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-------- Original Message --------
483
NOUS41 KWBC 301432
PNSWSH
Technical Implementation Notice 10-43
National Weather Service Headquarters Washington DC
1030 AM Mon Aug 30 2010
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPort
-Other NWS Partners and NWS Employees
From: Timothy McClung
Chief Science Plans Branch
Office of Science and Technology
Subject: Addition of GFS-Based DNG and RTMA Products for Guam:
Effective November 16, 2010
On Tuesday, November 16, 2010 at 1200 Coordinated Universal Time
(UTC), the National Centers for Environmental Prediction (NCEP)
will add Global Forecast System (GFS)-based Downscaled Numerical
Weather Prediction Grids (DNG) and the Real Time Mesoscale
Analysis (RTMA) products for Guam to NOAAPort and the National
Digital Guidance Database (NDGD). The gridded products will be
available in GRIB2 format on the same 2.5 km Mercator grid used in
the National Digital Forecast Database (NDFD) grids for Guam.
The GFS-based DNG products will be produced for the 0000, 0600,
1200 and 1800 UTC model cycles with output every 3 hours from
0 to 192 hours after model run time. The Guam DNG products are
horizontally interpolated from the 27 km GFS native grid to the
2.5 km NDFD grid. Vertical interpolation to the high resolution
terrain is performed using Smartinit. The Guam DNG products will
be available only on NOAAPort and not in the NDGD. The following
elements will be produced:
temperature at surface level
dew point at surface level
specific humidity at surface level
u - wind at surface level
v - wind at surface level
wind gust at surface level
pressure at surface level
height at surface level
land mask at surface level
total cloud cover at surface level
height at lowest level wet bulb
visibility at surface level
wind direction at planetary boundary
wind speed at planetary boundary
relative humidity at planetary boundary
geopotential height at planetary boundary
best (4 layer) lifted index at surface level
total precipitation at surface level
categorical rain at surface level
maximum temperature at surface level
minimum temperature at surface level
maximum relative humidity at surface level
maximum relative humidity at surface level
The products will be available with WMO headers L***** KWBT or
M***** KWBT. More details of the WMO headers for the Guam GFS DNG
can be found at:
http://www.nco.ncep.noaa.gov/pmb/changes/gfs_dng_guam.shtml
The RTMA for Guam is a set of gridded surface analyses and surface
analysis uncertainty fields made available every 3 hours, starting
at 0000 UTC. The RTMA products will be available on NOAAPort and
on NDGD.
The following is a list of Guam RTMA products and their associated
WMO headers:
WMO Header RTMA Parameter
LTGA98 KWBR temperature
LTGA98 KWBR temperature analysis uncertainty
LRGA98 KWBR dewpoint temperature
LRGA98 KWBR dewpoint temperature uncertainty
LNGA98 KWBR wind speed
LNGA98 KWBR wind speed analysis uncertainty
LNGA98 KWBR wind direction
LNGA98 KWBR wind direction analysis uncertainty
LUGA98 KWBR u-wind analysis (not sent to NDGD)
LVGA98 KWBR v-wind analysis (not sent to NDGD)
LPGA98 KWBR surface pressure analysis
LPGA98 KWBR surface pressure analysis uncertainty
LHGA98 KWBR model terrain height
The RTMA data for Guam will be available from NDGD at:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.rtm
a/AR.guam
DNG and RTMA data for Guam is being run in parallel at NCEP and
the data are available on the NCEP server via http and ftp at:
http://www.ftp.ncep.noaa.gov/data/nccf/com/gfs/para (Guam DNG)
http://www.ftp.ncep.noaa.gov/data/nccf/com/gurtma/para (Guam RTMA)
or
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/para (Guam DNG)
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gurtma/para (Guam RTMA)
There are two files for each hour located on this server. Files
with names such as gurtma.t00z.2dvaranl_ndfd.grb2 contain all of
the RTMA analysis fields and the associated errors. Files with
names such as gurtma.t00z.2dvarges_ndfd.grb2 contain the first
guess fields used by the RTMA.
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 GFS-based DNG please contact:
John Ward
NCEP/Environmental Modeling Center
Camp Springs, MD 20746
Phone: 301-763-8000 x 7185
Email: john.ward@xxxxxxxx
For questions regarding the RTMA please contact:
Geoff Dimego
NCEP/Environmental Modeling Center
Camp Springs, MD 20746
301-763-8000 x7221
Email: geoff.dimego@xxxxxxxx
National Technical Implementation Notices are online at:
http://www.weather.gov/os/notif.htm
$$
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