<s>
The	O
North	B-Application
American	I-Application
Mesoscale	I-Application
Model	I-Application
(	O
NAM	O
)	O
is	O
a	O
numerical	B-General_Concept
weather	I-General_Concept
prediction	I-General_Concept
model	O
run	O
by	O
National	O
Centers	O
for	O
Environmental	O
Prediction	O
for	O
short-term	O
weather	O
forecasting	O
.	O
</s>
<s>
Currently	O
,	O
the	O
Weather	B-Application
Research	I-Application
and	I-Application
Forecasting	I-Application
Non-hydrostatic	I-Application
Mesoscale	I-Application
Model	I-Application
(	O
WRF-NMM	B-Application
)	O
model	O
system	O
serves	O
as	O
the	O
dynamical	O
core	O
of	O
the	O
NAM	B-Application
model	I-Application
.	O
</s>
<s>
Its	O
ensemble	B-Application
is	O
known	O
as	O
the	O
Short	O
Range	O
Ensemble	B-Application
Forecast	I-Application
(	O
SREF	O
)	O
and	O
runs	O
out	O
87	O
hours	O
.	O
</s>
