Public Information Statement
Issued by NWS New Orleans/Baton Rouge, LA

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Public Information Statement
National Weather Service New Orleans LA
904 AM CST Fri Feb 10 2017

...Multiple Tornadoes Confirmed on 02/07/2017...

.Overview...On Tuesday February 7, several supercell
thunderstorms affected Southeast Louisiana and a total of 6
tornadoes have now been confirmed. This information is considered
preliminary and may be subject to additional updates and
corrections.

Update #1 - Added survey summary for the New Orleans East tornado
and corrected street names in the summary for the Killian to
Madisonville tornado. Also corrected times to read CST instead of
CDT.

Update #2 - Added more details to Donaldsonville tornado and
corrected begin time for Metairie tornado.

&&

...Tornado #1 - From Near Killian to Southwest of Madisonville
through Livingston...Tangipahoa...and St Tammany Parishes...

Rating:                 EF-2
Estimated Peak Wind:    125 MPH
Path Length /Statute/:  23.2 miles
Path Width /Maximum/:   500 yards
*Fatalities:            0
*Injuries:              3

Start Date:             Feb 7 2017
Start Time:             1020 AM CST
Start Lat/Lon:          30.313N / -90.587W
End Lat/Lon:            30.397N / -90.211W

...Survey Summary...
The tornado touched down just off Carthage Bluff Rd where some
siding was removed from a single family home and small branches
were taken off of trees. The width of the tornado in the area
was approximately 75 yards wide, and wind speeds  were estimated
to be around 80 mph.  The tornado then proceeded just north of
Carthage Bluff Rd. in a ENE direction, and widened to approximately
150 yards wide. Numerous hardwood trees were snapped and uprooted
falling on a home, shed, and several vehicles. Wind speeds were
estimated to be around 100 mph in this area. The tornado then
widened considerably as it approached a bend in Carthage Bluff Rd
around the intersection with Carthage Lane. A single wide mobile
home lost a significant portion of the roof on Carthage Bluff
Lane, numerous soft and hardwood trees were snapped or uprooted,
and a single family home had the chimney collapse and some
roofing material removed. The tornado had widened to approximately
350 yards wide at this point. Damage was consistent with a 100 mph
EF-1 tornado in this area. The tornado then crossed a large field
where several trees were snapped and uprooted. The tornado
maintained the same width and intensity as it crossed the field.

As the tornado approached a farmstead on Davidson Road, it
maintained width, but increased in intensity to an EF-2 tornado
with winds of around 115 mph as it destroyed three barns. A
single family home stick built single family home was lifted off
of an unsecured cinder block foundation and completely destroyed
on Davidson Rd. Two people were seriously injured at this spot.
Due to the house not being secured to the foundation, the winds
were estimated to be around 120 mph in this location. A snapped
telephone pole also supports this wind speed in this area. The
tornado then crossed Davidson Rd. producing minor to moderate
damage to a manufactured home and a single family home on a
private lane. Numerous trees were also snapped and uprooted. The
tornado remained at 350 yards wide in this area, and maintained
EF-2 intensity with winds of around 120 mph. At this point, the
tornado moved into a marshy wildlife refuge area with no road
access. However, video of the large wedge tornado was taken as it
moved across this marshland and then across Interstate 55 around
mile marker 19. Due to the lack of access, an intensity rating
cannot be given to the tornado as it moved through the marsh
land, but an intensity of EF-1 with winds of 105 mph was given to
the tornado as it moved across Interstate 55 and numerous trees
were snapped and uprooted in this area. The tornado width had also
increased to 500 yards at this point.

The tornado then continued in a ENE direction across more open
marsh land until it reached the Guste Island area of St. Tammany
Parish and the Madisonville on the Lake Subdivision. The tornado
had contracted back to a width of 350 yards in this area and
maintained this width as it moved across both Chenier Rd. and
Grand Port Louis Rd. The tornado produced EF-2 damage on Chenier
Rd. where a house that was secured to concrete and rebar piers
was moved off the foundation. Extensive roof damage was also noted
to the house. Winds were estimated to be around 125 mph in this
location. The tornado produced extensive tree damage on Grand
Port Louis Rd. before dissipating just west of the city of
Madisonville over open marsh.

&&

...Tornado #2 - Near Metairie in Jefferson Parish Louisiana...

