Alert archive / Pennsylvania / Tornado Warnings in 2021
Tornado Warning 25, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this tornado warning at Oct 21, 2021, 7:24 PM EDT for Butler County, Pennsylvania. It was in force for 36 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
- Oct 21, 2021, 7:24 PM EDT (23:24 UTC)
- Expired
- Oct 21, 2021, 8:00 PM EDT
- In force
- 36 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Butler County, PA
The radar
The Pittsburgh radar (KPBZ), 44 km from the middle of the area, began a volume at 23:24 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 |
|---|---|---|---|
| Oct 21, 7:33 PM EDT | TORNADO | Greenwood Village, PA | EF0 TORNADO CONFIRMED WITH DISCONTINUOUS TRACK NORTH OF BUTLER. NUMEROUS TREES WERE SNAPPED AND UPROOTED AMONGST OTHER DAMAGE SEEN. |
| Oct 21, 7:35 PM EDT | TSTM WND DMG | 1 E Greenwood Village, PA | CHASER REPORTED POWER FLASHES FROM LIKELY TORNADO ALONG HWY 422. VIDEO SHOWS TREE DEBRIS ALONG 422 JUST EAST OF N DUFFY RD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 11.4 hours before the alert went out and 52 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1175 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
970
WFUS51 KPBZ 212324
TORPBZ
PAC019-220000-
/O.NEW.KPBZ.TO.W.0025.211021T2324Z-211022T0000Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pittsburgh PA
724 PM EDT Thu Oct 21 2021
The National Weather Service in Pittsburgh has issued a
* Tornado Warning for...
Central Butler County in west central Pennsylvania...
* Until 800 PM EDT.
* At 723 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Zelienople, or 9 miles west of Butler, moving east
at 35 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 dangerous storm will be near...
Meridian around 735 PM EDT.
Homeacre-Lyndora, Shanor-Northvue and Oak Hills around 740 PM EDT.
Butler and Meadowood around 745 PM EDT.
Other locations impacted by this tornadic thunderstorm include
Chicora, Connoquenessing, East Butler, Prospect, Karns City, Moraine
State Park and Nixon.
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 4081 8009 4094 8011 4101 7971 4076 7971
TIME...MOT...LOC 2323Z 265DEG 29KT 4087 8009
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$4 follow-up statements
319
WWUS51 KPBZ 212333
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
733 PM EDT Thu Oct 21 2021
PAC019-220000-
/O.CON.KPBZ.TO.W.0025.000000T0000Z-211022T0000Z/
Butler PA-
733 PM EDT Thu Oct 21 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR CENTRAL
BUTLER COUNTY...
At 733 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Meridian, or near Butler, moving east at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Butler and Meadowood around 745 PM EDT.
Other locations impacted by this tornadic thunderstorm include
Chicora, Connoquenessing, Prospect, Karns City, East Butler and
Moraine State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4082 8004 4094 8006 4101 7971 4076 7971
TIME...MOT...LOC 2333Z 265DEG 29KT 4088 7998
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$920
WWUS51 KPBZ 212342
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
742 PM EDT Thu Oct 21 2021
PAC019-220000-
/O.CON.KPBZ.TO.W.0025.000000T0000Z-211022T0000Z/
Butler PA-
742 PM EDT Thu Oct 21 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR EAST
CENTRAL BUTLER COUNTY...
At 742 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Butler, moving east at 35 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
east central Butler County, including the following locations...
Chicora, Karns City and East Butler.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4085 7994 4095 7997 4101 7971 4082 7971
TIME...MOT...LOC 2342Z 265DEG 29KT 4089 7988
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$199
WWUS51 KPBZ 212352
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
752 PM EDT Thu Oct 21 2021
PAC019-220000-
/O.CON.KPBZ.TO.W.0025.000000T0000Z-211022T0000Z/
Butler PA-
752 PM EDT Thu Oct 21 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM EDT FOR EAST
CENTRAL BUTLER COUNTY...
At 752 PM EDT, a severe thunderstorm capable of producing a tornado
was located 7 miles east of Butler, moving east at 35 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
Locations impacted include...
Chicora.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!
Please report severe weather by calling 412-262-1988, posting to
the NWS Pittsburgh Facebook page, or using Twitter @NWSPITTSBURGH.
&&
LAT...LON 4087 7983 4093 7985 4096 7971 4086 7971
TIME...MOT...LOC 2352Z 265DEG 29KT 4090 7977
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$656
WWUS51 KPBZ 212358 RRA
SVSPBZ
Severe Weather Statement
National Weather Service Pittsburgh PA
758 PM EDT Thu Oct 21 2021
PAC019-220008-
/O.EXP.KPBZ.TO.W.0025.000000T0000Z-211022T0000Z/
Butler PA-
758 PM EDT Thu Oct 21 2021
...THE TORNADO WARNING FOR EAST CENTRAL BUTLER COUNTY WILL EXPIRE AT
800 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However gusty winds are still possible with
this thunderstorm.
LAT...LON 4087 7983 4093 7985 4096 7971 4086 7971
TIME...MOT...LOC 2358Z 265DEG 29KT 4090 7973
$$The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 21, 2:03 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer, Venango | 27 min |
| Oct 21, 2:36 PM EDT | Special Weather Statement | PBZ | Mercer, Venango | 24 min |
| Oct 21, 2:50 PM EDT | Special Weather Statement | PBZ | Lawrence | 25 min |
| Oct 21, 3:18 PM EDT | Special Weather Statement | PBZ | Butler, Lawrence | 27 min |
| Oct 21, 3:49 PM EDT | Special Weather Statement | PBZ | Clarion, Forest, Venango | 41 min |
| Oct 21, 4:08 PM EDT | Special Weather Statement | PBZ | Washington | 37 min |
| Oct 21, 4:32 PM EDT | Special Weather Statement | PBZ | Clarion, Forest, Jefferson | 43 min |
| Oct 21, 4:47 PM EDT | Special Weather Statement | PBZ | Allegheny, Washington | 43 min |
| Oct 21, 5:48 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Indiana, Jefferson | 27 min |
| Oct 21, 6:00 PM EDT | Special Weather Statement | PBZ | Lawrence, Mercer, Venango | 45 min |
| Oct 21, 6:18 PM EDT | Special Weather Statement | PBZ | Beaver | 42 min |
| Oct 21, 6:42 PM EDT | Tornado Warning | PBZ | Mercer | 18 min |
| Oct 21, 6:56 PM EDT | Tornado Warning | PBZ | Beaver, Butler, Lawrence | 19 min |
| Oct 21, 6:57 PM EDT | Tornado Warning | PBZ | Washington | 33 min |
| Oct 21, 7:13 PM EDT | Tornado Warning | PBZ | Greene, Washington | 32 min |
| Oct 21, 7:19 PM EDT | Special Weather Statement | PBZ | Allegheny, Beaver, Butler | 41 min |
| Oct 21, 7:26 PM EDT | Tornado Warning | PBZ | Washington | 34 min |
| Oct 21, 7:40 PM EDT | Tornado Warning | PBZ | Allegheny, Beaver, Westmoreland | 20 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.