Alert archive / Pennsylvania / Tornado Warnings in 2011

Tornado Warning 4, NWS Pittsburgh, PA

April 25, 2011Armstrong County, Clarion County, Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Apr 25, 2011, 2:37 PM EDT for Armstrong County, Clarion County, Jefferson County, Pennsylvania. It was in force for 23 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: Apr 25, 2011, 2:37 PM EDT (18:37 UTC)
Expired: Apr 25, 2011, 3:00 PM EDT
In force: 23 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon

Counties Armstrong County, PA, Clarion County, PA, Jefferson County, PA

The radar

The Pittsburgh radar (KPBZ), 100 km from the middle of the area, began a volume at 18:40 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
Apr 25, 2:52 PM EDT	TSTM WND DMG	Coolspring, PA	TREES AND POWER LINES DOWN IN COOLSPRING.
Apr 25, 2:55 PM EDT	TSTM WND DMG	Ringgold, PA	TREES AND POWERLINES BLOCKING ROADWAY ON HUNGRY HOOK ROAD.
Apr 25, 2:57 PM EDT	TSTM WND DMG	1 N Oliveburg, PA	TREE DOWN ON BARTON CHAPEL RD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 6.6 hours before the alert went out and 100 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: 4 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 698 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 87 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.

112 
WFUS51 KPBZ 251837
TORPBZ
PAC005-031-065-251900-
/O.NEW.KPBZ.TO.W.0004.110425T1837Z-110425T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
237 PM EDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN ARMSTRONG COUNTY IN WEST CENTRAL PENNSYLVANIA...
  SOUTHWESTERN JEFFERSON COUNTY IN WEST CENTRAL PENNSYLVANIA...
  SOUTHEASTERN CLARION COUNTY IN WEST CENTRAL PENNSYLVANIA...

* UNTIL 300 PM EDT

* AT 235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR NEW
  BETHLEHEM...MOVING NORTHEAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO   NEW
  BETHLEHEM...      DORA...               SUMMERVILLE...
  BROOKVILLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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

&&

LAT...LON 4096 7935 4105 7932 4125 7904 4097 7880
      4091 7917 4092 7922 4091 7931
TIME...MOT...LOC 1837Z 244DEG 34KT 4100 7927

$$

WOODRUM

1 follow-up statement

829 
WWUS51 KPBZ 251853
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
253 PM EDT MON APR 25 2011

PAC005-031-251902-
/O.CAN.KPBZ.TO.W.0004.000000T0000Z-110425T1900Z/
ARMSTRONG PA-CLARION PA-
253 PM EDT MON APR 25 2011

...THE TORNADO WARNING FOR CLARION AND ARMSTRONG COUNTIES IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
MONDAY EVENING FOR EAST CENTRAL OHIO AND WESTERN PENNSYLVANIA AND
NORTHERN WEST VIRGINIA.

LAT...LON 4098 7916 4102 7918 4105 7920 4109 7920
      4125 7904 4097 7880
TIME...MOT...LOC 1852Z 245DEG 29KT 4103 7910

$$

PAC065-251900-
/O.CON.KPBZ.TO.W.0004.000000T0000Z-110425T1900Z/
JEFFERSON PA-
253 PM EDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM EDT FOR JEFFERSON
COUNTY IN WEST CENTRAL PENNSYLVANIA...

AT 248 PM EDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION.  THIS POSSIBLE TORNADO WAS 
LOCATED NEAR WORTHVILLE...MOVING NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
  BROOKVILLE...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

PLEASE REPORT SEVERE WEATHER 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 1000 PM EDT
MONDAY EVENING FOR EAST CENTRAL OHIO AND WESTERN PENNSYLVANIA AND
NORTHERN WEST VIRGINIA.

LAT...LON 4098 7916 4102 7918 4105 7920 4109 7920
      4125 7904 4097 7880
TIME...MOT...LOC 1852Z 245DEG 29KT 4103 7910

$$

WOODRUM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 1:39 PM EDT	Special Weather Statement	PBZ	Butler	36 min
Apr 25, 1:59 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Jefferson	46 min
Apr 25, 2:59 PM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	30 min
Apr 25, 4:54 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	36 min
Apr 25, 5:03 PM EDT	Special Weather Statement	PBZ	Forest, Venango	57 min
Apr 25, 5:23 PM EDT	Severe Thunderstorm Warning	PBZ	Forest	37 min
Apr 25, 5:24 PM EDT	Special Weather Statement	PBZ	Beaver	51 min
Apr 25, 5:50 PM EDT	Tornado Warning	PBZ	Forest	25 min
Apr 25, 5:59 PM EDT	Special Weather Statement	PBZ	Allegheny	31 min
Apr 25, 6:25 PM EDT	Special Weather Statement	PBZ	Armstrong	35 min
Apr 25, 6:36 PM EDT	Special Weather Statement	PBZ	Allegheny	24 min
Apr 25, 6:58 PM EDT	Special Weather Statement	PBZ	Jefferson	32 min

Nearby

Tornado Warnings in Pennsylvania, 2011 Every tornado warning in 2011 Tornadoes 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.