Alert archive / Pennsylvania / Tornado Warnings in 2016

Tornado Warning 8, NWS Pittsburgh, PA

September 17, 20164 counties in Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Sep 17, 2016, 6:25 PM EDT for 4 counties in Pennsylvania. It was in force for 35 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: Sep 17, 2016, 6:25 PM EDT (22:25 UTC)
Expired: Sep 17, 2016, 7:00 PM EDT
In force: 35 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

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

The radar

The Pittsburgh radar (KPBZ), 76 km from the middle of the area, began a volume at 22:24 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 nearest sounding before it

Pittsburgh, PA (KAGC), launched 12:00Z, 10.4 hours before the alert went out and 85 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: 76 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 974 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

785 
WFUS51 KPBZ 172225
TORPBZ
PAC005-019-031-121-172300-
/O.NEW.KPBZ.TO.W.0008.160917T2225Z-160917T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
625 PM EDT SAT SEP 17 2016

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN ARMSTRONG COUNTY IN WEST CENTRAL PENNSYLVANIA...
  SOUTH CENTRAL VENANGO COUNTY IN NORTHWESTERN PENNSYLVANIA...
  NORTHEASTERN BUTLER COUNTY IN WEST CENTRAL PENNSYLVANIA...
  WEST CENTRAL CLARION COUNTY IN WEST CENTRAL PENNSYLVANIA...

* UNTIL 700 PM EDT..

* AT 625 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 8 MILES NORTHEAST OF SLIPPERY ROCK...OR 9
  MILES EAST OF GROVE CITY...MOVING EAST AT 30 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED.
           DAMAGE TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR. TREE
           DAMAGE IS LIKELY. 

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  NORTHWESTERN ARMSTRONG...SOUTH CENTRAL VENANGO...NORTHEASTERN
  BUTLER AND WEST CENTRAL CLARION COUNTIES...INCLUDING THE FOLLOWING
  LOCATIONS: EMLENTON...CALLENSBURG...ST. PETERSBURG...CHERRY
  VALLEY...EAU CLAIRE...FOXBURG...CLINTONVILLE AND PARKER.

THIS INCLUDES  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 35
AND 50.
 
PLEASE REPORT SEVERE WEATHER BY CALLING 4 1 2...2 6 2...1 9 8 8...
POSTING TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN
A MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4108 7996 4117 7998 4126 7963 4111 7955
TIME...MOT...LOC 2225Z 253DEG 24KT 4113 7992 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

24

2 follow-up statements

941 
WWUS51 KPBZ 172237
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
637 PM EDT SAT SEP 17 2016

PAC005-019-031-121-172300-
/O.CON.KPBZ.TO.W.0008.000000T0000Z-160917T2300Z/
ARMSTRONG PA-VENANGO PA-BUTLER PA-CLARION PA-
637 PM EDT SAT SEP 17 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM EDT FOR
NORTHWESTERN ARMSTRONG...SOUTH CENTRAL VENANGO...NORTHEASTERN BUTLER
AND WEST CENTRAL CLARION COUNTIES...
    
AT 637 PM EDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 13 MILES NORTHEAST OF SLIPPERY ROCK...OR 14 MILES EAST OF
GROVE CITY...MOVING EAST AT 30 MPH.

HAZARD...TORNADO. 

SOURCE...RADAR INDICATED ROTATION. 

IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT
         SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE
         TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR.  TREE DAMAGE
         IS LIKELY. 

LOCATIONS IMPACTED INCLUDE...
EMLENTON...CLINTONVILLE...ST. PETERSBURG...EAU CLAIRE...FOXBURG AND
CHERRY VALLEY.

THIS INCLUDES  INTERSTATE 80 IN PENNSYLVANIA BETWEEN MILE MARKERS 35
AND 50.
 
PLEASE REPORT SEVERE WEATHER BY CALLING 4 1 2...2 6 2...1 9 8 8...
POSTING TO THE NWS PITTSBURGH FACEBOOK PAGE...OR USING TWITTER
@NWSPITTSBURGH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN
A MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4111 7982 4113 7990 4119 7990 4126 7963
      4114 7956
TIME...MOT...LOC 2237Z 253DEG 24KT 4115 7982 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

24

281 
WWUS51 KPBZ 172255
SVSPBZ

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
655 PM EDT SAT SEP 17 2016

PAC005-019-031-121-172305-
/O.EXP.KPBZ.TO.W.0008.000000T0000Z-160917T2300Z/
ARMSTRONG PA-VENANGO PA-BUTLER PA-CLARION PA-
655 PM EDT SAT SEP 17 2016

...THE TORNADO WARNING FOR NORTHWESTERN ARMSTRONG...SOUTH CENTRAL
VENANGO...NORTHEASTERN BUTLER AND WEST CENTRAL CLARION COUNTIES WILL
EXPIRE AT 700 PM EDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE...THE WARNING WILL BE ALLOWED TO EXPIRE.  HOWEVER GUSTY
WINDS ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4111 7982 4113 7990 4119 7990 4126 7963
      4114 7956
TIME...MOT...LOC 2255Z 241DEG 24KT 4121 7969 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 4:08 PM EDT	Special Weather Statement	PBZ	Mercer	37 min
Sep 17, 5:46 PM EDT	Special Weather Statement	PBZ	Mercer	29 min
Sep 17, 5:49 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	26 min
Sep 17, 6:01 PM EDT	Tornado Warning	PBZ	Butler, Lawrence, Mercer, Venango	29 min
Sep 17, 7:17 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	28 min
Sep 17, 7:33 PM EDT	Special Weather Statement	PBZ	Venango	27 min
Sep 17, 7:38 PM EDT	Tornado Warning Tornado observed	PBZ	Armstrong, Butler, Clarion, Venango	37 min
Sep 17, 7:40 PM EDT	Tornado Warning	PBZ	Forest, Venango	35 min

Nearby

Tornado Warnings in Pennsylvania, 2016 Every tornado warning in 2016 Tornadoes in 2016

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.