Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 90, NWS Pittsburgh, PA

June 30, 2021Allegheny County, Washington County, Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 30, 2021, 1:23 PM EDT for Allegheny County, Washington County, Westmoreland County, Pennsylvania. It was in force for 52 min. 6 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 30, 2021, 1:23 PM EDT (17:23 UTC)
Expired: Jun 30, 2021, 2:15 PM EDT
In force: 52 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Allegheny County, PA, Washington County, PA, Westmoreland County, PA

The radar

The Pittsburgh radar (KPBZ), 37 km from the middle of the area, began a volume at 17:23 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 30, 1:23 PM EDT	HAIL 0.75	Hazelwood, PA
Jun 30, 1:29 PM EDT	TSTM WND DMG	Clairton, PA	EM REPORTING SPORADIC TREES AND POWER LINES DOWN THROUGHOUT COUNTY.
Jun 30, 1:31 PM EDT	TSTM WND GST 52	Allegheny County Airpor, PA
Jun 30, 1:50 PM EDT	TSTM WND DMG	2 Nne Level Green, PA	REPORT ON TREE DOWN ON ROADWAY. TIME ESTIMATED BASED ON RADAR.
Jun 30, 1:55 PM EDT	TSTM WND DMG	1 W Irwin, PA	REPORT OF TREE DOWN ON WIRES DUE TO WIND. TIME ESTIMATED BASED ON RADAR.
Jun 30, 2:04 PM EDT	TSTM WND DMG	Export, PA	REPORT OF MULTIPLE TREES DOWN AROUND THE AREA. TIME ESTIMATED BASED ON RADAR.

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 30, 11:47 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 5.4 hours before the alert went out and 21 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: 807 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1240 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

238 
WUUS51 KPBZ 301723
SVRPBZ
PAC003-125-129-301815-
/O.NEW.KPBZ.SV.W.0090.210630T1723Z-210630T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
123 PM EDT Wed Jun 30 2021

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  East central Washington County in southwestern Pennsylvania...
  Southeastern Allegheny County in southwestern Pennsylvania...
  Western Westmoreland County in southwestern Pennsylvania...

* Until 215 PM EDT.

* At 123 PM EDT, a severe thunderstorm was located over Munhall, or
  near McKeesport, moving east at 25 mph.

  HAZARD...Wind gusts to 60 mph and quarter-size hail.

  SOURCE...Radar.

  IMPACT...Minor hail damage to vehicles is possible. Expect wind 
           damage to trees and power lines, resulting in some power 
           outages.

* Locations impacted include...
  Pittsburgh...                     Penn Hills...
  Mount Lebanon...                  Bethel Park...
  Monroeville...                    McMurray...
  McKeesport...                     Jeannette...
  Gastonville...                    Plum...
  West Mifflin...                   Baldwin...

This includes the following highways...
  Interstate 70 in Pennsylvania between mile markers 50 and 56.
  Pennsylvania Turnpike between mile markers 51 and 74.
  Interstate 79 in Pennsylvania near mile marker 50.
  Interstate 376 in Pennsylvania between mile markers 74 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4031 8016 4056 7971 4044 7955 4017 7963
      4017 8004
TIME...MOT...LOC 1723Z 277DEG 24KT 4038 7988 

HAIL...1.00IN
WIND...60MPH
 
$$

2 follow-up statements

180 
WWUS51 KPBZ 301807
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
207 PM EDT Wed Jun 30 2021

PAC003-125-129-301815-
/O.CON.KPBZ.SV.W.0090.000000T0000Z-210630T1815Z/
Washington PA-Allegheny PA-Westmoreland PA-
207 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR EAST CENTRAL WASHINGTON...SOUTHEASTERN ALLEGHENY AND SOUTHWESTERN
WESTMORELAND COUNTIES...

At 206 PM EDT, a severe thunderstorm was located near Greensburg,
moving east at 30 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...
Bethel Park...                    Monroeville...
McKeesport...                     Jeannette...
Gastonville...                    Plum...
West Mifflin...                   Baldwin...
Murrysville...                    Whitehall...

This includes the following highways...
  Interstate 70 in Pennsylvania between mile markers 50 and 56.
  Pennsylvania Turnpike between mile markers 55 and 74.
  Interstate 376 in Pennsylvania between mile markers 82 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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 4031 8006 4052 7966 4044 7955 4017 7963
      4017 8004
TIME...MOT...LOC 1806Z 277DEG 24KT 4034 7950 

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

908 
WWUS51 KPBZ 301814
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
214 PM EDT Wed Jun 30 2021

PAC003-125-129-301823-
/O.EXP.KPBZ.SV.W.0090.000000T0000Z-210630T1815Z/
Washington PA-Allegheny PA-Westmoreland PA-
214 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WASHINGTON...
SOUTHEASTERN ALLEGHENY AND SOUTHWESTERN WESTMORELAND COUNTIES WILL
EXPIRE AT 215 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses 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 this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southwestern Pennsylvania. A Severe Thunderstorm Watch also remains
in effect until 800 PM EDT for southwestern Pennsylvania.

LAT...LON 4031 8006 4052 7966 4044 7955 4017 7963
      4017 8004
TIME...MOT...LOC 1813Z 277DEG 24KT 4034 7948 

$$

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 8:02 PM EDT	Areal Flood Advisory	PBZ	Mercer, Venango	118 min
Jun 30, 12:40 PM EDT	Special Weather Statement	PBZ	Washington	50 min
Jun 30, 12:56 PM EDT	Special Weather Statement	PBZ	Allegheny	34 min
Jun 30, 1:04 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	26 min
Jun 30, 1:06 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington, Westmoreland	24 min
Jun 30, 1:19 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Washington, Westmoreland	3 hr
Jun 30, 1:29 PM EDT	Special Weather Statement	PBZ	Washington	31 min
Jun 30, 1:52 PM EDT	Special Weather Statement	PBZ	Indiana	23 min
Jun 30, 2:03 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	42 min
Jun 30, 2:12 PM EDT	Flash Flood Warning	PBZ	Allegheny, Beaver, Washington, Westmoreland	3 hr
Jun 30, 2:14 PM EDT	Flash Flood Warning	PBZ	Allegheny, Washington	2 hr
Jun 30, 2:26 PM EDT	Severe Thunderstorm Warning	PBZ	Washington	49 min
Jun 30, 2:37 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana	38 min
Jun 30, 2:41 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	34 min
Jun 30, 2:45 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	45 min
Jun 30, 3:03 PM EDT	Special Weather Statement	PBZ	Armstrong	27 min
Jun 30, 3:13 PM EDT	Special Weather Statement	PBZ	Greene	32 min
Jun 30, 3:29 PM EDT	Special Weather Statement	PBZ	Fayette	31 min
Jun 30, 3:32 PM EDT	Areal Flood Advisory	PBZ	Armstrong, Indiana	3 hr
Jun 30, 3:35 PM EDT	Special Weather Statement	PBZ	Forest	25 min
Jun 30, 3:52 PM EDT	Special Weather Statement	PBZ	Fayette	23 min
Jun 30, 3:55 PM EDT	Special Weather Statement	PBZ	Jefferson	35 min
Jun 30, 4:29 PM EDT	Special Weather Statement	PBZ	Butler	31 min
Jun 30, 5:05 PM EDT	Special Weather Statement	PBZ	Mercer	25 min
Jun 30, 5:11 PM EDT	Special Weather Statement	PBZ	Lawrence	34 min
Jun 30, 5:58 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Butler, Washington	47 min
Jun 30, 6:44 PM EDT	Special Weather Statement	PBZ	Allegheny	46 min

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.