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-------- Original Message -------- 906 NOUS41 KWBC 181849 PNSWSHTechnical Implementation Notice 13-27, Amended
National Weather Service Headquarters Washington DC 150 PM EST Mon Nov 18 2013To: Subscribers:
- Family of Services
- NOAA Weather Wire Service
- Emergency Managers Weather Information Network
- NOAAPORT
Other NWS Partners, Users and Employees
From: Timothy McClung
Chief, Science Plans Branch
Office of Science and Technology
Subject: Amended: Upgrade the Real-Time Ocean Forecast System
Effective December 10, 2013
Amended to change the implementation date for all changes in this
notification to December 10, 2013On or about Tuesday December 10, 2013, the National Centers for
Environmental Predictions (NCEP) Real-Time Ocean Forecast System (RTOFS) products being disseminated to the NCEP servers will be changing. The resolution of the existing grids will change, and new GRIB2 output files will be added. In addition, NCEP will disseminate the new GRIB2 RTOFS files on NOAAPORT.The changes will replace the low (10 level depths) vertical
resolution regional Network Common Data Form (NetCDF) files with high (40 level depths) vertical resolution regional NetCDF files. The data volume difference will be an increase of 64 GB per day.Low vertical resolution files will no longer be available: rtofs_glo_3dz_?FFF_6hrly_reg#.nc High vertical resolution will now be available: rtofs_glo_3dz_?FFF_6hrly_hvr_reg#.nc --Where ? is either "n" for nowcast or "f" for forecast
--FFF is the nowcast hour 006 to 048 or forecast hour from 006 to 192 --# is the region number, 1-3NetCDF RTOFS products are disseminated at the following
locations:ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/rtofs/prod/rtofs.YYYYMM
DDhttp://www.ftp.ncep.noaa.gov/data/nccf/com/rtofs/prod/rtofs.YYYYM
MDDand http://nomads.ncep.noaa.gov New surface regional GRIB2 files will be available for the
following sub-regions:Region Lat Lon Resolution
Filename =================================================================Alaska 40-84.7 140-244.7 0.3 X 0.3
rtofs_glo.t00z.fFFF_alaska_std.grb2Arctic 60-79.92 160-235.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_arctic_std.grb2Bering 40-67.12 155-210.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_bering_std.grb2Guam 0-29.92 130-179.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_guam_std.grb2Gulf of Alaska 0-62 195-236 0.5 X 0.5
rtofs_glo.t00z.fFFF_gulf_alaska_std.grb2Honolulu 0-39.92 180-229.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_honolulu_std.grb2Hudson-Baffin 45-77.5 252-333 0.25 X 0.25
rtofs_glo.t00z.fFFF_hudson_baffin_std.grb2Samoa -30- -0.08 170-214.72 0.08 X 0.08
rtofs_glo.t00z.fFFF_samoa_std..grb2Trop Pac -40-39 130-249 1 X 1
rtofs_glo.t00z.fFFF_trop_paci_lowres_std.grb2West Atlantic 10-44.72 260-305.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_west_atl_std.grb2West CONUS 10-59.92 210-259.92 0.08 X 0.08
rtofs_glo.t00z.fFFF_west_conus_std.grb2where FFF is forecast hour 024 to 144. The forecast hours start
from 01 to 72 at 1-hour intervals, and from 75 to 144 at 3-hourly intervalsThe WMO header template T1 T2 A1 A2 ii cccc will be as follows
for the products on NOAAPORT:T1 = E - oceanographic in the NWS AWIPS system T2 specifies the parameters:
H - Sea Surface Height Relative to Geoid (SSHG)
S - Salinity (SALTY)
T - Water Temperature (T)
U - U-Component of Current (UOGRD)
V - V-Component of Current (VOGRD)
U - Barotropic U Velocity (UBARO)
V - Barotropic V Velocity (VBARO)
A1 specifies the grid:
A - Alaska 0.3 km grid
B - Bering 0.08 km grid
C - Western CONUS 0.08 km grid
D - Arctic 0.08 km grid
G - Guam 0.08 km grid
I - Gulf of Alaska 0.5 km grid
K - Western Atlantic 0.08 km grid
H - Honolulu 0.08 km grid
S - Samoa 0.08 km grid
T - Tropical Pacific 1.0 km grid
J - Hudson-Baffin 0.25 degree grid
A2 specifies the forecast hours:
B = 01, 02, 03
C = 04, 05, 06
D = 07, 08, 09
E = 10, 11, 12
F = 13, 14, 15
G = 16, 17, 18
H = 19, 20, 21, 22, 23
I = 24, 25, 26, 27, 28, 29
J = 30, 31, 32, 33, 34, 35
K = 36, 37, 38, 39, 40, 41
L = 42, 43, 44, 45, 46, 47
M = 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59
N = 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71
O = 72, 75, 78, 81
P = 84, 87, 90, 93
Q = 96, 99, 102, 105, 108, 111, 114, 117
R = 120, 123, 126, 129
S = 132, 135, 138, 141
T = 144
ii = 01 - Depth Below Sea Level
cccc = KWBW, where W is Real-Time Ocean Forecast System
Follow the link below for examples of the WMO headers and the
GRIB2 data with filenames like:wmo_grib2_rtofs_glo.t00z.(n|f)FFF_region_std
(where FFF is forecast hour) and grib2_rtofs_glo.t00z.(n|f)FFF_region_std (where FFF is forecast hour)http://www.nco.ncep.noaa.gov/pmb/codes/rtofs_wmo_headers_regions/ The new products will be delivered over NOAAPORT and to the NCEP
servers. The increase in data volume for the new GRIB2 regions will be around 2.0 GB per day.The RTOFS model runs once a day in three steps occurring at 00Z,
06Z and 12Z. The daily run has 2 days of nowcast and 8 days of forecasts. For more information on the RTOFS Global model please visit:http://polar.ncep.noaa.gov/global See ON-388 Appendix A for WMO headers with NCEP GRIB information
here:http://www.nco.ncep.noaa.gov/pmb/docs/on388/appendixa.html NCEP would encourage all users to ensure their decoders are
flexible and are able to adequately handle changes in content, parameter fields changing order, changes in the scaling factor component within the Product Definition Section of the GRIB files and any volume changes which may be forthcoming. These elements may change with future NCEP model implementations. NCEP will make every attempt to alert users to these changes prior to any implementations.For questions regarding the scientific content of the modeling
system please contact:Avichal Mehra
NCEP/EMC College Park, MD Email: avichal.mehra@xxxxxxxxFor questions regarding the dataflow aspects of these data sets
please contact:NCEP/ NCO Dataflow Team
College Park, MD Phone: 301-683-0567 Email: ncep.list.pmb-dataflow@xxxxxxxxNational NWS Technical Implementation Notices are online at: http://www.nws.noaa.gov/om/notif.htm $$
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