Public Information Statement
Issued by NWS Cheyenne, WY

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NEZ002-003-019>021-054-055-095-096-WYZ101>119-211115-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
513 PM MDT Tue Jun 20 2017

...PUBLIC INFORMATION STATEMENT...

...NWS Damage Survey For 06/12/17 Tornado Event Update 4...
...Added Tornado in Southern Banner County...
...Adjusted Time of Tornado 9 Miles North of Bushnell...

.OVERVIEW...
One of the most significant severe weather outbreaks to affect
southeast Wyoming and the western Nebraska Panhandle in the past
30 years occurred on the afternoon and early evening of Monday 12
June 2017. Numerous reports of tornadoes, very large hail, and
damaging winds were received by the National Weather Service. As
the afternoon progressed into the evening, severe storms increased
in  overage and intensity for areas along and east of Interstate 25
moving north and northeast across the eastern Wyoming Plains into
the western Nebraska Panhandle. Although 8-10 tornadoes have been
confirmed thus far with this outbreak, additional touchdowns likely
occurred over open rural areas with no damage observed.

Update #4 for this event adds information for one additional tornado
touchdown that occurred in southern Banner county. Also adjusted the
start and end time for the tornado that occurred 9 miles north of
Bushnell to reflect more accurate first hand acounts.

.Northeast Goshen County Wyoming and West Central Sioux County
Nebraska Tornado...

Rating:                 EF-2
Estimated Peak Wind:    111-135 MPH
Path Length /Statute/:  Approximately 25 Miles
Path Width /Maximum/:   500 Yards
Fatalities:             0
Injuries:               2

Start Date:             6/12/2017
Start Time:             509 PM MDT
Start Location:         15 miles north of Torrington WY
Start Lat/Lon:          42.2760 / -104.1957

End Date:               6/12/2017
End Time:               601 PM MDT
End Location:           8 miles south southwest of Harrison NE
End_Lat/Lon:            42.5830 / -103.9198

Significant tornado damage was noted at a ranch several miles north
of Torrington, WY just west of the Union Pacific railway line.
Significant damage consistent with EF-2 intensity winds was to the main
ranch residence and surrounding barns was noted. Several three quarter
ton pickup trucks were vaulted several yards by tornadic winds, with
several horse trailers rolled 50 to 100 yards and severely damaged.
Several horses at this location were seriously injured with 3 horses
killed. One person in the residence received minor head injuries.
The tornado continued northeast moving across the Nebraska state line
and at 535 PM did significant damage to a homestead 13 miles southwest
of Harrison. Damage consistent with EF-2 intensity was noted by the
survey team to the residence, as well as to surrounding trees and
outbuildings. One resident at this location was treated and released
at a local hospital for injuries incurred from flying debris in the
home. The tornado continued northeast before lifting to the south
southwest of Harrison NE before reaching Highway 29.

.Carpenter WY Tornado...

Rating:                 EF-2
Estimated Peak Wind:    111-135 MPH
Path Length /Statute/:  Approx 8 Miles
Path Width /Maximum/:   200 Yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             446 PM MDT
Start Location:         4 miles southeast of Carpenter WY
Start Lat/Lon:          41.0037 / -104.3037

End Date:               6/12/2017
End Time:               508 PM MDT
End Location:           3 miles north northwest of Carpenter WY
End_Lat/Lon:            41.0605 / -104.3236

The tornado crossed over from northern Colorado approximately 4 miles
southeast of Carpenter WY. It continued moving towards the north
northwest crossing mostly open farmland, paralleling county road 151
where it impacted 4 residences. The most significant damage observed
by the NWS assessment team was to 2 residences along County Road 151,
where a semi-attached garage was completely destroyed by EF-2
intensity winds. Damage also was observed to single family roof
structure. Additionally, numerous power poles were snapped along with
a ruptured power line.

.Eastern Laramie County Tornado...

Rating:                 EF-1
Estimated Peak Wind:    86-110 MPH
Path Length /Statute/:  1 mile
Path Width /Maximum/:   80 yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             505 PM MDT
Start Location:         10 miles south southwest Pine Bluffs WY
Start Lat/Lon:          41.0296 -104.1333

End Date:               6/12/2017
End Time:               512 PM MDT
End Location:           9 miles south southwest Pine Bluffs WY
End_Lat/Lon:            41.0482 / -104.1181

This short lived tornado touched down just north of the Colorado
state line to the southwest of Pine Bluffs along County Road 161
moving northeast before lifted southwest of Pine Bluffs. A fifth-wheel
horse trailer was lofted into the air for 50 yards sustaining significant
damage. A small farm outbuilding was also destroyed.

.Bayard NE Tornado...

Rating:                 EF-1
Estimated Peak Wind:    86-110 MPH
Path Length /Statute/:  1 mile
Path Width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             713 PM MDT
Start Location:         Northeast Side of Bayard NE
Start Lat/Lon:          41.76486 / -103.32235

End Date:               6/12/2017
End Time:               718 PM MDT
End Location:           .5 mile east of Bayard NE
End_Lat/Lon:            41.76551 / -103.31774

A brief tornado touchdown occurred on the east side of Bayard NE
producing damage consistent of EF-1 to the Chimney Rock Villa Nursing
Home. The tornado lifted quickly as it moved east of Bayard. Many
irrigation pivots were overturned within 1-2 miles west of Bayard and
damage on the west side of town was consistent with straight line winds.

