Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 262, NWS Philadelphia/Mount Holly

August 19, 2011Carbon County, Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2011, 2:35 PM EDT for Carbon County, Monroe County, Pennsylvania. It was in force for 70 min. 1 report 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: Aug 19, 2011, 2:35 PM EDT (18:35 UTC)
Expired: Aug 19, 2011, 3:45 PM EDT
In force: 70 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Carbon County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 128 km from the middle of the area, began a volume at 18:36 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
Aug 19, 2:45 PM EDT	HAIL 1.75	Tobyhanna, PA

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
Aug 19, 1:04 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 190 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: 146 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 359 m²/s²
0-3 km storm-relative helicity: 370 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.

915 
WUUS51 KPHI 191835
SVRPHI
PAC025-089-191945-
/O.NEW.KPHI.SV.W.0262.110819T1835Z-110819T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
235 PM EDT FRI AUG 19 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...

* UNTIL 345 PM EDT

* AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM MOUNTAINHOME TO BLAKESLEE TO
  WHITE HAVEN...OR ALONG A LINE EXTENDING FROM MOUNT POCONO TO 12
  MILES WEST OF MOUNT POCONO TO 15 MILES NORTHWEST OF LEHIGHTON...AND
  THE LINE IS MOVING SLOWLY EAST AT 5 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BLAKESLEE AROUND 300 PM EDT...
  BLAKESLEE AND WEATHERLY AROUND 305 PM EDT...
  MOUNTAINHOME...POCONO PINES...CANADENSIS AND LAKE HARMONY AROUND
  345 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 4124 7513 4116 7516 4115 7509 4113 7507
      4106 7523 4088 7572 4094 7592 4098 7586
      4101 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4123 7554 4125 7550 4126 7518
TIME...MOT...LOC 1835Z 270DEG 2KT 4118 7531 4110 7559
          4102 7585

$$

TFG

1 follow-up statement

834 
WWUS51 KPHI 191856
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
256 PM EDT FRI AUG 19 2011

PAC025-089-191945-
/O.CON.KPHI.SV.W.0262.000000T0000Z-110819T1945Z/
CARBON PA-MONROE PA-
256 PM EDT FRI AUG 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM EDT
FOR NORTHERN MONROE AND NORTHERN CARBON COUNTIES...

AT 250 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING GOLF
BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM SKYTOP TO BLAKESLEE
TO WHITE HAVEN...OR ALONG A LINE EXTENDING FROM 8 MILES NORTH OF
MOUNT POCONO TO 13 MILES WEST OF MOUNT POCONO TO 13 MILES NORTH OF
LEHIGHTON...AND THE LINE IS MOVING SOUTHEAST AT 5 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  TOBYHANNA BY 305 PM EDT...
  BLAKESLEE BY 310 PM EDT...
  WEATHERLY BY 315 PM EDT...
  LAKE HARMONY BY 335 PM EDT...
  POCONO PINES BY 340 PM EDT...
  CANADENSIS...MOUNTAINHOME...ALBRIGHTSVILLE AND SKYTOP BY 345 PM
  EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING LARGE DAMAGING HAIL AS
LARGE AS GOLF BALLS IN TOBYHANNA. SEEK SHELTER NOW INSIDE A 
STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY
CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY
EVENING FOR NORTHERN DELAWARE AND NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 4124 7513 4116 7516 4115 7509 4113 7507
      4106 7523 4088 7572 4094 7592 4098 7586
      4101 7575 4105 7578 4110 7577 4114 7570
      4113 7564 4123 7554 4125 7550 4126 7518
TIME...MOT...LOC 1855Z 303DEG 4KT 4124 7532 4110 7560
          4100 7580

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:08 PM EDT	Special Weather Statement	PHI	Berks	67 min
Aug 18, 8:26 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	112 min
Aug 18, 8:31 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	59 min
Aug 18, 8:48 PM EDT	Special Weather Statement	PHI	Monroe	57 min
Aug 18, 8:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	57 min
Aug 19, 12:02 AM EDT	Special Weather Statement	PHI	Chester	58 min
Aug 19, 12:50 AM EDT	Special Weather Statement	PHI	Chester, Delaware	40 min
Aug 19, 1:14 AM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	3 hr
Aug 19, 1:31 AM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	59 min
Aug 19, 4:00 AM EDT	Areal Flood Warning	PHI	Delaware	4 hr
Aug 19, 1:46 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	59 min
Aug 19, 2:38 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	3 hr
Aug 19, 2:57 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	3 hr
Aug 19, 3:47 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	58 min
Aug 19, 4:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	61 min
Aug 19, 4:32 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	2 hr
Aug 19, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	53 min
Aug 19, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Chester	55 min
Aug 19, 5:39 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	3 hr
Aug 19, 5:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Montgomery	48 min
Aug 19, 5:45 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	3 hr
Aug 19, 5:59 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	80 min
Aug 19, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	65 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2011 Every severe thunderstorm warning in 2011

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.