Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 70, NWS Pittsburgh, PA

June 21, 20214 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 3:45 PM EDT for 4 counties in Pennsylvania. It was in force for 45 min. 8 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, 3:45 PM EDT (19:45 UTC)
Expired: Jun 21, 2021, 4:30 PM EDT
In force: 45 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, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 41 km from the middle of the area, began a volume at 19:48 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, 3:45 PM EDT	TSTM WND DMG	Lawrenceville, PA	LARGE TREE LIMBS DOWN
Jun 21, 3:46 PM EDT	TSTM WND DMG	Lawrenceville, PA	LARGE TREE DOWN ON 46TH STREET.
Jun 21, 4:04 PM EDT	TSTM WND DMG	White Oak, PA	SOME SIDING BLOWN OFF HOUSE
Jun 21, 4:07 PM EDT	TSTM WND DMG	1 Sw Circleville, PA	TREES DOWN AT INTERSECTION OF WAINWRIGHT AND ROTH DRIVE
Jun 21, 4:07 PM EDT	TSTM WND DMG	Jacktown, PA	REPORT OF LARGE TREE BLOWN DOWN AT THE CORNER OF MAUS AND ROBBINS STATION. TIME ESTIMATED BASED ON RADAR.
Jun 21, 4:10 PM EDT	TSTM WND DMG	Delmont, PA	MULTIPLE TREES DOWN ACROSS THE COUNTY.
Jun 21, 4:12 PM EDT	TSTM WND DMG	1 E Adamsburg, PA	TREE DOWN.
Jun 21, 4:21 PM EDT	TSTM WND DMG	1 Ese White Oak, PA	SIDING BLOWN OFF HOME ON STATE STREET.

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, 7.8 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.

105 
WUUS51 KPBZ 211945
SVRPBZ
PAC003-005-063-129-212030-
/O.NEW.KPBZ.SV.W.0070.210621T1945Z-210621T2030Z/

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

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Southwestern Indiana County in west central Pennsylvania...
  Northeastern Allegheny County in southwestern Pennsylvania...
  Northwestern Westmoreland County in southwestern Pennsylvania...
  South central Armstrong County in west central Pennsylvania...

* Until 430 PM EDT.

* At 345 PM EDT, a severe thunderstorm was located over Penn Hills,
  moving east at 45 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...
  Pittsburgh...                     Penn Hills...
  Mount Lebanon...                  Ross Township...
  Monroeville...                    Greensburg...
  McKeesport...                     Jeannette...
  Apollo...                         Shaler Township...
  Plum...                           West Mifflin...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 45 and 69.
  Interstate 79 in Pennsylvania between mile markers 58 and 60.
  Interstate 376 in Pennsylvania between mile markers 62 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm has 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 4042 8016 4061 7977 4056 7941 4040 7936
      4027 7965
TIME...MOT...LOC 1945Z 277DEG 38KT 4048 7982 

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

2 follow-up statements

254 
WWUS51 KPBZ 212000
SVSPBZ

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

PAC003-005-063-129-212030-
/O.CON.KPBZ.SV.W.0070.000000T0000Z-210621T2030Z/
Indiana PA-Allegheny PA-Westmoreland PA-Armstrong PA-
400 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN INDIANA...EAST CENTRAL ALLEGHENY...NORTHWESTERN
WESTMORELAND AND SOUTH CENTRAL ARMSTRONG COUNTIES...

At 400 PM EDT, a severe thunderstorm was located over Murrysville, or
8 miles east of Monroeville, moving east at 45 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...
Pittsburgh...                     Penn Hills...
Monroeville...                    Greensburg...
McKeesport...                     Jeannette...
Apollo...                         Plum...
West Mifflin...                   Baldwin...
Murrysville...                    Wilkinsburg...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 52 and 69.
  Interstate 376 in Pennsylvania between mile markers 74 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm has a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!

This storm is producing widespread wind damage. Seek shelter inside a
sturdy structure and stay away from windows!

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover.

Continuous cloud-to-ground lightning is occurring with this storm.
Move indoors immediately.

Torrential rainfall is occurring with this storm and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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

&&

LAT...LON 4039 8002 4059 7961 4056 7941 4040 7936
      4027 7965
TIME...MOT...LOC 2000Z 277DEG 38KT 4046 7961 

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

003 
WWUS51 KPBZ 212011
SVSPBZ

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

PAC003-005-063-129-212030-
/O.CON.KPBZ.SV.W.0070.000000T0000Z-210621T2030Z/
Indiana PA-Allegheny PA-Westmoreland PA-Armstrong PA-
411 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR SOUTHWESTERN INDIANA...SOUTHEASTERN ALLEGHENY...WEST CENTRAL
WESTMORELAND AND SOUTHERN ARMSTRONG COUNTIES...

At 411 PM EDT, a severe thunderstorm was located near Delmont, or 10
miles northwest of Latrobe, moving east at 45 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...
Greensburg...                     McKeesport...
Jeannette...                      Murrysville...
White Oak...                      Irwin...
Manor...                          Delmont...
Avonmore...                       Export...
Saltsburg...                      North Irwin...

This includes Pennsylvania Turnpike between mile markers 62 and 69.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm has a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!

This storm is producing widespread wind damage. Seek shelter inside a
sturdy structure and stay away from windows!

Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover.

Continuous cloud-to-ground lightning is occurring with this storm.
Move indoors immediately.

Torrential rainfall is occurring with this storm and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

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

&&

LAT...LON 4033 7984 4043 7959 4056 7943 4056 7941
      4040 7936 4027 7965
TIME...MOT...LOC 2011Z 277DEG 38KT 4045 7946 

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, 3:47 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.