Public Information Statement
Issued by NWS

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NOUS41 KPBZ 032049
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PAZ009-014-015-040100-

Public Information Statement
National Weather Service Pittsburgh PA
449 PM EDT Wed May 3 2017

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

...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 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 park, where extensive
tree damage was encountered. Vehicle and mobile home damage in the
Main Street and Douglas Street area appears to be 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 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 Eldorado Road in Butler County...

Location...Eldorado Road in Butler County western Pennsylvania
Date...05/01/2017
Estimated Time...256 pm
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 Route 36 in Clarion County...

Location...Route 36 in Clarion County in western Pennsylvania
Date...05/01/2017
Estimated Time...325pm EDT- 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 near 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 Near Forest Road in Clarion County...

Location...Forest Road in Clarion County in western Pennsylvania
Date...05/01/2017
Estimated Time...327pm EDT- 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 near Forest Road in Clarion County PA on 05/01/2017.

Amid widespread blowdown in the Allegheny National 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 wa been rated an 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.

$$

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