Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 116, NWS Philadelphia/Mount Holly

October 9, 2015Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 9, 2015, 4:01 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 44 min. 5 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 9, 2015, 4:01 PM EDT (20:01 UTC)
Expired: Oct 9, 2015, 4:45 PM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 129 km from the middle of the area, began a volume at 20:02 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 9, 4:21 PM EDT	TSTM WND DMG	Flying Hills, PA	LARGE TREE DOWN AT ROUTE 10 AND ROUTE 724 IN CUMRU TOWNSHIP.
Oct 9, 4:22 PM EDT	TSTM WND DMG	New Morgan, PA	TREES DOWN NEAR INTERSTATE 76
Oct 9, 4:22 PM EDT	NON-TSTM WND DMG	New Morgan, PA	TREES DOWN NEAR INTERSTATE 76
Oct 9, 4:32 PM EDT	TSTM WND GST 56	West Nantmeal Twp, PA	MULTIPLE TREES AND WIRES DOWN ALONG CREEK ROAD
Oct 9, 4:40 PM EDT	TSTM WND DMG	East Vincent Twp, PA	WIRES DOWN ON HICKORY GROVE ROAD. TIME ESTIMATED FROM RADAR.

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 9, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 188 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: 43 J/kg
Mixed-layer CIN: -181 J/kg
Mixed-layer LCL: 1203 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 126 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.

691 
WUUS51 KPHI 092001
SVRPHI
PAC011-029-092045-
/O.NEW.KPHI.SV.W.0116.151009T2001Z-151009T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
401 PM EDT FRI OCT 9 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

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

* UNTIL 445 PM EDT

* AT 359 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 65 MPH. THIS 
  STORM WAS LOCATED OVER DENVER...OR NEAR EPHRATA...AND MOVING EAST 
  AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  READING...WEST CHESTER...WYOMISSING...DOWNINGTOWN...BIRDSBORO...
  SINKING SPRING...WERNERSVILLE...ADAMSTOWN...HONEY BROOK...
  ELVERSON...NEW MORGAN...GLENMOORE...CHESTER SPRINGS...PUGHTOWN...
  LIONVILLE-MARCHWOOD...LIONVILLE...SPRING RIDGE...WEST GOSHEN...
  SHILLINGTON AND WEST READING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4038 7607 4017 7555 3994 7557 4005 7593
      4011 7594 4014 7588 4031 7615
TIME...MOT...LOC 1959Z 290DEG 37KT 4022 7615 

$$

SZATKOWSKI

1 follow-up statement

865 
WWUS51 KPHI 092018
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
418 PM EDT FRI OCT 9 2015

PAC011-029-092045-
/O.CON.KPHI.SV.W.0116.000000T0000Z-151009T2045Z/
CHESTER PA-BERKS PA-
418 PM EDT FRI OCT 9 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR NORTH CENTRAL CHESTER AND SOUTH CENTRAL BERKS COUNTIES...

AT 417 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS
LOCATED OVER NEW MORGAN...OR 11 MILES EAST OF NEW HOLLAND...MOVING
EAST AT 45 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY THE DAMAGING
WINDS.

LOCATIONS IMPACTED INCLUDE...
READING...WEST CHESTER...WYOMISSING...DOWNINGTOWN...BIRDSBORO...
SINKING SPRING...WERNERSVILLE...ADAMSTOWN...HONEY BROOK...ELVERSON...
NEW MORGAN...GLENMOORE...CHESTER SPRINGS...PUGHTOWN...
LIONVILLE-MARCHWOOD...LIONVILLE...SPRING RIDGE...WEST GOSHEN...
SHILLINGTON AND WEST READING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY
DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND
STAY AWAY FROM WINDOWS.

&&

LAT...LON 4038 7607 4017 7555 3994 7557 4005 7593
      4011 7594 4014 7588 4031 7615
TIME...MOT...LOC 2017Z 290DEG 37KT 4014 7588 

$$

SZATKOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 2:45 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	90 min
Oct 9, 3:17 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	58 min
Oct 9, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	51 min
Oct 9, 4:47 PM EDT	Tornado Warning	PHI	Chester, Montgomery	28 min
Oct 9, 5:25 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	65 min
Oct 9, 5:41 PM EDT	Special Weather Statement	PHI	Philadelphia	49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2015 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.