.North Bayard to south of Alliance NE Tornado...

Rating:                 EF-2
Estimated Peak Wind:    111-135 MPH
Path Length /Statute/:  39 miles (discontinuous)
Path Width /Maximum/:   500 yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             719 PM MDT
Start Location:         4 miles north northwest of Bayard NE
Start Lat/Lon:          41.82187 / -103.34078

End Date:               6/12/2017
End Time:               825 PM MDT
End Location:           8 miles east southeast of Alliance NE
End_Lat/Lon:            42.07373 / -102.70337

A long-track discontinuous tornado path was surveyed by NWS damage
team, initially touching down northwest of the Highway 26 and L62A
intersection 4 miles north northwest of Bayard NE. The tornado continued
east along and north of L62A. Significant damage consistent with a EF-2
tornado was observed to a farmhouse approximately 6 miles northeast of
Bayard. The house was severely damaged with roof taken off and numerous
exterior walls destroyed. A detached garage was swept clean with several
trucks slid from their original location. A flat bed and horse trailer
was lofted 100 yards from their original position. Trees to the west of
the residence were denuded consistent with EF-2 strength tornado. This
storm produced additional damage some of which was due to straight-line
winds along L62A, with damage to a steel farm outbuilding, rolled mobile
home, rolled semi tractor trailer, rolled center pivots, and continued
damage to trees. The storm lifted northeast near Highway 385 with
additional damage surveyed in the Angora area, including downed power
poles and train derailment. This storm continued northeast producing
additional EF-1 to ranch outbuildings and a warehouse at the Alliance
Airport, located 4 miles southeast of the city. The storm continued
east to the Box Butte/Sheridan County line.

.11 Miles Northeast of Cheyenne Tornado...

Rating:                 EF-0
Estimated Peak Wind:    65-85 MPH
Path Length /Statute/:  0.5 miles
Path Width /Maximum/:   80 yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             440 PM MDT
Start Location:         11 miles northeast of Cheyenne
Start Lat/Lon:          41.30446 / -104.68582

End Date:               6/12/2017
End Time:               444 PM MDT
End Location:           11.5 miles northeast of Cheyenne
End_Lat/Lon:            41.34456 / -104.68176

This brief tornado touchdown occurred 11 miles northeast of Cheyenne.
Damage to irrigation center pivot was observed along with window and roof
damage to a rural residence. Minor damage was also noted to outbuildings.

.9 Miles North of Bushnell Tornado...

Rating:                 EF-1
Estimated Peak Wind:    86-110 MPH
Path Length /Statute/:  1 mile
Path Width /Maximum/:   80 yards
Fatalities:             0
Injuries:               0

Start Date:             6/12/2017
Start Time:             601 PM MDT
Start Location:         9 miles north northeast of Bushnell
Start Lat/Lon:          41.36826 / -103.88183

End Date:               6/12/2017
End Time:               608 PM MDT
End Location:           10 miles north of Bushnell
End_Lat/Lon:            41.37552 / -103.89771

Another brief tornado touchdown. Roof of old barn was tore off and exterior
walls collapsing. Auger cart and auger were tipped. Power poles broke
near the farm. Start and end times were adjusted based on eye witness accounts.

.7 Miles Southeast of Harrisburg Tornado...

Rating: EF-1
Estimated Peak Wind: 86-110 MPH
Path Length /Statute/:4 miles
Path Width /Maximum/: 100 yards
Fatalities: 0
Injuries: 0

Start Date:             6/12/2017
Start Time:             630 PM MDT
Start Location:         7 miles southeast of Harrisburg
Start Lat/Lon:          41.48689 / -103.63999

End Date:               6/12/2017
End Time:               640 PM MDT
End Location:           7 miles east of Harrisburg
End_Lat/Lon:            41.54254 / -103.60804

Short-lived tornado touched down east of Highway 71 southeast of
Harrisburg Nebraska. A Calving barn was moved about 10 yards from its
original location. One horse was killed with several others injured.
Several power poles broke. Grain bin pushed off its foundation, landing
east into grove of trees. Pole barn rolled with only a few walls left
standing.

.Southern Banner County Tornado...

Rating: EF-UNKNOWN
Estimated Peak Wind: UNKNOWN
Path Length /Statute/:1 mile
Path Width /Maximum/: UNKNOWN
Fatalities: 0
Injuries: 0

Start Date:             6/12/2017
Start Time:             612 PM MDT
Start Location:         13 miles southwest of Harrisburg
Start Lat/Lon:          41.3973 / -103.9655

End Date:               6/12/2017
End Time:               640 PM MDT
End Location:           13 miles southwest of Harrisburg
End_Lat/Lon:            41.4048 / -103.9768

An eye witness account of a short-lived tornado touched down near County Road 9
along the Banner and Kimball County lines. No damage was reported with this
tornado.

The information in this statement is preliminary and subject to
change pending final review of the events and publication in NWS
storm data.

$$


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