Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 109, NWS Philadelphia/Mount Holly

October 7, 20135 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 7, 2013, 12:12 PM EDT for 5 counties in Pennsylvania. It was in force for 63 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: Oct 7, 2013, 12:12 PM EDT (16:12 UTC)
Expired: Oct 7, 2013, 1:15 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Binghamton radar (KBGM), 140 km from the middle of the area, began a volume at 16:12 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.

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, 4.2 hours before the alert went out and 170 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.

200 
WUUS51 KPHI 071612
SVRPHI
PAC011-025-077-089-095-071715-
/O.NEW.KPHI.SV.W.0109.131007T1612Z-131007T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1212 PM EDT MON OCT 7 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  WESTERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  WEST CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 115 PM EDT

* AT 1207 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS. THESE SEVERE STORMS EXTENDED FROM
  TRESCKOW TO LAURELDALE...MOVING NORTHEAST AT 50 MPH. THESE STORMS
  ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. 

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WEATHERLY AND NESQUEHONING AROUND 1220 PM EDT...
  NEW TRIPOLI AROUND 1225 PM EDT...
  JIM THORPE AND LEHIGHTON AROUND 1230 PM EDT...
  CHRISTMANS AND SCHNECKSVILLE AROUND 1235 PM EDT...
  PALMERTON AND WALNUTPORT AROUND 1240 PM EDT...
  PENN FOREST RESERVOIR AND MECKESVILLE AROUND 1245 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4104 7522 4034 7594 4065 7597 4074 7577
      4084 7592 4092 7600 4100 7575 4102 7574
      4105 7578 4110 7576 4114 7569 4113 7564
      4123 7554 4125 7523
TIME...MOT...LOC 1611Z 216DEG 45KT 4094 7591 4044 7590

$$

SZATKOWSKI

1 follow-up statement

157 
WWUS51 KPHI 071658
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1258 PM EDT MON OCT 7 2013

PAC011-025-077-089-095-071708-
/O.CAN.KPHI.SV.W.0109.000000T0000Z-131007T1715Z/
BERKS PA-LEHIGH PA-MONROE PA-CARBON PA-NORTHAMPTON PA-
1258 PM EDT MON OCT 7 2013

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL NORTHAMPTON...
CARBON...WESTERN MONROE...NORTHWESTERN LEHIGH AND NORTH CENTRAL BERKS
COUNTIES IS CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

LAT...LON 4104 7522 4034 7594 4065 7597 4074 7577
      4084 7592 4092 7600 4100 7575 4102 7574
      4105 7578 4110 7576 4114 7569 4113 7564
      4123 7554 4125 7523
TIME...MOT...LOC 1658Z 216DEG 45KT 4141 7545 4091 7544

$$

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, 11:50 AM EDT	Severe Thunderstorm Warning	PHI	Berks	40 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.