Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 76, NWS Pittsburgh, PA

June 21, 20214 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 4:18 PM EDT for 4 counties in Pennsylvania. It was in force for 27 min. 2 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, 4:18 PM EDT (20:18 UTC)
Expired: Jun 21, 2021, 4:45 PM EDT
In force: 27 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Fayette County, PA, Greene County, PA, Washington County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 64 km from the middle of the area, began a volume at 20:20 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, 4:28 PM EDT	TSTM WND DMG	1 Nne West Zollarsville, PA	REPORT OF TREES DOWN ON WIRE. TIME ESTIMATED BASED ON RADAR.
Jun 21, 4:52 PM EDT	TSTM WND DMG	Perryopolis, PA	TREE DOWN.

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, 8.3 hours before the alert went out and 47 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.

221 
WUUS51 KPBZ 212018
SVRPBZ
PAC051-059-125-129-212045-
/O.NEW.KPBZ.SV.W.0076.210621T2018Z-210621T2045Z/

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

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Southeastern Washington County in southwestern Pennsylvania...
  Southwestern Westmoreland County in southwestern Pennsylvania...
  Northeastern Greene County in southwestern Pennsylvania...
  Northwestern Fayette County in southwestern Pennsylvania...

* Until 445 PM EDT.

* At 418 PM EDT, severe thunderstorms were located along a line
  extending from near Youngwood to 6 miles northwest of Waynesburg,
  moving east at 40 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...
  Monessen...                       California...
  Charleroi...                      Bentleyville...
  Brownsville...                    Fredericktown-Millsboro...
  Perryopolis...                    Fairdale...
  Jefferson Boro...                 North Belle Vernon...
  North Charleroi...                Speers...

This includes the following highways...
  Interstate 70 in Pennsylvania between mile markers 32 and 43.
  Interstate 79 in Pennsylvania between mile markers 16 and 26.

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 4009 7960 3994 7971 3987 8000 3998 8038
      4017 7997
TIME...MOT...LOC 2018Z 285DEG 37KT 4025 7954 3998 8025 

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

1 follow-up statement

035 
WWUS51 KPBZ 212033
SVSPBZ

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

PAC051-059-125-129-212045-
/O.CON.KPBZ.SV.W.0076.000000T0000Z-210621T2045Z/
Washington PA-Westmoreland PA-Greene PA-Fayette PA-
433 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTHEASTERN WASHINGTON...SOUTHWESTERN WESTMORELAND...
NORTHEASTERN GREENE AND NORTHWESTERN FAYETTE COUNTIES...

At 433 PM EDT, severe thunderstorms were located along a line
extending from near Lawson Heights to Jefferson Boro, 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...
Monessen...                       California...
Charleroi...                      Bentleyville...
Brownsville...                    Fredericktown-Millsboro...
Perryopolis...                    Fairdale...
Jefferson Boro...                 North Belle Vernon...
North Charleroi...                Speers...

This includes the following highways...
  Interstate 70 in Pennsylvania between mile markers 35 and 43.
  Interstate 79 in Pennsylvania between mile markers 16 and 24.

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 4009 7960 3994 7971 3987 8000 3997 8033
      4016 7991
TIME...MOT...LOC 2033Z 285DEG 37KT 4021 7937 3995 8008 

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, 3:55 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, 4:19 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.