Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 108, NWS Philadelphia/Mount Holly

October 7, 2013Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 7, 2013, 11:50 AM EDT for Berks County, Pennsylvania. It was in force for 40 min. 3 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: Oct 7, 2013, 11:50 AM EDT (15:50 UTC)
Expired: Oct 7, 2013, 12:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 148 km from the middle of the area, began a volume at 15:52 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
Oct 7, 11:50 AM EDT	TSTM WND DMG	Upper Bern Twp, PA	SEVERAL TREES DOWN IN THE WESTERN PART OF THE COUINTY.
Oct 7, 11:50 AM EDT	TSTM WND DMG	Upper Bern Twp, PA	SEVERAL TREES DOWN IN THE WESTERN PART OF THE COUNTY.
Oct 7, 12:15 PM EDT	TSTM WND DMG	Reading, PA	TREES DOWN

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
Oct 7, 8:56 AM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 3.8 hours before the alert went out and 115 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: 114 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

249 
WUUS51 KPHI 071550
SVRPHI
PAC011-071630-
/O.NEW.KPHI.SV.W.0108.131007T1550Z-131007T1630Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1150 AM EDT MON OCT 7 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 1230 PM EDT

* AT 1142 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  SCHUYLKILL HAVEN TO LANCASTER...MOVING NORTHEAST AT 35 MPH. THESE
  STORMS ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WERNERSVILLE AROUND 1155 AM EDT...
  SINKING SPRING AND HAMBURG AROUND NOON EDT...
  LEESPORT AND WYOMISSING AROUND 1205 PM EDT...
  READING AND LENHARTSVILLE AROUND 1210 PM EDT...
  NEW MORGAN AND FLEETWOOD AROUND 1220 PM EDT...
  LYONS AND KUTZTOWN AROUND 1225 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WIND DAMAGE WAS REPORTED WITH THIS LINE OF STORMS IN LEBANON COUNTY 
PA. 

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A
STRONG BUILDING...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.


&&

LAT...LON 4057 7608 4059 7605 4058 7603 4063 7600
      4065 7599 4068 7589 4055 7570 4020 7578
      4015 7590 4034 7619 4054 7619
TIME...MOT...LOC 1548Z 246DEG 30KT 4064 7609 4005 7617

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 11:31 AM EDT	Special Weather Statement	PHI	Berks, Chester	59 min
Oct 7, 12:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	63 min
Oct 7, 12:41 PM EDT	Special Weather Statement	PHI	Chester	64 min
Oct 7, 12:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	41 min
Oct 7, 1:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	25 min
Oct 7, 1:30 PM EDT	Special Weather Statement	PHI	Monroe, Northampton	60 min
Oct 7, 1:33 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	42 min
Oct 7, 1:37 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	53 min
Oct 7, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	46 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2013 Every 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.