<s>
The	O
Flow-following	B-Application
,	I-Application
finite-volume	I-Application
Icosahedral	I-Application
Model	I-Application
(	O
FIM	O
)	O
is	O
an	O
experimental	O
numerical	B-General_Concept
weather	I-General_Concept
prediction	I-General_Concept
model	O
that	O
was	O
developed	O
at	O
the	O
Earth	O
System	O
Research	O
Laboratory	O
in	O
the	O
United	O
States	O
from	O
2008	O
to	O
2016	O
.	O
</s>
<s>
Its	O
three-part	O
name	O
derives	O
from	O
its	O
key	O
features	O
:	O
"	O
flow-following	O
"	O
indicates	O
that	O
its	O
vertical	O
coordinates	O
are	O
based	O
on	O
both	O
terrain	O
and	O
potential	O
temperature	O
(	O
isentropic	O
sigma	O
coordinates	O
,	O
previously	O
used	O
in	O
the	O
now-discontinued	O
rapid	B-Architecture
update	I-Architecture
cycle	I-Architecture
model	O
)	O
,	O
and	O
"	B-Algorithm
finite-volume	I-Algorithm
"	I-Algorithm
describes	I-Algorithm
the	I-Algorithm
method	I-Algorithm
used	O
for	O
calculating	O
horizontal	O
transport	O
.	O
</s>
<s>
The	O
FIM7	O
also	O
runs	O
four	O
runs	O
between	O
Tuesday	O
and	O
Wednesday	O
each	O
week	O
as	O
a	O
climate	B-Application
model	I-Application
,	O
with	O
the	O
mean	O
output	O
from	O
those	O
runs	O
issued	O
in	O
one-week	O
intervals	O
;	O
it	O
thus	O
complements	O
the	O
Climate	B-Application
Forecast	I-Application
System	I-Application
,	O
the	O
only	O
other	O
model	O
in	O
the	O
U.S.	O
government	O
's	O
arsenal	O
that	O
covers	O
that	O
time	O
frame	O
.	O
</s>
