____________________
moist
____________________
typically
from
the
Gulf
of
Mexico
,
____________________
air
typically
from
Canada
and
____________________
air
typically
from
the
Rockies
,
when
these
air
masses
____________________
they
create
the
perfect
conditions
for
a
tornado
.
Nearly
three
-
quarters
of
the
world's
tornadoes
occur
in
the
United
States
and
the
____________________
season
is
between
May
and
June
.
A
majority
touch
down
in
Tornado
____________________
,
a
section
of
the
central
United
States
but
tornadoes
have
been
____________________
in
all
50
states
and
on
every
____________________
except
Antarctica
.
Tornadoes
are
very
____________________
and
you
should
never
underestimate
their
____________________
.
The
____________________
time
between
a
tornado
warning
and
a
strike
is
____________________
at
a
mere
13
minutes
,
giving
residents
little
time
to
seek
____________________
.
On
average
tornadoes
killed
____________________
people
every
year
in
the
United
States
!
The
____________________
tornado
in
history
was
not
in
the
United
States
but
a
tornado
that
ripped
through
Bangladesh
in
____________________
,
killing
an
estimated
1
,
300
people
.
We
measure
the
amount
of
____________________
to
land
and
property
using
the
EF
____________________
,
which
ranks
tornadoes
on
six
different
____________________
.
From
zero
a
heavy
breeze
that
can
____________________
crops
to
level
five
,
enough
wind
to
____________________
up
a
house
.
It's
the
desire
to
better
understand
them
that
sends
____________________
into
the
field
year
after
year
in
search
of
answers
that
can
hopefully
save
____________________
while
putting
theirs
at
risk
.