Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 72, NWS Pittsburgh, PA

June 21, 2021Armstrong County, Indiana County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 3:55 PM EDT for Armstrong County, Indiana County, Westmoreland County, Pennsylvania. It was in force for 35 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, 3:55 PM EDT (19:55 UTC)
Expired: Jun 21, 2021, 4:30 PM EDT
In force: 35 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Armstrong County, PA, Indiana County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 95 km from the middle of the area, began a volume at 19:59 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, 3:55 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
Jun 21, 4:31 PM EDT	TSTM WND DMG	Black Lick, PA	TREES DOWN
Jun 21, 4:38 PM EDT	TSTM WND DMG	1 E Jacksonville, PA	TREES DOWN ON HUNTER SCHOOL 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, 7.9 hours before the alert went out and 87 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.

057 
WUUS51 KPBZ 211955
SVRPBZ
PAC005-063-129-212030-
/O.NEW.KPBZ.SV.W.0072.210621T1955Z-210621T2030Z/

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

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Indiana County in west central Pennsylvania...
  Northeastern Westmoreland County in southwestern Pennsylvania...
  Southeastern Armstrong County in west central Pennsylvania...

* Until 430 PM EDT.

* At 355 PM EDT, severe thunderstorms were located along a line
  extending from 7 miles south of Punxsutawney to near Blairsville,
  moving east at 50 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...                        Homer City...
  Blairsville...                    Derry...
  Black Lick...                     Clymer...
  Avonmore...                       Saltsburg...
  West Lebanon...                   New Florence...
  New Alexandria...                 Chevy Chase Heights...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 4050 7891 4034 7901 4031 7924 4049 7958
      4063 7932 4080 7925 4080 7881 4072 7880
TIME...MOT...LOC 1955Z 249DEG 43KT 4084 7902 4046 7936 

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

1 follow-up statement

675 
WWUS51 KPBZ 212009
SVSPBZ

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

PAC005-212019-
/O.CAN.KPBZ.SV.W.0072.000000T0000Z-210621T2030Z/
Armstrong PA-
409 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ARMSTRONG COUNTY
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 4035 7900 4039 7938 4049 7942 4060 7922
      4073 7915 4074 7880 4072 7880 4050 7891
TIME...MOT...LOC 2009Z 249DEG 43KT 4089 7884 4051 7918 

$$

PAC063-129-212030-
/O.CON.KPBZ.SV.W.0072.000000T0000Z-210621T2030Z/
Indiana PA-Westmoreland PA-
409 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHERN INDIANA AND EAST CENTRAL WESTMORELAND COUNTIES...

At 409 PM EDT, severe thunderstorms were located along a line
extending from 8 miles southeast of Punxsutawney to near Homer City,
moving east at 50 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...                        Homer City...
Blairsville...                    Black Lick...
Clymer...                         New Florence...
Chevy Chase Heights...            Seward...
Bolivar...                        Ernest...
Vintondale...                     Cherry Tree...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
Please report severe weather by calling 412-262-1988, posting to 
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH. 

&&

LAT...LON 4035 7900 4039 7938 4049 7942 4060 7922
      4073 7915 4074 7880 4072 7880 4050 7891
TIME...MOT...LOC 2009Z 249DEG 43KT 4089 7884 4051 7918 

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

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, 3:37 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, 3:57 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.