Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS Pittsburgh, PA

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

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 30, 2021, 1:06 PM EDT for Allegheny County, Washington County, Westmoreland County, Pennsylvania. It was in force for 24 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 30, 2021, 1:06 PM EDT (17:06 UTC)
Expired: Jun 30, 2021, 1:30 PM EDT
In force: 24 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), 29 km from the middle of the area, began a volume at 17:05 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, 1:15 PM EDT	HAIL 1	South Side Flats, PA
Jun 30, 1:17 PM EDT	TSTM WND DMG	Arlington, PA	REPORT OF TREE AND POWERLINES DOWN ON THE 2800 BLOCK OF SARAH STREET. TIME ESTIMATED BASED ON RADAR.
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

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, 5.1 hours before the alert went out and 13 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.

089 
WUUS51 KPBZ 301706
SVRPBZ
PAC003-125-129-301730-
/O.NEW.KPBZ.SV.W.0088.210630T1706Z-210630T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
106 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...
  Central Allegheny County in southwestern Pennsylvania...
  West central Westmoreland County in southwestern Pennsylvania...

* Until 130 PM EDT.

* At 106 PM EDT, a severe thunderstorm was located over Upper St.
  Clair, or over Mount Lebanon, 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...                     Gastonville...
  Plum...                           West Mifflin...
  North Side Pittsburgh...          Baldwin...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 51 and 59.
  Interstate 79 in Pennsylvania near mile marker 47, and between 
  mile markers 49 and 60.
  Interstate 376 in Pennsylvania between mile markers 62 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4025 8016 4043 8018 4053 7973 4023 7968
TIME...MOT...LOC 1706Z 265DEG 23KT 4035 8007 

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

1 follow-up statement

593 
WWUS51 KPBZ 301714
SVSPBZ

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

PAC003-125-129-301730-
/O.CON.KPBZ.SV.W.0088.000000T0000Z-210630T1730Z/
Washington PA-Allegheny PA-Westmoreland PA-
114 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR EAST CENTRAL WASHINGTON...CENTRAL ALLEGHENY AND WEST CENTRAL
WESTMORELAND COUNTIES...

At 114 PM EDT, a severe thunderstorm was located over Castle Shannon,
or over Mount Lebanon, and is nearly stationary.

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...                     Gastonville...
Plum...                           West Mifflin...
North Side Pittsburgh...          Baldwin...

This includes the following highways...
  Pennsylvania Turnpike between mile markers 51 and 59.
  Interstate 79 in Pennsylvania near mile marker 47, and between 
  mile markers 49 and 60.
  Interstate 376 in Pennsylvania between mile markers 62 and 84.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4025 8016 4043 8018 4053 7973 4023 7968
TIME...MOT...LOC 1714Z 265DEG 23KT 4035 8002 

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

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, 1:19 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Washington, Westmoreland	3 hr
Jun 30, 1:23 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington, Westmoreland	52 min
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.