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533
NOUS41 KWBC 171329
PNSWSH
Technical Implementation Notice 10-35...Amended
National Weather Service Headquarters Washington DC
930 AM EDT Tue Aug 17 2010
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners...and NWS Employees
From: Tim McClung
Chief, Science Plans Branch
Office of Science and Technology
Subject: Amended: Horizontal Resolution change for CONUS RTMA
on NDGD Postponed until September 28, 2010.
Due to system software issues requiring NCEP to reschedule the
change on its supercomputers, NCEP is postponing the effective
date of the resolution changes for the CONUS RTMA from September
14 until September 28. A clarification on the filenames on the
NCEP server is also included in this amendment.
On Tuesday, September 28, 2010 at 1200 coordinated universal time
(UTC) the National Centers for Environmental Prediction (NCEP)
will change the horizontal resolution of the Real-Time Mesoscale
Analysis (RTMA) for the contiguous United States (CONUS) on the
National Digital Guidance Database (NDGD).
The RTMA is a set of gridded surface analyses and surface analysis
uncertainty fields made available at an hourly temporal frequency.
The CONUS RTMA are now made available on both NOAAPORT and the
NDGD at a horizontal resolution of 5 kilometers (km). The CONUS
RTMA will change from a horizontal resolution of 5 TO 2.5 km on
the NDGD with the exception of the GOES Effective Cloud Amount
which will remain at a horizontal resolution of 5 km.
Only the CONUS RTMA on the NDGD will change resolution, the RTMA
available on NOAAPORT will continue to be available at a
horizontal resolution of 5 km. The 2.5 km RTMA products will be
added to NOAAPORT in the coming months. A separate Technical
Implementation Notice (TIN) will be issued announcing that change.
The grids listed in Table 1 below will change to a resolution of
2.5 km. The grids listed in Table 2 will continue to be provided
at a horizontal resolution of 5 km.
Table 1: Filenames for CONUS RTMA at 2.5 km on NDGD
Filename RTMA Parameter
ds.temp.bin Temperature
ds.utemp.bin Temperature Analysis Uncertainty
ds.td.bin Dewpoint Temperature
ds.utd.bin Dewpoint Temperature Uncertainty
ds.wspd.bin Wind Speed
ds.uwspd.bin Wind Speed Analysis Uncertainty
ds.wdir.bin Wind Direction
ds.uvdir.bin Wind Direction Analysis Uncertainty
ds.precipa.bin Accumulated Precipitation
ds.press.bin Surface Pressure Analysis
ds.upress.bin Surface Pressure Analysis Uncertainty
ds.terrainh.bin Model Terrain Height
TABLE 2: Filenames for CONUS RTMA at 5 km on NDGD
Filename RTMA Parameter
ds.sky.bin GOES Effective Cloud Amount
The RTMA data for the CONUS is available from NDGD at (use
lowercase except for SL, ST, DF, DC, GT, and AR):
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.rtma/AR.conus/
Under the main directory for the CONUS RTMA, twenty-four
subdirectories exist on the NDGD, one for each hour of the day,
RT.00, RT.01, RT.02 through RT.23.
Experimental 2.5km RTMA data for the CONUS is currently available
at:
ftp://ftp.emc.ncep.noaa.gov/mmb/mmbpll/rtma/hres/parallel
Note that this is experimental data and may not be consistently
available at all times.
The RTMA data for CONUS at 2.5 km horizontal resolution will be
made available once the processing is running in parallel at NCEP
in early August. The data will be available via http and ftp on
the NCEP server:
http://www.ftp.ncep.noaa.gov/data/nccf/com/rtma2p5/para
Or
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/rtma2p5/para/
There are three files for each hour located on this server. Files
with names such as rtma2p5.t00z.2dvaranl_ndfd.grb2 contain all of
the RTMA analysis fields and the associated errors with the
exception of precipitation. Files with names such as
rtma2p5.t00z.2dvarges_ndfd.grb2 contain the first guess fields
used by the RTMA. Files with names such as
rtma2p5.t00z.pcpn_ndfd.grb2 contain the precipitation analysis.
NCEP will continue to refine the RTMA. Users may provide feedback
on the experimental RTMA products at:
http://www.weather.gov/survey/nws-survey.php?code=RTMA
For questions regarding the RTMA please contact:
Geoff DiMego
NCEP/Environmental Modeling Center
Camp Springs, MD 20746
PHONE: 301-763-8000 x7221
EMAIL: Geoff.Dimego@xxxxxxxx
All national Technical Implementation Notices are available online
at:
http://www.weather.gov/os/notif.htm
$$
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