Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 21, NWS Pittsburgh, PA

May 27, 20125 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at May 27, 2012, 3:25 PM EDT for 5 counties in Pennsylvania. It was in force for 50 min. 4 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: May 27, 2012, 3:25 PM EDT (19:25 UTC)
Expired: May 27, 2012, 4:15 PM EDT
In force: 50 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Armstrong County, PA, Butler County, PA, Clarion County, PA, Mercer County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 95 km from the middle of the area, began a volume at 19:29 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
May 27, 3:29 PM EDT	TSTM WND DMG	Cranberry, PA	TREES AND POWER LINES DOWN
May 27, 3:46 PM EDT	HAIL 0.5	Kennerdell, PA	EVENT OCCURRED BETWEEN 331 PM 05/27/2012 AND 346 PM 05/27/2012
May 27, 3:52 PM EDT	TSTM WND DMG	Saint Petersburg, PA	TREE DOWN ACROSS ROAD
May 27, 4:02 PM EDT	TSTM WND DMG	Clarion, PA	TREE DOWN AT FOREST DRIVE AND MILLER ROAD

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
May 27, 1:33 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.4 hours before the alert went out and 105 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: 993 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 47 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.

786 
WUUS51 KPBZ 271925
SVRPBZ
PAC005-019-031-085-121-272015-
/O.NEW.KPBZ.SV.W.0021.120527T1925Z-120527T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
325 PM EDT SUN MAY 27 2012

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHWESTERN ARMSTRONG COUNTY IN WEST CENTRAL
  PENNSYLVANIA...
  NORTHEASTERN BUTLER COUNTY IN WEST CENTRAL PENNSYLVANIA...
  CENTRAL CLARION COUNTY IN WEST CENTRAL PENNSYLVANIA...
  NORTHEASTERN MERCER COUNTY IN NORTHWEST PENNSYLVANIA...
  SOUTHERN VENANGO COUNTY IN NORTHWEST PENNSYLVANIA...

* UNTIL 415 PM EDT

* AT 324 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  POLK...MOVING EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
  STONEBORO...          MAURICE K GODDARD STATE PARK...
  POLK...               SUGARCREEK...         FRANKLIN...
  KENNERDELL...         CLINTONVILLE...       SENECA...
  EAU CLAIRE...         VAN...                EMLENTON...
  KNOX...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY
EVENING FOR EAST CENTRAL OHIO AND WESTERN PENNSYLVANIA AND NORTHERN
WEST VIRGINIA.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE. 1-877-633-6772.

&&

LAT...LON 4116 7921 4112 7985 4133 8021 4149 8006
      4150 8001 4151 7998
TIME...MOT...LOC 1925Z 291DEG 26KT 4137 8000

$$

1 follow-up statement

988 
WWUS51 KPBZ 271941
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
341 PM EDT SUN MAY 27 2012

PAC005-019-031-085-121-272015-
/O.CON.KPBZ.SV.W.0021.000000T0000Z-120527T2015Z/
ARMSTRONG PA-BUTLER PA-CLARION PA-MERCER PA-VENANGO PA-
341 PM EDT SUN MAY 27 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR VENANGO...MERCER...CLARION...BUTLER AND ARMSTRONG COUNTIES...

AT 338 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR POLK...MOVING EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
  SUGARCREEK...         STONEBORO...          POLK...
  MAURICE K GODDARD STATE PARK...             FRANKLIN...
  KENNERDELL...         CLINTONVILLE...       SENECA...
  EAU CLAIRE...         VAN...                EMLENTON...
  KNOX...

THIS STORM HAS PRODUCED WIDESPREAD WIND DAMAGE NEAR CRANBERRY. SEEK 
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY
EVENING FOR EAST CENTRAL OHIO AND WESTERN PENNSYLVANIA AND NORTHERN
WEST VIRGINIA.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE. 1-877-633-6772.

LAT...LON 4116 7921 4112 7985 4133 8021 4149 8006
      4150 8001 4151 7998
TIME...MOT...LOC 1941Z 291DEG 26KT 4131 7990

$$

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 2:00 PM EDT	Special Weather Statement	PBZ	Beaver	45 min
May 27, 2:14 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Lawrence	46 min
May 27, 2:46 PM EDT	Special Weather Statement	PBZ	Butler	59 min
May 27, 2:58 PM EDT	Special Weather Statement	PBZ	Lawrence	47 min
May 27, 3:02 PM EDT	Special Weather Statement	PBZ	Venango	58 min
May 27, 3:06 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Beaver, Butler, Clarion, Lawrence, Mercer	54 min
May 27, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson, Venango	45 min
May 27, 3:58 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Jefferson	47 min
May 27, 4:00 PM EDT	Special Weather Statement	PBZ	Butler, Lawrence	45 min
May 27, 4:20 PM EDT	Areal Flood Advisory	PBZ	Clarion, Venango	3 hr
May 27, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	47 min
May 27, 4:34 PM EDT	Special Weather Statement	PBZ	Beaver	41 min
May 27, 4:36 PM EDT	Special Weather Statement	PBZ	Armstrong, Indiana	39 min
May 27, 4:41 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	64 min
May 27, 5:01 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	59 min
May 27, 5:12 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	63 min
May 27, 5:42 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	18 min
May 27, 5:55 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	35 min
May 27, 6:11 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	34 min
May 27, 6:16 PM EDT	Areal Flood Advisory	PBZ	Indiana, Westmoreland	78 min
May 27, 6:46 PM EDT	Special Weather Statement	PBZ	Fayette	44 min
May 27, 7:25 PM EDT	Areal Flood Advisory	PBZ	Fayette, Westmoreland	2 hr
May 27, 7:48 PM EDT	Special Weather Statement	PBZ	Fayette	42 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2012 Every severe thunderstorm warning in 2012

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.