Rating:                 EF-0
Estimated Peak Wind:    80 MPH
Path Length /Statute/:  0.95 miles
Path Width /Maximum/:   25 yards
*Fatalities:            0
*Injuries:              0

Start Date:             Feb 7 2017
Start Time:             1051 AM CST
Start Lat/Lon:          29.961N / -90.178W
End Lat/Lon:            29.965N / -90.163W

...Survey Summary...
Tornado began near Elmwood and led to intermittent large tree
limb and minor roof damage along a one mile path into the Old
Jefferson area of Metairie.

&&

...Tornado #3 - East New Orleans in Orleans Parish Louisiana...

Rating:                 EF-3
Estimated Peak Wind:    150 MPH
Path Length /Statute/:  10.1 miles
Path Width /Maximum/:   600 yards
*Fatalities:            0
*Injuries:              33, 5 to 6 serious

Start Date:             Feb 7 2017
Start Time:             1112 AM CST
Start Lat/Lon:          30.011N / -90.000N
End Time:               1132 AM CST
End Lat/Lon:            30.030W / -89.835N

...Survey Summary... The tornado touched down along Old Gentilly
Rd about 1.5 miles east of the Industrial Canal. It moved
northeast, quickly strengthening into an EF-2 tornado by the time
it reached Chef Hwy. Here it snapped several wooden power poles
and caused significant roof damage to an apartment complex and
another building similar to an automobile service building. As it
moved farther northeast, the damage clearly indicates it became
multi- vortex with a second strong vortex taking over as the
primary circulation to the north of the first.

This second vortex began moving northeast near the intersection
of Flake Street and Grant Avenue. On Arthur Drive and Charlene
Drive, two homes were severely damaged with most exterior walls
and one or two interior walls collapsed. Winds are estimated to
have been around 140 mph in this area. At this point the tornado
turned more to the east producing a fairly wide swath of solid
EF-2 damage with numerous homes losing significant portions or all
of their roofing structure.

The worst damage was in the area along and just north of Grant
Ave from Charlmark Drive to Read Blvd. In this area, nearly every
home suffered complete loss of the roof structure and several
homes suffered collapsed exterior walls. There were 3 two-story
homes on which the entire second floor was destroyed with only a
few interior walls remaining. These homes are the basis for the
150 mph maximum wind rating. This area was by far the largest
swath of EF- 3 damage with an approximate width of 125 yards and
length of 550 yards.

The tornado continued to cause mostly EF-2 damage with a few
small patches of lower end EF-3 damage as it move eastward toward
Bullard Ave. The small pockets of EF-3 damage were noted near the
intersection of Good Drive and Chef Menteur Boulevard where a
church lost all but one exterior wall and most interior walls, and
immediately along Chef Menteur Boulevard from Wright Road to
Major Dr where three steel electrical transmission poles were
bent. As the tornado approached Bullard Avenue, a third vortex
took over as the primary circulation resulting in an apparent turn
to the southeast.

This third vortex appears to have remained the primary
circulation for the remainder of the tornado`s existence over
land. It began to move nearly due eastward as it approached the
intersection of Almonaster Avenue and Paris Road, producing
primarily EF-0 and EF- 1 damage. One small pocket of EF-2 damage
was noted in the vicinity of the NASA Michoud Assembly Center
where a metal building suffered buckling of the roof supports and
one of the NASA buildings suffered significant roof damage and
collapse of both the brick facade and cinder block walls in a few
places. The tornado continued eastward until it reached Lake
Borgne, at which point the track is terminated. However, the
tornado likely continued to be in contact with the water for some
time based on radar signatures of very tight rotation, a well
defined hook echo, and even a continued debris signature as it
carried debris from over land into marine areas.

In total, the tornado caused moderate to severe damage to
638 homes, of which around half will likely be considered total
losses. At least 40 businesses also suffered moderate to severe
damage.

&&

...Tornado #4 - From Near Donaldsonville to the Sunshine Bridge
in Ascension and St James Parishes Louisiana...

Rating:                 EF-1
Estimated Peak Wind:    105 MPH
Path Length /Statute/:  6.11 miles
Path Width /Maximum/:   75 yards
*Fatalities:            0
*Injuries:              0

Start Date:             Feb 7 2017
Start Time:             1104 AM CST
Start Lat/Lon:          30.098N / -91.005W
End Lat/Lon:            30.105N / -90.903W

...Survey Summary...
The tornado track began in Donaldsonville in Ascension Parish
damaging roofs to several houses...knocking down power lines
and trees and shifting a small house off its pier foundation.
Damage was primarily EF 1 through this area. The tornado continue
to track east near River Rd damaging a few structures...downing
several trees and power lines. Approximately 18 homes were damaged
in the Donaldsonville area of Ascension Parish.

