Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 124, NWS Pittsburgh, PA

July 7, 2021Armstrong County, Clarion County, Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 7, 2021, 4:59 PM EDT for Armstrong County, Clarion County, Jefferson County, Pennsylvania. It was in force for 31 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: Jul 7, 2021, 4:59 PM EDT (20:59 UTC)
Expired: Jul 7, 2021, 5:30 PM EDT
In force: 31 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Armstrong County, PA, Clarion County, PA, Jefferson County, PA

The radar

The Pittsburgh radar (KPBZ), 94 km from the middle of the area, began a volume at 20:59 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
Jul 7, 5:00 PM EDT	TSTM WND DMG	New Bethlehem, PA	TREES DOWN IN NEW BETHLEHEM
Jul 7, 5:15 PM EDT	TSTM WND DMG	Worthville, PA	TREE DOWN ON RIVER RD AND MAIN STREET. TIME ESTIMATED BY 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
Jul 7, 3:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.0 hours before the alert went out and 96 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: 505 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

923 
WUUS51 KPBZ 072059
SVRPBZ
PAC005-031-065-072130-
/O.NEW.KPBZ.SV.W.0124.210707T2059Z-210707T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
459 PM EDT Wed Jul 7 2021

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  West central Jefferson County in west central Pennsylvania...
  East central Armstrong County in west central Pennsylvania...
  Southeastern Clarion County in west central Pennsylvania...

* Until 530 PM EDT.

* At 459 PM EDT, a severe thunderstorm was located near Clarion,
  moving northeast at 55 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...
  Clarion...                        Rimersburg...
  New Bethlehem...                  Sligo...
  Strattanville...                  Summerville...
  Limestone...                      Hawthorn...
  Corsica...                        Timblin...
  Worthville...                     Distant...

This includes Interstate 80 in Pennsylvania between mile markers 59
and 70.
 
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 4090 7933 4107 7957 4122 7944 4118 7920
      4103 7911
TIME...MOT...LOC 2059Z 219DEG 49KT 4114 7931 

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

1 follow-up statement

811 
WWUS51 KPBZ 072114
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
514 PM EDT Wed Jul 7 2021

PAC005-031-065-072130-
/O.CON.KPBZ.SV.W.0124.000000T0000Z-210707T2130Z/
Jefferson PA-Armstrong PA-Clarion PA-
514 PM EDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR WEST CENTRAL JEFFERSON...EAST CENTRAL ARMSTRONG AND SOUTHEASTERN
CLARION COUNTIES...

At 514 PM EDT, a severe thunderstorm was located 10 miles north of
Brookville, moving northeast at 55 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...
Clarion...                        New Bethlehem...
Sligo...                          Strattanville...
Summerville...                    Limestone...
Hawthorn...                       Corsica...
Worthville...                     

This includes Interstate 80 in Pennsylvania between mile markers 59
and 70.
 
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 4095 7928 4111 7951 4122 7944 4118 7920
      4103 7911
TIME...MOT...LOC 2114Z 219DEG 49KT 4130 7913 

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 1:36 PM EDT	Special Weather Statement	PBZ	Fayette	24 min
Jul 7, 1:57 PM EDT	Special Weather Statement	PBZ	Fayette	18 min
Jul 7, 2:01 PM EDT	Special Weather Statement	PBZ	Greene	14 min
Jul 7, 2:10 PM EDT	Special Weather Statement	PBZ	Westmoreland	20 min
Jul 7, 2:25 PM EDT	Severe Thunderstorm Warning	PBZ	Greene, Washington	20 min
Jul 7, 2:32 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	13 min
Jul 7, 2:42 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver	18 min
Jul 7, 2:54 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	36 min
Jul 7, 2:58 PM EDT	Special Weather Statement	PBZ	Allegheny	32 min
Jul 7, 2:59 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	31 min
Jul 7, 3:01 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	29 min
Jul 7, 3:13 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	32 min
Jul 7, 3:19 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington, Westmoreland	26 min
Jul 7, 3:26 PM EDT	Flash Flood Warning	PBZ	Allegheny, Armstrong, Fayette, Washington, Westmoreland	2 hr
Jul 7, 3:36 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	24 min
Jul 7, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler, Westmoreland	30 min
Jul 7, 3:47 PM EDT	Special Weather Statement	PBZ	Beaver	28 min
Jul 7, 3:53 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny	37 min
Jul 7, 4:01 PM EDT	Severe Thunderstorm Warning	PBZ	Butler	29 min
Jul 7, 4:21 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Lawrence	39 min
Jul 7, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion	32 min
Jul 7, 4:33 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	27 min
Jul 7, 4:35 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	25 min
Jul 7, 4:40 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	13 min
Jul 7, 4:58 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer, Venango	47 min
Jul 7, 5:01 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Jefferson	29 min
Jul 7, 5:06 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	24 min
Jul 7, 5:20 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer, Venango	25 min
Jul 7, 5:24 PM EDT	Areal Flood Advisory	PBZ	Allegheny, Washington, Westmoreland	111 min
Jul 7, 5:24 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson	51 min
Jul 7, 6:40 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene	20 min
Jul 7, 7:19 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Washington	26 min
Jul 7, 7:22 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	23 min
Jul 7, 7:33 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Greene, Washington	27 min
Jul 7, 7:37 PM EDT	Severe Thunderstorm Warning	PBZ	Greene	23 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.