Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 150, NWS Pittsburgh, PA

July 13, 20214 counties in Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 13, 2021, 4:41 PM EDT for 4 counties in Pennsylvania. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 13, 2021, 4:41 PM EDT (20:41 UTC)
Expired: Jul 13, 2021, 5:15 PM EDT
In force: 34 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Armstrong County, PA, Butler County, PA, Clarion County, PA, Venango County, PA

The radar

The Pittsburgh radar (KPBZ), 81 km from the middle of the area, began a volume at 20:42 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.

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, 8.7 hours before the alert went out and 90 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.

747 
WUUS51 KPBZ 132041
SVRPBZ
PAC005-019-031-121-132130-
/O.NEW.KPBZ.SV.W.0150.210713T2041Z-210713T2130Z/

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

The National Weather Service in Pittsburgh has issued a

* Severe Thunderstorm Warning for...
  Southern Venango County in northwestern Pennsylvania...
  Northeastern Butler County in west central Pennsylvania...
  Northwestern Armstrong County in west central Pennsylvania...
  West central Clarion County in west central Pennsylvania...

* Until 530 PM EDT.

* At 440 PM EDT, a severe thunderstorm was located 8 miles east of
  Slippery Rock, or 10 miles southeast of Grove City, moving
  northeast at 35 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...
  Slippery Rock...                  Harrisville...
  Emlenton...                       Clintonville...
  Eau Claire...                     Kennerdell...
  Barkeyville...                    Cherry Valley...
  Boyers...                         Cranberry Township...

This includes Interstate 80 in Pennsylvania between mile markers 30
and 48.
 
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 4102 7989 4108 8006 4136 7984 4133 7959
      4130 7948
TIME...MOT...LOC 2040Z 223DEG 29KT 4108 7991 

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

3 follow-up statements

248 
WWUS51 KPBZ 132056
SVSPBZ

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

PAC005-019-031-121-132130-
/O.CON.KPBZ.SV.W.0150.000000T0000Z-210713T2130Z/
Venango PA-Butler PA-Armstrong PA-Clarion PA-
456 PM EDT Tue Jul 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR SOUTHERN VENANGO...NORTHEASTERN BUTLER...NORTHWESTERN ARMSTRONG
AND WEST CENTRAL CLARION COUNTIES...

At 456 PM EDT, a severe thunderstorm was located 13 miles west of
Knox, moving northeast at 35 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...
Emlenton...                       Clintonville...
Eau Claire...                     Kennerdell...
Barkeyville...                    Cherry Valley...
Boyers...                         Cranberry Township...

This includes Interstate 80 in Pennsylvania between mile markers 30
and 48.
 
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 4107 7982 4116 7999 4136 7984 4133 7959
      4130 7948
TIME...MOT...LOC 2056Z 223DEG 29KT 4118 7979 

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

016 
WWUS51 KPBZ 132104
SVSPBZ

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

PAC005-019-132114-
/O.CAN.KPBZ.SV.W.0150.000000T0000Z-210713T2130Z/
Butler PA-Armstrong PA-
504 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BUTLER AND
NORTHWESTERN ARMSTRONG COUNTIES 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
west central Pennsylvania.

LAT...LON 4117 7967 4124 7986 4135 7979 4133 7959
      4130 7948
TIME...MOT...LOC 2104Z 223DEG 29KT 4123 7973 

$$

PAC031-121-132130-
/O.CON.KPBZ.SV.W.0150.000000T0000Z-210713T2130Z/
Venango PA-Clarion PA-
504 PM EDT Tue Jul 13 2021

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

At 504 PM EDT, a severe thunderstorm was located 10 miles west of
Knox, moving northeast at 35 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...
Emlenton...                       Kennerdell...
Cranberry Township...             

This includes Interstate 80 in Pennsylvania between mile markers 45
and 48.
 
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 4117 7967 4124 7986 4135 7979 4133 7959
      4130 7948
TIME...MOT...LOC 2104Z 223DEG 29KT 4123 7973 

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

106 
WWUS51 KPBZ 132115
SVSPBZ

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

PAC031-121-132124-
/O.CAN.KPBZ.SV.W.0150.000000T0000Z-210713T2130Z/
Venango PA-Clarion PA-
515 PM EDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN VENANGO AND WEST
CENTRAL CLARION COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Northeastern Venango County until 545 PM.

LAT...LON 4117 7967 4124 7986 4135 7979 4133 7959
      4130 7948
TIME...MOT...LOC 2110Z 223DEG 29KT 4129 7965 

$$

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, 4:47 PM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Forest, Jefferson, Venango	43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.