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-------- Original Message --------
711
NOUS41 KWBC 091554
PNSWSH
Public Information Statement, Comment Request
National Weather Service Headquarters, Washington, DC
1053 AM EST Wed Nov 9 2011
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners, Users and Employees
From: Geoff DiMego
Chief, Mesoscale Modeling Branch
NCEP/Environmental Modeling Center
Subject: Soliciting Public Comments through December 12, 2011,
on the removal of some obsolete RUC model output
The National Centers for Environmental Prediction (NCEP) will be
replacing the Rapid Update Cycle (RUC) model with the Rapid
Refresh (RAP) in early 2012. Please see NWS TIN 11-36
announcing the intent to make this change. Based on NCEPs
current knowledge of RUC user requirements, NCEP is trying to
continue providing all pertinent output products from the RAP
now produced from the RUC. In the interest of making the best
use of resources across the enterprise, NWS is proposing to
remove several obsolete RUC products when the transition to the
RAP occurs. Details are given below about the products slated
for removal. NWS is seeking comments on this proposed change
through December 12, 2011.
The RUC and subsequent RAP models have a native resolution of
13km. RUC output is produced on 13, 20, and 40 km output grids
that cover the domain slightly larger than the CONUS. The RAP
covers a much larger domain; a new 32 km full-domain and 11 km
Alaska regional grids will be generated in addition to all of
the current grids generated in the RUC with the exceptions
listed in the next section.
The products NCEP is proposing to remove are the following:
A. 80 km output grids: 80 km grids represent an inferior grid
resolution; output is only available for a small fraction of the
cycles and forecast hours for which the RUC and RAP are run.
These products are available on NOAAPORT under the WMO headers
Y*Q*** KWBG and Z*Q*** KWBG, where the * digits of the header
varies depending on the element and time for which the grid is
valid. The 80 km grids are available in aggregated files at the
following locations:
NWS FTP server:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.ruc_CY.hh/RD.
YYYYMMDD/PT.grid_DF.gr2/fh.xxxx_tl.press_gr.us80km
where hh is the model cycle, YYYYMMDD is the date, and xxxx is
the forecast projection.
NCEP server:
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/ruc/prod/ruc2a.
YYYYMMDD/ruc2.tccz.grb2fxx.grib2
where YYYYMMDD is the date, cc the model cycle, and xx the
forecast projection.
B. Surface "sgrb" files: These surface files were originally
created to contain a small subset of RUC output fields. All of
the fields in the sgrb files are available in the 13, 20, and 40
km pgrb files for users to obtain, duplicating output. The sgrb
files are currently available in aggregated files at the
following locations:
NWS FTP server:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.ruc_CY.hh/RD.
YYYYMMDD/PT.grid_DF.gr2/
where hh is the model cycle and YYYYMMDD is the date. The
filenames are fh.xxxx_tl.press_gr.sgrib for the 40 km grid and
fh.xxxx_tl.press_gr.sgrib20 for the 20 km grid, where xxxx is
the forecast projection.
NCEP server:
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/ruc/prod/ruc2a.YYYYMMDD
where YYYYMMDD is the date. The filenames are
ruc2.tccz.sgrbfxx.grib2 for the 40 km grid and
ruc2.tccz.sgrb20fxx.grib2 for the 20 km grid, where cc is the
model cycle, and xx the forecast projection.
The sgrb files are also available on NCEPs NOMADS system through
the grib filter application at:
http://nomads.ncep.noaa.gov/cgi-bin/filter_ruc.pl
C. 40 km "bgrb" output grids containing output on the native
levels: Most users use model output on pressure levels; the
RUC/RAP output on native levels will continue to be available at
finer resolutions than 40 km. The 40 km "bgrb" files are
available in aggregated files at the following locations:
NWS FTP server:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.ruc_CY.hh/RD.YYY
YMMDD/PT.grid_DF.gr2/fh.xxxx_tl.press_gr.bgrib
where hh is the model cycle, YYYYMMDD is the date, and xxxx is
the forecast projection.
NCEP server:
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/ruc/prod/ruc2a.
YYYYMMDD/ruc2.tccz.bgrbfxx.grib2
where YYYYMMDD is the date, cc the model cycle, and xx the
forecast projection.
NWS will evaluate all comments to determine whether to proceed
with this change as part of the RUC to RAP transition. NCEP will
issue another TIN if the decision is made to terminate any or
all of these products.
Send comments on this proposal to:
Geoff Manikin
NWS/NCEP Environmental Modeling Center
Camp Springs, MD
geoffrey.manikin@xxxxxxxx
or
Rebecca Cosgrove
NWS/NCEP Central Operations
Camp Spring, MD
rebecca.cosgrove@xxxxxxxx
National Public Information Statements are online at:
http://www.weather.gov/os/notif.htm
$$
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