A line of showers and embedded thunderstorms made its way slowly southward ahead of  a frontal boundary on the afternoon of the 16th.  Although instability was not especially high, an area of shear and helicity ahead of the front supported a period of rotating thunderstorm cells.  Three brief tornadoes were recorded in southwest Pennsylvania, although with a few other instances of wind damage.  The tornadoes mainly produced tree damage, with some minor structural damage noted.

Tornado in MERCER, PENNSYLVANIA
From 16-JUN-19 16:03:00 to 16-JUN-19 16:05:00 (EST-5)
Location: SHARON
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Direct damage primarily to trees was noted from the OH/PA state
line near Bell Street across the Shenango River into the towns of
Sharon and Farrell, PA.
A PennDOT trailer was tipped over early in the tornado's track
into Mercer County. Thereafter, damage was wholly to trees. Trees
were snapped, uprooted or topped along Stewart Avenue, Malleable
Street, and South Oakland Avenue near George and Morrison Streets.
A tree was blown down onto a house in this last area, where the
roof and brick chimney were damaged.
Wind damage in Mercer County was consistent with maximum wind
speed of 75-80 mph, which would categorize this segment of the
track as EF0. However, this tornado is a continuation of the EF1
tornado track from Trumbull County, and so its comprehensive rating will be EF1 based on the earlier damage in Ohio.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 16-JUN-19 17:06:00 to 16-JUN-19 17:06:00 (EST-5)
Location: ANNISVILLE
Magnitude: 50.00 EG
Reported by: NWS Storm Survey

Trees were observed to have been blown down near Oneida Valley Road.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 16-JUN-19 17:14:00 to 16-JUN-19 17:14:00 (EST-5)
Location: BRUIN
Magnitude: 50.00 EG
Reported by: NWS Storm Survey

Trees were observed to be blown down near East Eldorado Road.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 16-JUN-19 18:03:00 to 16-JUN-19 18:03:00 (EST-5)
Location: OAK RIDGE
Magnitude: 50.00 EG
Reported by: Fire Department/Rescue

Trees and power lines were reported to be blown down near Oak Hill Road.

Thunderstorm Wind in ARMSTRONG, PENNSYLVANIA
From 16-JUN-19 18:08:00 to 16-JUN-19 18:08:00 (EST-5)
Location: NEW SALEM
Magnitude: 50.00 EG
Reported by: Social Media

Trees were reported to be blown down along route T793.

Thunderstorm Wind in BUTLER, PENNSYLVANIA
From 16-JUN-19 17:18:00 to 16-JUN-19 17:18:00 (EST-5)
Location: BONUS
Magnitude: 50.00 EG
Reported by: NWS Employee

Trees were uprooted with structural damage noted near Kitanning Pike.

Tornado in INDIANA, PENNSYLVANIA
From 16-JUN-19 18:55:00 to 16-JUN-19 18:57:00 (EST-5)
Location: COMMODORE
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Damage started near the railroad tracks parallel to Vanderbilt
Street, where several hardwood and softwood trees were uprooted or
snapped. This continued into a wooded area between the railroad
tracks and Walnut Road to the east-northeast. At least 2 dozen
more trees were uprooted, snapped half way up, or broken at the
trunk. At this point, the storm passed through a field, though
sporadic damage to trees was noted along the field opening and the
forest. The tornado then crossed over Walnut Road, snapping a
very large pine tree near the base of the trunk, and also tossed
the top of another tree down a slope near a home. Minor shingle
and roof damage were noted to the barn adjacent to the aforementioned
house, where these pieces were found back south and west of the
home. The tornado lifted at this point.

Tornado in BUTLER, PENNSYLVANIA
From 16-JUN-19 17:18:00 to 16-JUN-19 17:21:00 (EST-5)
Location: BONUS
Tornado F-scale: EF1
Reported by: NWS Storm Survey

The damage started on Parker Pike Road where numerous hardwood
and softwood trees (close to 100) where either uprooted, snapped
at the trunk, or broken halfway up. The storm continued to cause tree damage as it crossed Division Road, at which point the tornado crossed into Armstrong County.  The maximum wind speed was estimated to be 105 MPH.

Tornado in ARMSTRONG, PENNSYLVANIA
From 16-JUN-19 17:21:00 to 16-JUN-19 17:23:00 (EST-5)
Location: PARKER CITY
Tornado F-scale: EF1
Reported by: NWS Storm Survey

As the tornado crossed from Butler County into Armstrong County near the city of Parker,
structural damage was reported as a storage trailer was overturned,
an exterior detached garage lost most of its roof, and a wall
from a truck wash was blown out. There was extensive tree damage,
with trees on homes along Century Street. The storm lifted as it approached the Allegheny River.  The maximum wind speed of the tornado was estimated to be 105 MPH.