Public Information Statement
Issued by NWS

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NOUS41 KPBZ 081751
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PAZ007>009-013>016-020>023-029-031-073>076-082200-

Public Information Statement
National Weather Service Pittsburgh PA
151 PM EDT Mon May 8 2017

...Multiple Tornadoes Confirmed on 05/01/2017...

OVERVIEW: A survey team on Saturday confirmed two additional
tornadoes in Clarion/Forest Counties in western Pennsylvania.
These two are in addition to the four previously confirmed in
Butler and Clarion Counties, bringing the total tornado count for
this storm event to six. This document summarizes the six
tornadoes that were surveyed in order by time of occurrence.


...Tornado Confirmed Near Prospect in Butler County in western
Pennsylvania...

Location...Prospect in Butler County western Pennsylvania
Date...05/01/2017
Estimated Time...230 pm to 231 pm EDT
Maximum EF-Scale Rating...EF0
Estimated Maximum Wind Speed...80-85 mph
Maximum Path Width...50 yards
Path Length...2.9 miles
Beginning Lat/Lon...40.911N / 80.076W
Ending lat/Lon...40.926N / 80.025W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado near Prospect in Butler County western Pennsylvania on
05/01/2017.

A focused, narrow path of tree damage was encountered beginning
along Portersville Road near Sechan Road. In this area, dozens of
hardwood and softwood trees were snapped or uprooted. Roofing
panels on a barn in this area were removed by the wind, and
paneling was removed from a trailer door. A home in this area that
sustained a near-direct hit by the tornado appears to have been
sheltered by surrounding trees and suffered only minor damage.

The tornado then moved through a mobile home community, where extensive
tree damage was encountered. Vehicle and mobile-home damage in the
Main Street and Douglas Street area appears to have been caused
predominantly by falling trees, although the wind did sweep out
foundational siding.

The tornado then weakened (with pockets of focused damage) while
it continued to the area of Grindle Road and Election House Road,
where modest damage was sustained at a greenhouse property. Among
other damage at this site, a large container was lofted and
transported several tens of feet over a greenhouse structure.

Several photographs of a tornado in this area have been appearing
on social media outlets, but as of this time, the NWS has not been
able to authenticate any of the photographs claiming to depict
this tornado. Appreciation is extended to Butler County Emergency
Management Agency, the public and news media for providing
important details to the survey team.

This information also can be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

&&

...Tornado Confirmed along Eldorado Road in Butler County...

Location...Eldorado Road in Butler County western Pennsylvania
Date...05/01/2017
Estimated Time...256 pm - 257 pm EDT
Maximum EF-Scale Rating...EF0
Estimated Maximum Wind Speed...65-70 mph
Maximum Path Width...50 yards
Path Length...0.4 miles
Beginning Lat/Lon...41.092N / 79.732W
Ending lat/Lon...41.097N / 79.729W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado near Eldorado Road in Butler County on 05/01/2017.

A NWS survey team encountered an unreported short, focused path of
concentrated tree damage along East Eldorado Road. Hardwood Trees
in this area were snapped or uprooted in a short and narrow
convergent path, consistent with a brief EF0 tornado.

This information can also be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

&&

...Tornado Confirmed near Wentlings Corners in Clarion County...

NOTE: This is a newly-confirmed tornado.

Location...Wentlings Corners in Clarion County in western Pennsylvania
Date...05/01/2017
Estimated Time...309 pm - 310pm EDT
Maximum EF-Scale Rating...EF0
Estimated Maximum Wind Speed...70-75 mph
Maximum Path Width...75 yards
Path Length...1 mile
Beginning Lat/Lon...41.189N / 79.553W
Ending lat/Lon...41.195N / 79.538W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado near Wentlings Corners in Clarion County PA on 05/01/2017.

A survey team returned to Clarion County on Saturday to evaluate
additional damage reported to NWS Pittsburgh after the May 1
storms. Damage in the Wentlings Corners area appears to have
resulted from a combination of tornadic and non-tornadic wind. A
coherent path was discovered from near Route 338 and Canoe Ripple
Road to an area north of Tippecanoe Road and east of Wentlings
Corners Road.

The damage observed during the survey mainly was to trees,
although residents of the area have provided photographic evidence
of shingle removal from outbuildings and displaced items that are
not part of the set of official damage indicators used during
storm damage surveys. Structural damage that was identified to the
survey team appeared to have resulted indirectly from falling and
flying debris. Photographs provided via social media to the NWS
appear to depict a partial funnel cloud and rain curtains in the
area where damage was sustained.

Additional damage and extreme wind were reported in the area of
Huckleberry Ridge Road/Providence Church Road, but the team could
identify no coherent track in this area. Wind in this area
nevertheless likely reached damaging speed, but the lack of a
coherent track and radar imagery suggest that this wind likely was
associated with a localized surge in outflow to the east of the
tornadic portion of the storm.

This information is preliminary pending any additional data
provided to the NWS. Appreciation is extended to residents of the
Knox area, who provided the NWS with extensive damage
documentation and storm photographs that have helped the survey
team in its efforts.

