<s>
The	O
Rapid	B-Application
Refresh	I-Application
(	O
RR	O
or	O
RAP	O
)	O
is	O
a	O
numerical	B-General_Concept
weather	I-General_Concept
prediction	I-General_Concept
(	O
NWP	O
)	O
model	O
.	O
</s>
<s>
The	O
Rapid	B-Application
Refresh	I-Application
was	O
officially	O
made	O
operational	O
on	O
1	O
May	O
2012	O
,	O
replacing	O
the	O
rapid	B-Architecture
update	I-Architecture
cycle	I-Architecture
(	O
RUC	O
)	O
.	O
</s>
<s>
The	O
model	O
also	O
serves	O
as	O
the	O
boundary	O
conditions	O
for	O
the	O
higher-resolution	O
High	B-Application
Resolution	I-Application
Rapid	I-Application
Refresh	I-Application
HRRR	B-Application
model	O
,	O
that	O
uses	O
a	O
grid	O
spacing	O
on	O
a	O
domain	O
covering	O
the	O
continental	O
United	O
States	O
.	O
</s>
<s>
The	O
Rapid	B-Application
Refresh	I-Application
is	O
run	O
at	O
the	O
NOAA	O
National	O
Centers	O
for	O
Environmental	O
Prediction	O
(	O
NCEP	O
)	O
.	O
</s>
<s>
It	O
is	O
based	O
on	O
the	O
framework	O
of	O
the	O
Weather	B-Application
Research	I-Application
and	I-Application
Forecasting	I-Application
model	I-Application
(	O
WRF	O
)	O
;	O
the	O
Global	O
Forecast	O
System	O
(	O
GFS	O
)	O
provides	O
the	O
boundary	O
parameters	O
.	O
</s>
<s>
An	O
experimental	O
version	O
of	O
the	O
Rapid	B-Application
Refresh	I-Application
runs	O
at	O
the	O
Earth	O
System	O
Research	O
Laboratory	O
(	O
ESRL	O
)	O
,	O
a	O
NOAA	O
unit	O
that	O
develops	O
models	O
in	O
the	O
research	O
stage	O
prior	O
to	O
operational	O
implementation	O
at	O
NCEP	O
.	O
</s>
