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Public Information Statement
Issued: 5:02 PM MDT Jun. 21, 2018 – National Weather Service

... NWS damage survey for 06/17/2018 tornado event- update #1...

.Update... An NWS survey team was able to identify four tornado
tracks and three areas of straight line wind damage. The most
significant straight line wind damage was about 5 1/2 miles
southwest of Big Springs when estimated 85 mph winds blew the
roof off of a machine shed and removed the roof. Several
water and feed tanks were blown as far away as one half mile.
One steel watering tank was bent in half across a fence.
There was also some damage in and around Big Springs, including
an uprooted tree that due to straight line winds estimated
to be around 70 mph. Just west of Big Springs, power poles were
leaning and large tree limbs broken in the cemetery due to
estimated 85 mph winds. North of town, an old outbuilding lost
a portion of the roof and the cinder block wall collapsed due
to estimated 80 mph winds.

.Overview... A cyclic supercell moved along a cold frontal
boundary during the afternoon and evening of June 17th. The
storm produced several short-lived tornadoes that did sporadic
damage between the town of Big Springs and about 15 miles
southwest of Tryon in McPherson County.

.Tornado #1 Deuel County tornado...

Rating: EF-1
estimated peak wind: 100 mph
path length /statute/: 2.14 miles
path width /maximum/: 162 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 3:17 PM MDT
start location: 6.3 miles west of Big Springs, NE

End date: June 17, 2018
end time: 3:28 PM MDT
end location: 4.35 miles northwest of Big Springs, NE

Survey_summary: this tornado damaged two homesteads. The first
Homestead had a pig shed that lost a portion of the roof. 2x6
beams were tossed 30 yards into the side of a garage, piercing
the side of the garage. The tornado also ripped off asphalt
shingles from a nearby outbuilding. The tornado then went on
to another farm where two full pivots were flipped, one by
the tornado and one by straight line winds. The tornado also
broke large branches off of trees.

.Tornado #2 southwest Keith County...

Rating: EF-0
estimated peak wind: 65 mph
path length /statute/: 0.1 miles
path width /maximum/: 10 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 3:50 PM MDT
start location: 6 miles NW Brule, NE

End date: June 17, 2018
end time: 3:50 PM MDT
end location: 6 miles NW Brule, NE

Survey_summary: brief touchdown in an open field confirmed by
a photograph.

.Tornado #3 northeast Keith County...

Rating: EF-0
estimated peak wind: 65 mph
path length /statute/: 0.1 miles
path width /maximum/: 10 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 5:01 PM CDT
start location: 15 miles NE Keystone, NE

End date: June 17, 2018
end time: 5:01 PM CDT
end location: 15 miles NE Keystone, NE

Survey_summary: brief touchdown in an open field confirmed by
a photograph.

.Tornado #4 McPherson County tornado...

Rating: EF-1
estimated peak wind: 100 mph
path length /statute/: 21.4 miles
path width /maximum/: 195 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 5:13 PM CDT
start location: 15 miles SW Tryon, NE

End date: June 17, 2018
end time: 5:17 PM CDT
end location: 17 miles SW Tryon, NE

Survey_summary: a rental house, and tree line was damaged by the
tornado, and it also sent a piece of wood through a Deer stand. The
tornado continued on to the northeast and hit another Homestead where
the windows were shattered, a door was blown in and door jamb
damaged while the residents attempted to hold the door shut. There
was also full flipped pivot.

Ef scale: the Enhanced Fujita scale classifies
tornadoes into the following categories.

EF0... weak... ... 65 to 85 mph
EF1... weak... ... 86 to 110 mph
EF2... strong... .111 to 135 mph
EF3... strong... .136 to 165 mph
EF4... violent... 166 to 200 mph
EF5... violent... >200 mph



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



602 PM CDT Thu Jun 21 2018 /502 PM MDT Thu Jun 21 2018/

... NWS damage survey for 06/17/2018 tornado event- update #1...

.Update... An NWS survey team was able to identify four tornado
tracks and three areas of straight line wind damage. The most
significant straight line wind damage was about 5 1/2 miles
southwest of Big Springs when estimated 85 mph winds blew the
roof off of a machine shed and removed the roof. Several
water and feed tanks were blown as far away as one half mile.
One steel watering tank was bent in half across a fence.
There was also some damage in and around Big Springs, including
an uprooted tree that due to straight line winds estimated
to be around 70 mph. Just west of Big Springs, power poles were
leaning and large tree limbs broken in the cemetery due to
estimated 85 mph winds. North of town, an old outbuilding lost
a portion of the roof and the cinder block wall collapsed due
to estimated 80 mph winds.

.Overview... A cyclic supercell moved along a cold frontal
boundary during the afternoon and evening of June 17th. The
storm produced several short-lived tornadoes that did sporadic
damage between the town of Big Springs and about 15 miles
southwest of Tryon in McPherson County.

.Tornado #1 Deuel County tornado...

Rating: EF-1
estimated peak wind: 100 mph
path length /statute/: 2.14 miles
path width /maximum/: 162 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 3:17 PM MDT
start location: 6.3 miles west of Big Springs, NE

End date: June 17, 2018
end time: 3:28 PM MDT
end location: 4.35 miles northwest of Big Springs, NE

Survey_summary: this tornado damaged two homesteads. The first
Homestead had a pig shed that lost a portion of the roof. 2x6
beams were tossed 30 yards into the side of a garage, piercing
the side of the garage. The tornado also ripped off asphalt
shingles from a nearby outbuilding. The tornado then went on
to another farm where two full pivots were flipped, one by
the tornado and one by straight line winds. The tornado also
broke large branches off of trees.

.Tornado #2 southwest Keith County...

Rating: EF-0
estimated peak wind: 65 mph
path length /statute/: 0.1 miles
path width /maximum/: 10 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 3:50 PM MDT
start location: 6 miles NW Brule, NE

End date: June 17, 2018
end time: 3:50 PM MDT
end location: 6 miles NW Brule, NE

Survey_summary: brief touchdown in an open field confirmed by
a photograph.

.Tornado #3 northeast Keith County...

Rating: EF-0
estimated peak wind: 65 mph
path length /statute/: 0.1 miles
path width /maximum/: 10 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 5:01 PM CDT
start location: 15 miles NE Keystone, NE

End date: June 17, 2018
end time: 5:01 PM CDT
end location: 15 miles NE Keystone, NE

Survey_summary: brief touchdown in an open field confirmed by
a photograph.

.Tornado #4 McPherson County tornado...

Rating: EF-1
estimated peak wind: 100 mph
path length /statute/: 21.4 miles
path width /maximum/: 195 yards
fatalities: 0
injuries: 0

Start date: June 17, 2018
start time: 5:13 PM CDT
start location: 15 miles SW Tryon, NE

End date: June 17, 2018
end time: 5:17 PM CDT
end location: 17 miles SW Tryon, NE

Survey_summary: a rental house, and tree line was damaged by the
tornado, and it also sent a piece of wood through a Deer stand. The
tornado continued on to the northeast and hit another Homestead where
the windows were shattered, a door was blown in and door jamb
damaged while the residents attempted to hold the door shut. There
was also full flipped pivot.

Ef scale: the Enhanced Fujita scale classifies
tornadoes into the following categories.

EF0... weak... ... 65 to 85 mph
EF1... weak... ... 86 to 110 mph
EF2... strong... .111 to 135 mph
EF3... strong... .136 to 165 mph
EF4... violent... 166 to 200 mph
EF5... violent... >200 mph



Note:
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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