This information can also be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

&&

...Tornado Confirmed along Route 36 in Clarion County...

Location...Route 36 in Clarion County in western Pennsylvania
Date...05/01/2017
Estimated Time...325 pm - 326pm EDT
Maximum EF-Scale Rating...EF0
Estimated Maximum Wind Speed...80 mph
Maximum Path Width...100 yards
Path Length...0.6 miles
Beginning Lat/Lon...41.331N / -79.255W
Ending lat/Lon...41.335N / -79.246W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado along Route 36 in Clarion County PA on 05/01/2017.

A NWS survey team encountered a focused path of concentrated tree
damage that began in the woods along Gravel Lick Road and
continued across Route 36 into a forested area. Toward the end of
the path, the damage width widened and showed clear indications
of convergent rotation. Dozens of softwood trees in this area were
snapped as the brief tornado raced northeastward. Appreciation is
extended to Clarion County Emergency Management for their
cooperation with the survey team.

This information can also be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

&&

...Tornado Confirmed in Cook Forest in Clarion County...

NOTE:  The previous statement incorrectly referenced Allegheny
National Forest.  The tornado occurred in Cook Forest State Park.

Location...Forest Road in Clarion County in western Pennsylvania
Date...05/01/2017
Estimated Time...327pm - 328pm EDT
Maximum EF-Scale Rating...EF0
Estimated Maximum Wind Speed...70-75 mph
Maximum Path Width...75 yards
Path Length...0.75 miles
Beginning Lat/Lon...41.331N / -79.224W
Ending lat/Lon...41.337N / -79.212W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado along Forest Road in Clarion County PA on 05/01/2017.

Amid widespread blowdown in the Cook Forest, a NWS survey team
evaluated a narrow damage path along Forest Road, where a focused,
concentrated swath of dozens of softwood trees was snapped or
uprooted.

A blown down assessment conducted by the Park Service reveals this
surveyed damage to be the end of a convergent damage swath that began
along Fire Tower Road. As the survey team was unaware of its existence
at the time, the damage along Fire Tower Road was not examined by the
survey team and does not factor in the the wind speed estimate/rating
above.

Damage along Forest Road was consistent with a tornado producing wind of
70-75 mph, so the tornado has been rated EF0 pending any additional
information.

This information can also be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

&&

...Tornado Confirmed near Newmansville in Clarion and Forest Counties...

NOTE: This is a newly-confirmed tornado.

Location...Pine Hollow Road in Clarion County to Guitonville Road in
           Forest County in western Pennsylvania
Date...05/01/2017
Estimated Time...327 pm - 331pm EDT
Maximum EF-Scale Rating...EF1
Estimated Maximum Wind Speed...90-100 mph
Maximum Path Width...100 yards
Path Length...2.4 miles
Beginning Lat/Lon...41.408N / 79.355W
Ending lat/Lon...41.438N / 79.339W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Pittsburgh PA has confirmed a
tornado near Newmansville in Clarion and Forest Counties PA on
05/01/2017.

Two distinct, tornadic damage swaths seemingly associated with
one parent mesocyclone were discovered beginning along Pine Hollow
Road in northern Clarion County.

A survey team examined damage along Red Pine Circle and Pine
Hollow Road in northern Clarion County. The team discovered a
coherent, convergent track of tree damage that began in a field to
the west of Red Pine Circle and carved a focused swath through
trees at the northwestern corner of the Red Pine Circle loop.
Hardwood and softwood trees were snapped and uprooted in this
area, with damage sustained to several cabins from falling trees.
Nearly every tree within the 100 yd-wide swath sustained some
degree of damage.

To the south of the tornado track, additional tree damage was
discovered that is consistent with a broader swath of non-tornadic
wind. Sporadic, snapped large limbs and a few uproots were found
along the southern stretch of Red Pine Circle and the southern
portion of Pine Hollow Road.

A distinct track within the same parent mesocyclone crossed Pine
Hollow Road near Kerr Drive and continued to show sporadic damage
to trees into southern Forest County before weakening along
Guitonville Road in Green Township. Direct damage along the
entirety of the track appears to be predominantly to trees, with
extensive tree devastation encountered along Pine Hollow Road. In
this area, a section of forest was leveled/snapped, representing
the most-intense wind damage encountered in all surveys conducted
for this storm system. Clarion County officials informed the team
that the road had been closed for a prolonged period following the
storm.

Tree damage along this track`s extension on Kerr Drive and across
Carll Drive continued into the wooded area to the north. Damage
with some degree of concentration also was encountered along
Guitonville Road at the geographical northward extension of this
track. While the survey team was unable to traverse the wooded
area between these two damage points to confirm their continuity,
it appears most probable that an at-least discontinuous track of
tree damage connects the two points.

This information is preliminary pending any additional data
provided to the NWS. Appreciation is extended to residents of this
area for their cooperation with the survey team and for providing
geographical details and numerous photographs that assisted the
team in its effort.

This information can also be found on our website at
weather.gov/pittsburgh.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.


$$

Kramar/TAX



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