Alert archive / Pennsylvania / Tornado Warnings in 2021

Tornado Warning 19, NWS Pittsburgh, PA

October 16, 2021Butler County, Pennsylvania

NWS Pittsburgh, PA issued this tornado warning at Oct 16, 2021, 6:54 AM EDT for Butler County, Pennsylvania. It was in force for 21 min. 1 report 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 16, 2021, 6:54 AM EDT (10:54 UTC)
Expired: Oct 16, 2021, 7:15 AM EDT
In force: 21 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), 53 km from the middle of the area, began a volume at 10:53 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 16, 7:04 AM EDT	TSTM WND DMG	Chicora, PA	PICTURES SHOW LARGE TREES SNAPPED NEAR THE BASE IN THE CHICORA AND KEPPELS CORNER AREA. TIME ESTIMATED BASED ON RADAR.

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 00:00Z, 10.9 hours before the alert went out and 59 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: 138 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

249 
WFUS51 KPBZ 161054
TORPBZ
PAC019-161115-
/O.NEW.KPBZ.TO.W.0019.211016T1054Z-211016T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Pittsburgh PA
654 AM EDT Sat Oct 16 2021

The National Weather Service in Pittsburgh has issued a

* Tornado Warning for...
  East central Butler County in west central Pennsylvania...

* Until 715 AM EDT.
    
* At 654 AM EDT, a severe thunderstorm capable of producing a tornado
  was located near Butler, moving northeast at 40 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 and East Butler.

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 4084 7989 4090 7988 4100 7969 4088 7969
TIME...MOT...LOC 1054Z 238DEG 33KT 4089 7983 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Bookbinder

2 follow-up statements

009 
WWUS51 KPBZ 161104
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
704 AM EDT Sat Oct 16 2021

PAC019-161115-
/O.CON.KPBZ.TO.W.0019.000000T0000Z-211016T1115Z/
Butler PA-
704 AM EDT Sat Oct 16 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 AM EDT FOR EAST
CENTRAL BUTLER COUNTY...
    
At 704 AM EDT, a severe thunderstorm capable of producing a tornado
was located 7 miles east of Shanor-Northvue, or 7 miles northeast of
Butler, moving northeast 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...
Chicora.

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.

&&

LAT...LON 4086 7982 4095 7979 4100 7969 4088 7969
TIME...MOT...LOC 1104Z 236DEG 28KT 4092 7977 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Bookbinder

819 
WWUS51 KPBZ 161113
SVSPBZ

Severe Weather Statement
National Weather Service Pittsburgh PA
713 AM EDT Sat Oct 16 2021

PAC019-161122-
/O.EXP.KPBZ.TO.W.0019.000000T0000Z-211016T1115Z/
Butler PA-
713 AM EDT Sat Oct 16 2021

...THE TORNADO WARNING FOR EAST CENTRAL BUTLER COUNTY WILL EXPIRE AT
715 AM EDT...
        
The storm which prompted the warning has weakened below severe 
limits, and has moved into Armstrong county. Therefore, the warning 
will be allowed to expire.

LAT...LON 4086 7982 4095 7979 4100 7969 4088 7969
TIME...MOT...LOC 1112Z 238DEG 33KT 4096 7970 

$$

Bookbinder

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 16, 4:52 AM EDT	Severe Thunderstorm Warning	PBZ	Beaver, Washington	38 min
Oct 16, 5:37 AM EDT	Special Weather Statement	PBZ	Beaver	38 min
Oct 16, 5:47 AM EDT	Severe Thunderstorm Warning	PBZ	Allegheny, Beaver, Washington	43 min
Oct 16, 6:07 AM EDT	Tornado Warning	PBZ	Beaver	23 min
Oct 16, 7:23 AM EDT	Special Weather Statement	PBZ	Clarion	22 min
Oct 16, 7:40 AM EDT	Severe Thunderstorm Warning	PBZ	Armstrong, Clarion, Jefferson	35 min
Oct 16, 8:13 AM EDT	Severe Thunderstorm Warning	PBZ	Jefferson	17 min

Nearby

Tornado Warnings in Pennsylvania, 2021 Every tornado warning in 2021 Tornadoes 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.