Alert archive / Pennsylvania / Tornado Warnings in 2021

Tornado Warning 5, NWS Pittsburgh, PA

June 21, 2021Allegheny County, Beaver County, Butler County, Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Jun 21, 2021, 2:51 PM EDT for Allegheny County, Beaver County, Butler County, Pennsylvania. It was in force for 9 min. 9 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: Jun 21, 2021, 2:51 PM EDT (18:51 UTC)
Expired: Jun 21, 2021, 3:00 PM EDT
In force: 9 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Allegheny County, PA, Beaver County, PA, Butler County, PA

The radar

The Pittsburgh radar (KPBZ), 20 km from the middle of the area, began a volume at 18:51 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
Jun 21, 2:51 PM EDT	TSTM WND DMG	1 Nw Warrendale, PA	LARGE LIMBS DOWN ALONG STATE ROUTE 19 NEAR THE INTERCHANGE OF 79/76
Jun 21, 2:51 PM EDT	TSTM WND DMG	Warrendale, PA	OVER 20 LARGE TREES SNAPPED OR UPROOTED.
Jun 21, 2:53 PM EDT	TORNADO	1 S Seven Fields, PA	EF0 CONFIRMED TORNADO
Jun 21, 2:54 PM EDT	TSTM WND DMG	Seven Fields, PA	REPORT OF NUMEROUS SNAPPED TREES IN SEVEN FIELDS. TIME ESTIMATED BASED ON RADAR.
Jun 21, 2:58 PM EDT	TSTM WND DMG	2 Ne Economy, PA	SEVERAL SMALL TREES SNAPPED ONTOP OF AT LEAST THREE LARGE BRANCHES.
Jun 21, 2:58 PM EDT	TSTM WND DMG	2 Se Callery, PA	TREE LIMBS DOWN AND SHINGLE BLOWN OFF ROOF.
Jun 21, 3:01 PM EDT	TSTM WND DMG	1 Nne Bakerstown Statio, PA	TREE DOWN ON 2 WIRES; PHOTO PROVIDED.
Jun 21, 3:01 PM EDT	TSTM WND DMG	2 W Warrendale, PA	SEVERAL LARGE BRANCHES SNAPPED OFF AT LEAST FOUR TREES.
Jun 21, 3:10 PM EDT	TSTM WND DMG	1 N Wexford, PA	TREES DOWN ACROSS WARRENDALE-BANE 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
Jun 21, 12:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 6.9 hours before the alert went out and 30 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: 931 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

As transmitted.

016 
WFUS51 KPBZ 211851
TORPBZ
PAC003-007-019-211900-
/O.NEW.KPBZ.TO.W.0005.210621T1851Z-210621T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pittsburgh PA
251 PM EDT Mon Jun 21 2021

The National Weather Service in Pittsburgh has issued a

* Tornado Warning for...
  East central Beaver County in western Pennsylvania...
  Southwestern Butler County in west central Pennsylvania...
  North central Allegheny County in southwestern Pennsylvania...

* Until 300 PM EDT.
    
* At 251 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Cranberry, moving east at 40 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 dangerous storm will be near...
  Seven Fields around 255 PM EDT.
  Gibsonia and Mars around 300 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Callery, Valencia, Warrendale, Pine Township and Bradfordwoods.

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.

Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 
 
&&

LAT...LON 4064 8015 4069 8017 4078 8000 4065 7995
TIME...MOT...LOC 1851Z 251DEG 35KT 4068 8011 

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

$$

1 follow-up statement

611 
WWUS51 KPBZ 211859
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
259 PM EDT Mon Jun 21 2021

PAC003-007-019-211909-
/O.EXP.KPBZ.TO.W.0005.000000T0000Z-210621T1900Z/
Beaver PA-Butler PA-Allegheny PA-
259 PM EDT Mon Jun 21 2021

...THE TORNADO WARNING FOR EAST CENTRAL BEAVER...SOUTHWESTERN BUTLER
AND NORTH CENTRAL ALLEGHENY COUNTIES WILL EXPIRE AT 300 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western, southwestern and west central Pennsylvania.

LAT...LON 4064 8015 4069 8017 4078 8000 4065 7995
TIME...MOT...LOC 1859Z 251DEG 35KT 4070 8003 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:55 PM EDT	Special Weather Statement	PBZ	Armstrong	20 min
Jun 21, 7:27 AM EDT	Special Weather Statement	PBZ	Lawrence, Mercer	33 min
Jun 21, 1:57 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	48 min
Jun 21, 2:08 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette	22 min
Jun 21, 2:15 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	30 min
Jun 21, 2:21 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	24 min
Jun 21, 2:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Lawrence, Washington	23 min
Jun 21, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Venango	30 min
Jun 21, 2:55 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Beaver, Butler, Westmoreland	35 min
Jun 21, 2:58 PM EDT	Tornado Warning	PBZ	Allegheny, Butler	17 min
Jun 21, 3:00 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	30 min
Jun 21, 3:21 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Indiana, Westmoreland	24 min
Jun 21, 3:25 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Westmoreland	35 min
Jun 21, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	46 min
Jun 21, 3:37 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Jefferson, Westmoreland	23 min
Jun 21, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Indiana, Westmoreland	45 min
Jun 21, 3:47 PM EDT	Special Weather Statement	PBZ	Washington	28 min
Jun 21, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	37 min
Jun 21, 3:55 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Westmoreland	111 min
Jun 21, 3:55 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	35 min
Jun 21, 3:57 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	33 min
Jun 21, 4:05 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	25 min
Jun 21, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 4:18 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	27 min
Jun 21, 4:19 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	41 min
Jun 21, 4:27 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	33 min
Jun 21, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	32 min
Jun 21, 4:41 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington, Westmoreland	49 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	32 min
Jun 21, 4:57 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	29 min
Jun 21, 5:03 PM EDT	Tornado Warning	PBZ	Greene	6 min
Jun 21, 5:08 PM EDT	Areal Flood Advisory	PBZ	Fayette, Greene, Washington, Westmoreland	3 hr
Jun 21, 6:39 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Greene, Washington, Westmoreland	2 hr
Jun 21, 6:43 PM EDT	Special Weather Statement	PBZ	Fayette	32 min
Jun 21, 7:23 PM EDT	Flash Flood Warning	PBZ	Allegheny, Fayette, Washington, Westmoreland	3 hr
Jun 21, 7:46 PM EDT	Areal Flood Warning	PBZ	Fayette, Greene, Washington, Westmoreland	3 hr

Nearby

Tornado Warnings in Pennsylvania, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.