Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS Pittsburgh, PA

June 21, 20215 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 3:37 PM EDT for 5 counties in Pennsylvania. It was in force for 23 min. 5 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, 3:37 PM EDT (19:37 UTC)
Expired: Jun 21, 2021, 4:00 PM EDT
In force: 23 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allegheny County, PA, Armstrong County, PA, Indiana County, PA, Jefferson County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 87 km from the middle of the area, began a volume at 19:38 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, 3:38 PM EDT	TSTM WND DMG	1 Ene Spring Church, PA	VIDEO OF TREES COMING DOWN FROM WIND
Jun 21, 3:39 PM EDT	TSTM WND DMG	Spring Church, PA	TREES DOWN; VIDEO PROVIDED.
Jun 21, 3:55 PM EDT	TSTM WND DMG	2 Ssw Smathers, PA	TREES DOWN ON BLACK LICK ROAD
Jun 21, 3:58 PM EDT	TSTM WND DMG	1 E Jacksonville, PA	TREES DOWN ON HUNTER SCHOOL ROAD
Jun 21, 4:00 PM EDT	TSTM WND DMG	Homer City, PA	TREES DOWN ON RESIDENCE IN CENTER TOWNSHIP

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, 7.6 hours before the alert went out and 82 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.

334 
WUUS51 KPBZ 211937
SVRPBZ
PAC003-005-063-065-129-212000-
/O.NEW.KPBZ.SV.W.0069.210621T1937Z-210621T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
337 PM EDT Mon Jun 21 2021

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Central Indiana County in west central Pennsylvania...
  Eastern Allegheny County in southwestern Pennsylvania...
  Southwestern Jefferson County in west central Pennsylvania...
  Northwestern Westmoreland County in southwestern Pennsylvania...
  Southeastern Armstrong County in west central Pennsylvania...

* Until 400 PM EDT.

* At 337 PM EDT, severe thunderstorms were located along a line
  extending from 9 miles southeast of New Bethlehem to near
  Murrysville, moving east at 55 mph.

  HAZARD...Wind gusts to 60 mph.

  SOURCE...Radar.

  IMPACT...Expect damage to trees and power lines, resulting in some 
           power outages.

* Locations impacted include...
  Monroeville...                    Indiana...
  Punxsutawney...                   Vandergrift...
  Homer City...                     Apollo...
  Plum...                           Murrysville...
  Clymer...                         North Apollo...
  Avonmore...                       Orchard Hills...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
Intense thunderstorm lines can produce brief tornadoes and widespread
wind damage. Move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 4094 7894 4061 7898 4041 7935 4044 7975
      4094 7934
TIME...MOT...LOC 1937Z 262DEG 47KT 4090 7921 4042 7967 

HAIL...<.75IN
WIND...60MPH
 
$$

2 follow-up statements

966 
WWUS51 KPBZ 211947
SVSPBZ

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

PAC003-065-211957-
/O.CAN.KPBZ.SV.W.0069.000000T0000Z-210621T2000Z/
Allegheny PA-Jefferson PA-
347 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ALLEGHENY AND
SOUTHWESTERN JEFFERSON COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4089 7895 4061 7898 4041 7935 4056 7965
      4088 7939
TIME...MOT...LOC 1947Z 262DEG 47KT 4092 7905 4044 7951 

$$

PAC005-063-129-212000-
/O.CON.KPBZ.SV.W.0069.000000T0000Z-210621T2000Z/
Indiana PA-Westmoreland PA-Armstrong PA-
347 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR CENTRAL INDIANA...NORTH CENTRAL WESTMORELAND AND SOUTHEASTERN
ARMSTRONG COUNTIES...

At 347 PM EDT, severe thunderstorms were located along a line
extending from near Punxsutawney to near Delmont, moving east at 55
mph.

HAZARD...Wind gusts to 60 mph.

SOURCE...Radar.

IMPACT...Expect damage to trees and power lines, resulting in some 
         power outages.

Locations impacted include...
Indiana...                        Vandergrift...
Homer City...                     Apollo...
Clymer...                         North Apollo...
Avonmore...                       Orchard Hills...
Rural Valley...                   Saltsburg...
Oklahoma...                       West Lebanon...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.

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

&&

LAT...LON 4089 7895 4061 7898 4041 7935 4056 7965
      4088 7939
TIME...MOT...LOC 1947Z 262DEG 47KT 4092 7905 4044 7951 

HAIL...<.75IN
WIND...60MPH
 
$$

578 
WWUS51 KPBZ 211957 RRA
SVSPBZ

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

PAC005-063-129-212007-
/O.EXP.KPBZ.SV.W.0069.000000T0000Z-210621T2000Z/
Indiana PA-Westmoreland PA-Armstrong PA-
357 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL INDIANA...NORTH
CENTRAL WESTMORELAND AND SOUTHEASTERN ARMSTRONG COUNTIES WILL EXPIRE
AT 400 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Eastern Armstrong county until 430 PM.

LAT...LON 4089 7895 4061 7898 4041 7935 4056 7965
      4088 7939
TIME...MOT...LOC 1957Z 270DEG 47KT 4093 7893 4045 7939 

$$

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, 2:51 PM EDT	Tornado Warning	PBZ	Allegheny, Beaver, Butler	9 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, 3:45 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

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every severe thunderstorm warning 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.