Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 80, NWS Pittsburgh, PA

June 21, 20214 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 2021, 4:41 PM EDT for 4 counties in Pennsylvania. It was in force for 49 min. 4 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, 4:41 PM EDT (20:41 UTC)
Expired: Jun 21, 2021, 5:30 PM EDT
In force: 49 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), 76 km from the middle of the area, began a volume at 20:41 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, 4:52 PM EDT	TSTM WND DMG	Perryopolis, PA	TREE DOWN.
Jun 21, 4:57 PM EDT	TSTM WND DMG	Brownsville, PA	TREE DOWN
Jun 21, 5:08 PM EDT	TSTM WND DMG	Masontown, PA	TREE DOWN.
Jun 21, 5:15 PM EDT	TSTM WND DMG	Jefferson, PA	MULTIPLE REPORTS OF TREES AND UTILITY LINES DOWN ACROSS JEFFERSON 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, 8.7 hours before the alert went out and 59 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.

758 
WUUS51 KPBZ 212041
SVRPBZ
PAC051-059-125-129-212130-
/O.NEW.KPBZ.SV.W.0080.210621T2041Z-210621T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
441 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...
  Central Fayette County in southwestern Pennsylvania...

* Until 530 PM EDT.

* At 441 PM EDT, severe thunderstorms were located along a line
  extending from near West Newton to Brownsville, 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...
  Uniontown...                      Connellsville...
  Waynesburg...                     California...
  Scottdale...                      Masontown...
  Brownsville...                    Fredericktown-Millsboro...
  South Connellsville...            Perryopolis...
  Fairdale...                       Jefferson Boro...

This includes Interstate 79 in Pennsylvania between mile markers 13
and 20.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
These storms are producing widespread wind damage. Seek shelter
inside a sturdy structure 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 4006 7938 3989 7950 3980 7984 3993 8030
      4014 7976
TIME...MOT...LOC 2041Z 281DEG 41KT 4020 7973 3999 7988 

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

3 follow-up statements

949 
WWUS51 KPBZ 212105
SVSPBZ

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

PAC125-212115-
/O.CAN.KPBZ.SV.W.0080.000000T0000Z-210621T2130Z/
Washington PA-
505 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON 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 Pennsylvania.

LAT...LON 3985 8001 4000 7986 4012 7968 4006 7938
      3989 7950 3980 7984
TIME...MOT...LOC 2105Z 281DEG 41KT 4015 7941 3994 7956 

$$

PAC051-059-129-212130-
/O.CON.KPBZ.SV.W.0080.000000T0000Z-210621T2130Z/
Westmoreland PA-Greene PA-Fayette PA-
505 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHWESTERN WESTMORELAND...EAST CENTRAL GREENE AND CENTRAL
FAYETTE COUNTIES...

At 505 PM EDT, severe thunderstorms were located along a line
extending from 7 miles east of Mount Pleasant to near South
Connellsville, 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...
Uniontown...                      Connellsville...
Scottdale...                      Masontown...
South Connellsville...            Perryopolis...
Fairdale...                       Fairchance...
Dunbar...                         Smithfield...
Everson...                        Republic...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
These storms are producing widespread wind damage. Seek shelter
inside a sturdy structure 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 3985 8001 4000 7986 4012 7968 4006 7938
      3989 7950 3980 7984
TIME...MOT...LOC 2105Z 281DEG 41KT 4015 7941 3994 7956 

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

775 
WWUS51 KPBZ 212114
SVSPBZ

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

PAC059-129-212123-
/O.CAN.KPBZ.SV.W.0080.000000T0000Z-210621T2130Z/
Westmoreland PA-Greene PA-
514 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WESTMORELAND AND
EAST CENTRAL GREENE 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 Pennsylvania.

LAT...LON 3985 7984 3994 7976 4003 7976 3998 7944
      3989 7950 3983 7972
TIME...MOT...LOC 2113Z 281DEG 41KT 4014 7932 3993 7947 

$$

PAC051-212130-
/O.CON.KPBZ.SV.W.0080.000000T0000Z-210621T2130Z/
Fayette PA-
514 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR CENTRAL FAYETTE COUNTY...

At 513 PM EDT, severe thunderstorms were located along a line
extending from 7 miles north of Seven Springs to 7 miles southeast of
South Connellsville, 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...
Uniontown...                      Connellsville...
South Connellsville...            Fairchance...
Dunbar...                         Mill Run...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms have a history of producing damaging wind gusts. Move
indoors immediately and stay away from windows!
 
These storms are producing widespread wind damage. Seek shelter
inside a sturdy structure 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 3985 7984 3994 7976 4003 7976 3998 7944
      3989 7950 3983 7972
TIME...MOT...LOC 2113Z 281DEG 41KT 4014 7932 3993 7947 

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

144 
WWUS51 KPBZ 212121
SVSPBZ

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

PAC051-212131-
/O.EXP.KPBZ.SV.W.0080.000000T0000Z-210621T2130Z/
Fayette PA-
521 PM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FAYETTE COUNTY WILL
EXPIRE AT 530 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
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 Pennsylvania.

LAT...LON 3985 7984 3994 7976 4003 7976 3998 7944
      3989 7950 3983 7972
TIME...MOT...LOC 2121Z 281DEG 41KT 4013 7923 3992 7938 

$$

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, 4:18 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, 4:43 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.