Violent
winds
,
____________________
rain
,
killer
waves
:
these
are
the
hallmarks
of
a
hurricane
.
Also
called
____________________
or
____________________
,
hurricanes
are
giant
storms
prowling
the
world's
tropical
seas
.
An
average
hurricane
releases
as
much
energy
in
a
day
as
the
explosion
of
half
a
million
small
atomic
____________________
.
Hurricanes
form
in
the
summer
and
____________________
when
the
sun
____________________
vast
____________________
of
tropical
ocean
to
over
____________________
degrees
.
Warm
____________________
air
____________________
over
theses
____________________
creating
thunderstorms
.
Upper
level
winds
and
surface
winds
then
come
together
,
forming
a
circular
____________________
of
clouds
known
as
a
tropical
depression
.
When
the
winds
____________________
39
miles
per
hour
a
tropical
storm
has
developed
.
When
the
winds
reach
____________________
miles
per
hour
a
hurricane
is
officially
born
.
____________________
the
storm
,
bands
of
rain
up
to
____________________
miles
long
meet
in
the
eye
-
wall
,
the
most
violent
____________________
.
Here
winds
of
up
to
____________________
miles
per
hour
spiral
____________________
.
Within
the
centre
of
the
hurricane
,
____________________
of
____________________
air
create
a
strangely
calm
area
called
?
the
eye
?
.
Fully
formed
,
a
hurricane
may
stretch
over
____________________
miles
in
____________________
-
that's
a
storm
nearly
the
size
of
Texas
and
reach
a
____________________
of
9
miles
.
Most
of
these
storms
spin
out
over
the
open
sea
,
but
in
an
average
year
two
or
three
will
____________________
the
mainland
of
North
America
and
when
they
do
,
the
____________________
can
be
catastrophic
.
Most
dangerous
is
the
storm
____________________
,
a
wall
of
water
that
sweeps
across
the
____________________
where
the
hurricane
makes
____________________
.
About
____________________
people
were
killed
by
hurricanes
if
the
20th
century
including
some
____________________
in
the
United
states
.
Hurricanes
are
also
costly
in
dollars
.
1992's
hurricane
Andrew
was
the
most
____________________
natural
disaster
in
US
history
causing
more
than
$25
billion
worth
of
damage
.
Scientists
are
searching
for
better
ways
to
predict
the
____________________
of
a
hurricane
.
Special
planes
called
hurricane
hunters
fly
directly
into
these
monster
storms
and
drop
____________________
to
measure
wind
speed
,
temperature
and
air
pressure
,
providing
vital
____________________
to
the
hurricane's
____________________
.
New
3D
models
are
also
helping
scientists
understand
this
____________________
force
of
nature
and
provide
quicker
and
more
accurate
____________________
to
anyone
unlucky
enough
to
be
caught
in
its
path
.
