<s>
The	O
Hurricane	B-Application
Weather	B-Application
Research	I-Application
and	I-Application
Forecasting	I-Application
(	O
HWRF	B-Application
)	O
model	B-Application
is	O
a	O
specialized	O
version	O
of	O
the	O
weather	B-Application
research	I-Application
and	I-Application
forecasting	I-Application
model	I-Application
and	O
is	O
used	O
to	O
forecast	O
the	O
track	O
and	O
intensity	O
of	O
tropical	O
cyclones	O
.	O
</s>
<s>
The	O
model	B-Application
was	O
developed	O
by	O
the	O
National	O
Oceanic	O
and	O
Atmospheric	O
Administration	O
(	O
NOAA	O
)	O
,	O
the	O
U.S.	O
</s>
<s>
The	O
HWRF	B-Application
computer	O
model	B-Application
is	O
the	O
operational	O
backbone	O
for	O
hurricane	B-Application
track	I-Application
and	O
intensity	O
forecasts	O
by	O
the	O
National	O
Hurricane	B-Application
Center	O
(	O
NHC	O
)	O
.	O
</s>
<s>
The	O
model	B-Application
will	O
use	O
data	O
from	O
satellite	O
observations	O
,	O
buoys	O
,	O
and	O
reconnaissance	O
aircraft	O
,	O
making	O
it	O
able	O
to	O
access	O
more	O
meteorological	O
data	O
than	O
any	O
other	O
hurricane	B-Application
model	B-Application
before	O
it	O
.	O
</s>
<s>
The	O
model	B-Application
will	O
eventually	O
run	O
at	O
an	O
even	O
higher	O
resolution	B-Algorithm
which	O
will	O
allow	O
smaller	O
scale	O
features	O
to	O
become	O
more	O
discernible	O
.	O
</s>
<s>
The	O
following	O
model	B-Application
description	O
can	O
be	O
found	O
in	O
the	O
product	O
description	O
document	O
for	O
the	O
National	O
Centers	O
for	O
Environmental	O
Prediction	O
's	O
Model	B-Application
Analyses	O
&	O
Forecasts	O
:	O
—	O
The	O
HWRF	B-Application
provides	O
operational	O
guidance	O
for	O
forecasters	O
at	O
the	O
National	O
Hurricane	B-Application
Center	O
in	O
both	O
the	O
North	O
Atlantic	O
and	O
East	O
Pacific	O
basins	O
.	O
</s>
<s>
Hurricane	B-Application
forecasts	I-Application
are	O
produced	O
on	O
demand	O
every	O
six	O
hours	O
at	O
00	O
,	O
06	O
,	O
12	O
,	O
and	O
18	O
UTC	O
for	O
up	O
to	O
four	O
tropical	O
storms	O
at	O
a	O
time	O
.	O
</s>
<s>
The	O
HWRF	B-Application
hurricane	B-Application
model	B-Application
graphics	O
are	O
available	O
at	O
six-hour	O
increments	O
up	O
to	O
126	O
hours	O
.	O
</s>
<s>
—	O
The	O
model	B-Application
is	O
a	O
nested	O
grid	O
system	O
with	O
an	O
outermost	O
domain	O
and	O
a	O
nested	O
grid	O
with	O
resolutions	O
of	O
27	O
and	O
9	O
km	O
respectively	O
and	O
42	O
vertical	O
levels	O
.	O
</s>
<s>
The	O
HWRF	B-Application
vortex	O
initialization	O
uses	O
the	O
6	O
hour	O
forecast	O
as	O
the	O
first	O
guess	O
,	O
then	O
uses	O
regional	O
GSI	O
3DAR	O
data	O
assimilation	O
to	O
produce	O
the	O
initial	O
hurricane	B-Application
vortex	O
that	O
matches	O
the	O
intensity	O
and	O
structure	O
parameters	O
provided	O
operationally	O
by	O
NHC	O
.	O
</s>
<s>
The	O
HWRF	B-Application
is	O
coupled	O
to	O
a	O
high-resolution	B-Algorithm
version	O
of	O
the	O
Princeton	O
Ocean	O
Model	B-Application
for	O
the	O
Atlantic	O
Basin	O
.	O
</s>
<s>
Mary	O
Glackin	O
,	O
acting	O
director	O
of	O
NOAA	O
's	O
National	O
Weather	O
Service	O
,	O
says	O
that	O
"	O
It	O
is	O
vital	O
that	O
we	O
understand	O
all	O
the	O
factors	O
of	O
hurricane	B-Application
forecasting	I-Application
throughout	O
the	O
life	O
of	O
a	O
storm	O
and	O
HWRF	B-Application
will	O
provide	O
an	O
unprecedented	O
level	O
of	O
detail	O
.	O
</s>
<s>
Over	O
the	O
next	O
several	O
years	O
,	O
this	O
model	B-Application
promises	O
to	O
improve	O
forecasts	O
for	O
tropical	O
cyclone	O
intensity	O
,	O
wave	O
and	O
storm	O
surge	O
,	O
and	O
hurricane-related	O
inland	O
flooding.	O
"	O
</s>
<s>
She	O
also	O
says	O
that	O
the	O
HWRF	B-Application
"	O
will	O
be	O
one	O
of	O
the	O
most	O
dynamic	O
tools	O
available	O
"	O
for	O
forecasters	O
.	O
</s>
<s>
Development	O
of	O
the	O
HWRF	B-Application
model	B-Application
began	O
in	O
2002	O
.	O
</s>
<s>
In	O
2007	O
,	O
the	O
HWRF	B-Application
model	B-Application
became	O
operational	O
.	O
</s>
<s>
While	O
the	O
HWRF	B-Application
model	B-Application
will	O
eventually	O
replace	O
the	O
GFDL	O
model	B-Application
,	O
the	O
GFDL	O
model	B-Application
will	O
continue	O
to	O
be	O
run	O
in	O
2007	O
.	O
</s>
<s>
The	O
GFDL	O
model	B-Application
has	O
continued	O
to	O
be	O
run	O
operationally	O
through	O
2012	O
.	O
</s>
