<s>
The	O
Global	B-Application
Environmental	I-Application
Multiscale	I-Application
Model	I-Application
(	O
GEM	O
)	O
,	O
often	O
known	O
as	O
the	O
CMC	O
model	O
in	O
North	O
America	O
,	O
is	O
an	O
integrated	O
forecasting	O
and	O
data	O
assimilation	O
system	O
developed	O
in	O
the	O
Recherche	O
en	O
Prévision	O
Numérique	O
(	O
RPN	O
)	O
,	O
Meteorological	O
Research	O
Branch	O
(	O
MRB	O
)	O
,	O
and	O
the	O
Canadian	O
Meteorological	O
Centre	O
(	O
CMC	O
)	O
.	O
</s>
<s>
Along	O
with	O
the	O
NWS	O
's	O
Global	O
Forecast	O
System	O
(	O
GFS	O
)	O
,	O
which	O
runs	O
out	O
to	O
16	O
days	O
,	O
the	O
ECMWF	O
's	O
Integrated	B-Application
Forecast	I-Application
System	I-Application
(	O
IFS	O
)	O
,	O
which	O
runs	O
out	O
10	O
days	O
,	O
the	O
Naval	O
Research	O
Laboratory	O
Navy	B-Application
Global	I-Application
Environmental	I-Application
Model	I-Application
(	O
NAVGEM	B-Application
)	O
,	O
which	O
runs	O
out	O
eight	O
days	O
,	O
and	O
the	O
UK	O
Met	O
Office	O
's	O
Unified	B-Application
Model	I-Application
,	O
which	O
runs	O
out	O
to	O
six	O
days	O
,	O
it	O
is	O
one	O
of	O
the	O
five	O
predominant	O
synoptic	O
scale	O
medium-range	O
models	O
in	O
general	O
use	O
.	O
</s>
<s>
Output	O
from	O
the	O
GEM	O
goes	O
out	O
to	O
10	O
days	O
,	O
on	O
par	O
with	O
the	O
public	O
output	O
of	O
the	O
European	O
Integrated	B-Application
Forecast	I-Application
System	I-Application
.	O
</s>
<s>
The	O
time	O
discretization	B-Algorithm
is	O
an	O
implicit	O
two-time-level	O
semi-Lagrangian	B-Application
scheme	I-Application
.	O
</s>
<s>
The	O
spatial	O
discretization	B-Algorithm
is	O
a	O
Galerkin	O
grid-point	O
formulation	O
on	O
an	O
Arakawa	O
C-grid	O
in	O
the	O
horizontal	O
(	O
lat-lon	O
)	O
and	O
an	O
unstaggered	O
vertical	O
discretization	B-Algorithm
.	O
</s>
<s>
The	O
distributed	O
memory	O
version	O
of	O
GEM	O
is	O
almost	O
completed	O
,	O
it	O
is	O
a	O
major	O
recoding	O
effort	O
that	O
is	O
based	O
upon	O
a	O
locally	O
developed	O
communication	O
interface	O
currently	O
using	O
Message	B-Application
Passing	I-Application
Interface	I-Application
.	O
</s>
<s>
Output	O
from	O
Canadian	O
forecast	O
models	O
such	O
as	O
the	O
GEM	O
is	O
under	O
Canadian	O
crown	O
copyright	O
but	O
is	O
issued	O
under	O
a	O
free	B-License
license	I-License
if	I-License
properly	I-License
attributed	I-License
to	O
Environment	O
Canada	O
.	O
</s>
