Alert archive / Pennsylvania / Tornado Warnings in 2021
Tornado Warning 17, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this tornado warning at Sep 22, 2021, 6:04 PM EDT for Butler County, Venango County, Pennsylvania. It was in force for 12 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
- Sep 22, 2021, 6:04 PM EDT (22:04 UTC)
- Expired
- Sep 22, 2021, 6:16 PM EDT
- In force
- 12 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Butler County, PA, Venango County, PA
The radar
The Pittsburgh radar (KPBZ), 79 km from the middle of the area, began a volume at 22:07 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 |
|---|---|---|---|
| Sep 22, 2:23 PM EDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 10.1 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.
- Mixed-layer CAPE
- 155 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 634 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted.
418
WFUS51 KPBZ 222204
TORPBZ
PAC019-121-222230-
/O.NEW.KPBZ.TO.W.0017.210922T2204Z-210922T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pittsburgh PA
604 PM EDT Wed Sep 22 2021
The National Weather Service in Pittsburgh has issued a
* Tornado Warning for...
Southwestern Venango County in northwestern Pennsylvania...
North central Butler County in west central Pennsylvania...
* Until 630 PM EDT.
* At 603 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Grove City, moving north at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This tornadic thunderstorm will remain over mainly rural areas of
southwestern Venango and north central Butler Counties, including
the following locations... Kennerdell, Clintonville, Barkeyville
and Harrisville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4128 7977 4111 7994 4113 8001 4117 8001
4117 8000 4120 8000 4131 7999
TIME...MOT...LOC 2203Z 197DEG 27KT 4116 7996
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$2 follow-up statements
545
WWUS51 KPBZ 222212
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
612 PM EDT Wed Sep 22 2021
PAC019-222222-
/O.CAN.KPBZ.TO.W.0017.000000T0000Z-210922T2230Z/
Butler PA-
612 PM EDT Wed Sep 22 2021
...THE TORNADO WARNING FOR NORTH CENTRAL BUTLER COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 1000 PM EDT for northwestern
Pennsylvania.
LAT...LON 4129 7984 4118 7993 4118 8000 4131 7999
TIME...MOT...LOC 2212Z 197DEG 27KT 4123 7993
$$
PAC121-222230-
/O.CON.KPBZ.TO.W.0017.000000T0000Z-210922T2230Z/
Venango PA-
612 PM EDT Wed Sep 22 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
SOUTHWESTERN VENANGO COUNTY...
At 612 PM EDT, a severe thunderstorm capable of producing a tornado
was located 9 miles northeast of Grove City, moving north at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Barkeyville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4129 7984 4118 7993 4118 8000 4131 7999
TIME...MOT...LOC 2212Z 197DEG 27KT 4123 7993
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$532
WWUS51 KPBZ 222216
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
616 PM EDT Wed Sep 22 2021
PAC121-222226-
/O.CAN.KPBZ.TO.W.0017.000000T0000Z-210922T2230Z/
Venango PA-
616 PM EDT Wed Sep 22 2021
...THE TORNADO WARNING FOR SOUTHWESTERN VENANGO COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled. However gusty winds are
still possible with this thunderstorm.
A Tornado Watch remains in effect until 1000 PM EDT for northwestern
Pennsylvania.
LAT...LON 4129 7984 4118 7993 4118 8000 4131 7999
TIME...MOT...LOC 2215Z 197DEG 27KT 4126 7992
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 4:25 PM EDT | Special Weather Statement | PBZ | Beaver | 35 min |
| Sep 22, 4:53 PM EDT | Special Weather Statement | PBZ | Allegheny, Beaver, Butler | 37 min |
| Sep 22, 5:25 PM EDT | Special Weather Statement | PBZ | Butler | 35 min |
| Sep 22, 5:43 PM EDT | Tornado Warning | PBZ | Armstrong, Butler | 18 min |
Nearby
Tornado Warnings in Pennsylvania, 2021Every tornado warning in 2021Tornadoes 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.