wyomissing Hills, Chapman, West Lawn, Alburtis, Coplay, Fountain
Hill, Fullerton, West Reading, Hokendauqua and Bowmanstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe 
weather including large hail, destructive straight line winds and 
possibly a brief tornado. Move quickly to a safe shelter, such as an 
interior room, a bathroom or closet or basement.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4065 7598 4070 7583 4074 7576 4080 7586
      4090 7565 4081 7547 4075 7528 4062 7521
      4027 7608 4049 7643
TIME...MOT...LOC 2010Z 239DEG 13KT 4036 7606 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

JRK

915 
WWUS51 KPHI 052033
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
433 PM EDT TUE SEP 5 2017

PAC011-025-077-095-052100-
/O.CON.KPHI.SV.W.0192.000000T0000Z-170905T2100Z/
Berks PA-Lehigh PA-Carbon PA-Northampton PA-
433 PM EDT TUE SEP 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR BERKS...LEHIGH...SOUTHEASTERN CARBON AND SOUTHWESTERN NORTHAMPTON
COUNTIES...

At 431 PM EDT, severe thunderstorms were located along a line
extending from near Leesport to near Claussville, moving northeast at
30 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar and spotter indicated. At 405 PM, large hail to the 
         size of quarters was reported in Wernersville.

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

These severe storms will be near...
  Claussville around 435 PM EDT. 
  Ancient Oaks around 440 PM EDT. 
  Lenhartsville, Coffeetown and Schnecksville around 445 PM EDT. 
  Allentown, Emmaus, Lyons and Neffs around 450 PM EDT. 
  Kutztown around 455 PM EDT. 
  Bethlehem, Northampton, Bath, Topton, Steuben, Beersville and 
  Lehigh University around 500 PM EDT. 

Other locations impacted by these severe thunderstorms include
Wyomissing Hills, Chapman, West Lawn, Alburtis, Coplay, Fountain
Hill, Fullerton, West Reading, Hokendauqua and Bowmanstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes in addition 
to straight-line wind damage. Although a tornado is not immediately 
likely, it is best to move to an interior room on the lowest floor 
of a building. These storms may cause serious injury and significant 
property damage.

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.

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4065 7598 4070 7583 4074 7576 4080 7586
      4090 7565 4081 7547 4075 7528 4062 7521
      4027 7608 4049 7643
TIME...MOT...LOC 2031Z 237DEG 24KT 4043 7593 4058 7568 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

JRK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 3:59 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	31 min
Sep 5, 4:34 PM EDT	Areal Flood Advisory	PHI	Berks	6 hr
Sep 5, 4:54 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	51 min
Sep 5, 5:14 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 5, 5:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	56 min
Sep 5, 5:22 PM EDT	Areal Flood Advisory	PHI	Northampton	4 hr
Sep 5, 5:30 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Sep 5, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	41 min
Sep 5, 6:03 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	3 hr
Sep 5, 6:19 PM EDT	Special Weather Statement	PHI	Chester, Delaware	41 min
Sep 5, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	49 min
Sep 5, 6:44 PM EDT	Special Weather Statement	PHI	Bucks	31 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.