The tornado continued into St James Parish and impacting small
communities on the west and east bank of the Mississippi near
the LA highway 70 bridge over the Mississippi River. Damage was
primarily to house roofs being damaged...windows blown out...downed
trees and power lines mph. In St James parish 4 homes were
classified as heavily damaged or destroyed and 14 with minor to
moderate damage.

&&

...Tornado #5 - Near Watson in Livingston Parish Louisiana...

Rating:                 EF-3
Estimated Peak Wind:    140 MPH
Path Length /Statute/:  6.43 miles
Path Width /Maximum/:   350 yards
*Fatalities:            0
*Injuries:              3

Start Date:             Feb 7 2017
Start Time:             1150 AM CST
Start Lat/Lon:          30.621N / -90.904W
End Lat/Lon:            30.625N / -90.798W

...Survey Summary...
The tornado first touched down on Little Woods Dr. and proceeded
due east just north of Percy Easterly Road. The tornado was
initially a narrow 25 yards wide, but quickly widened to over
100 yards wide as it moved east through a stand of trees.
Intensity in this area was EF-1 level with estimated winds of
around 100 mph. The tornado then continued to the east and rapidly
intensified as it approached some high tension electrical lines
running in a north-south direction between Little Woods Dr. and
Nan Westerly Rd. The tornado was estimated to be approximately 200
yards wide at this point, and winds were estimated at 140 mph or
EF-3 strength due to the metal truss system supporting the
electrical lines being twisted and collapsed. As the tornado
approached Nan Westerly Rd. it widened considerably to around 350
yards, and also decreased slightly in intensity to a high end EF-2
tornado. Three manufactured homes were completely destroyed with
only the metal undergirding remaining. All walls and floors were
removed. Two single family homes in this area had significant roof
damage with support beams removed. Numerous hardwood trees were
also snapped in this area. Winds were estimated to be around 125
mph at this point. The tornado continued eastward across a fairly
open field until it impacted several homes and an industrial
building on Highway 1023 or Renninger Road. The tornado maintained
the same width as it crossed the road at around 350 yards, and
produced more EF-2 damage with winds remaining around 125 mph. A
manufactured home was completely destroyed, and the industrial
building had most of the exterior wall on one side of the building
removed. Numerous hardwood trees including a large live oak also
had trunks snapped in this area.

The tornado continued to the east, and decreased in intensity to
EF-1 with winds of approximately 100 mph as it crossed Highway
447, Joe Lee Road, Highway 63, and Highway 449. Several
manufactured homes experienced minor damage on Highway 447 and
Joe Lee Road with the worst damage noted on Joe Lee Road where a
home had partial uplift of tin roofing material. Numerous softwood
trees were also snapped along the path of the tornado. Damage was
noted after it crossed into the woods east of Highway 449, but
the lack of access prohibited further assessment. Tornadic
activity was not observed further to the east on Highway 1036 or
Highway 441.

&&

...Tornado # 6 - North of Holden in Livingston Parish Louisiana...

Rating:                 EF-1
Estimated Peak Wind:    100 MPH
Path Length /Statute/:  0.25 miles
Path Width /Maximum/:   50 yards
*Fatalities:            0
*Injuries:              0

Start Date:             Feb 7 2017
Start Time:             1220 PM CST
Start Lat/Lon:          30.633N / -90.616W
End Lat/Lon:            30.633N / -90.616W

...Storm Summary...
A brief tornado touch down was noted near the intersection of
Highway 442 and Greer Lane in far northern Livingston Parish. A
telephone pole was leaning, and several  softwood trees were
snapped along Greer Lane.  The path width was approximately 50
yards wide, and the intensity was rated EF-1 with winds of
100 mph. The tornado passed over Highway 442, and then proceeded
east just south of a manufactured home. More trees were snapped
in this area and the tornado maintained EF-1 intensity. However,
as the tornado moved further to the east, the intensity weakened
to an EF-0 with winds of around 75 mph before dissipating just
before entering a wooded area. Large branches were removed from
trees in this area, and a carport lost some tin roof covering.

&&

* 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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