Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 151, NWS Pittsburgh, PA

July 13, 20215 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 13, 2021, 4:47 PM EDT for 5 counties in Pennsylvania. It was in force for 43 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: Jul 13, 2021, 4:47 PM EDT (20:47 UTC)
Expired: Jul 13, 2021, 5:30 PM EDT
In force: 43 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, Forest County, PA, Jefferson County, PA, Venango County, PA

The radar

The State College radar (KCCX), 109 km from the middle of the area, began a volume at 20:50 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 13, 4:55 PM EDT	TSTM WND DMG	Clarion, PA	TREE DOWN ON WOOD STREET
Jul 13, 5:01 PM EDT	TSTM WND DMG	Strattanville, PA	TREE DOWN ON WASHINGTON RD.
Jul 13, 5:19 PM EDT	TSTM WND DMG	Marienville, PA	TREES DOWN ON STATE ROUTE 66
Jul 13, 5:26 PM EDT	TSTM WND DMG	Sigel, PA	TREE DOWN ON ROUTE 36

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 13, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 8.8 hours before the alert went out and 133 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: 107 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 980 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

428 
WUUS51 KPBZ 132047
SVRPBZ
PAC005-031-053-065-121-132130-
/O.NEW.KPBZ.SV.W.0151.210713T2047Z-210713T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pittsburgh PA
447 PM EDT Tue Jul 13 2021

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Southeastern Venango County in northwestern Pennsylvania...
  Northwestern Jefferson County in west central Pennsylvania...
  Northeastern Armstrong County in west central Pennsylvania...
  Clarion County in west central Pennsylvania...
  Central Forest County in northwestern Pennsylvania...

* Until 530 PM EDT.

* At 447 PM EDT, a severe thunderstorm was located near Clarion,
  moving northeast 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...
  Clarion...                        Marienville...
  Knox...                           Strattanville...
  Limestone...                      Shippenville...
  Corsica...                        Sigel...
  Fryburg...                        Kellettville...
  Fisher...                         Leeper...

This includes Interstate 80 in Pennsylvania between mile markers 46
and 75.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is 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 4153 7910 4145 7896 4144 7896 4144 7897
      4145 7898 4145 7906 4142 7907 4142 7909
      4134 7909 4135 7908 4135 7902 4138 7897
      4136 7895 4099 7939 4113 7950 4119 7969
      4131 7962 4156 7934
TIME...MOT...LOC 2047Z 221DEG 34KT 4130 7937 

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

1 follow-up statement

294 
WWUS51 KPBZ 132116
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
516 PM EDT Tue Jul 13 2021

PAC005-132125-
/O.CAN.KPBZ.SV.W.0151.000000T0000Z-210713T2130Z/
Armstrong PA-
516 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ARMSTRONG COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northwestern and west central Pennsylvania.

LAT...LON 4153 7910 4145 7896 4144 7896 4144 7897
      4145 7898 4145 7906 4142 7907 4142 7909
      4134 7909 4135 7908 4135 7902 4138 7897
      4136 7895 4105 7931 4119 7946 4126 7965
      4131 7962 4156 7934
TIME...MOT...LOC 2115Z 221DEG 34KT 4151 7913 

$$

PAC031-053-065-121-132130-
/O.CON.KPBZ.SV.W.0151.000000T0000Z-210713T2130Z/
Venango PA-Jefferson PA-Clarion PA-Forest PA-
516 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHEASTERN VENANGO...NORTHWESTERN JEFFERSON...NORTHEASTERN
CLARION AND CENTRAL FOREST COUNTIES...

At 515 PM EDT, a severe thunderstorm was located over Marienville,
moving northeast 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...
Clarion...                        Marienville...
Knox...                           Strattanville...
Limestone...                      Shippenville...
Corsica...                        Sigel...
Fryburg...                        Kellettville...
Fisher...                         Leeper...

This includes Interstate 80 in Pennsylvania between mile markers 57
and 75.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is 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 4153 7910 4145 7896 4144 7896 4144 7897
      4145 7898 4145 7906 4142 7907 4142 7909
      4134 7909 4135 7908 4135 7902 4138 7897
      4136 7895 4105 7931 4119 7946 4126 7965
      4131 7962 4156 7934
TIME...MOT...LOC 2115Z 221DEG 34KT 4151 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 12, 8:00 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	30 min
Jul 13, 3:23 AM EDT	Special Weather Statement	PBZ	Washington	37 min
Jul 13, 3:37 AM EDT	Severe Thunderstorm Warning	PBZ	Washington	22 min
Jul 13, 3:53 AM EDT	Special Weather Statement	PBZ	Allegheny	37 min
Jul 13, 4:06 AM EDT	Special Weather Statement	PBZ	Westmoreland	24 min
Jul 13, 4:10 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Westmoreland	35 min
Jul 13, 4:17 AM EDT	Special Weather Statement	PBZ	Armstrong	28 min
Jul 13, 4:41 AM EDT	Special Weather Statement	PBZ	Indiana	34 min
Jul 13, 5:24 AM EDT	Special Weather Statement	PBZ	Indiana	36 min
Jul 13, 3:04 PM EDT	Special Weather Statement	PBZ	Lawrence	26 min
Jul 13, 3:14 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Lawrence, Mercer	31 min
Jul 13, 3:25 PM EDT	Severe Thunderstorm Warning	PBZ	Mercer	35 min
Jul 13, 3:36 PM EDT	Severe Thunderstorm Warning	PBZ	Butler, Mercer, Venango	39 min
Jul 13, 3:39 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Armstrong, Butler	51 min
Jul 13, 4:05 PM EDT	Severe Thunderstorm Warning	PBZ	Forest, Mercer, Venango	40 min
Jul 13, 4:11 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	49 min
Jul 13, 4:14 PM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Butler, Lawrence	31 min
Jul 13, 4:25 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Indiana, Jefferson	50 min
Jul 13, 4:41 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Butler, Clarion, Venango	34 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Westmoreland	40 min
Jul 13, 5:00 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Venango	45 min
Jul 13, 5:08 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Jefferson	52 min
Jul 13, 5:12 PM EDT	Severe Thunderstorm Warning	PBZ	Clarion, Forest, Jefferson, Venango	48 min
Jul 13, 5:25 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson, Westmoreland	50 min
Jul 13, 5:47 PM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Fayette, Greene, Washington, Westmoreland	28 min
Jul 13, 6:08 PM EDT	Severe Thunderstorm Warning	PBZ	Indiana, Jefferson, Westmoreland	37 min
Jul 13, 6:14 PM EDT	Severe Thunderstorm Warning	PBZ	Fayette, Westmoreland	31 min
Jul 13, 6:43 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Indiana, Westmoreland	32 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.