040213 NCEP update(fwd)

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---------- Forwarded Message ----------


FROM:             John H. Ward
                 Chief, Production Management Branch




    On Tuesday, 17 February 2004 new equations will be implemented
in the Eta MOS guidance and the length of the MOS guidance will be
extended to 60 hours.  With these changes the issuance time for the
Eta MOS products will be delayed by 30 minutes.  The content of the
Eta MOS guidance message will not be modified with this change.  On
Tuesday, 24 February 2004 the format and content of the Eta MOS
guidance will be modified to be identical to the GFS-based MOS
guidance.  Further details can be found at:

http://www.nws.noaa.gov/om/notifications/notif03/tin03-48etamos_chgs_
eqns.txt

http://www.nws.noaa.gov/om/notifications/notif03/tin03-49etamos_chgs_
eqns.txt

    NCEP will perform a quarterly backup exercise on Thursday, 26
February during the 12 UTC model cycle (1200-1800 UTC).  If weather
conditions preclude performing this exercise it will be rescheduled
for the 12 UTC model cycle on Thursday, 4 March.  During this test no
operational products will be available from the Central Computer
System (CCS).  NGM and GFS MOS will be transmitted at the conclusion
of the test.  Backup products will be made available on the TOC FTP
server in place of the NCEP products.  Further information on the
type of products available from the backup processing and their
approximate delivery times can be found at the following web site:

    http://www.nco.ncep.noaa.gov/pmb/ncepbk/ncep_backup.html

    At 12 UTC on Tuesday, 2 March 2004, NCEP will be making changes
to the way we execute the 00 and 12 UTC RUC models.  Currently the
RUC analysis executes twice at 00 and 12 UTC.  The first run is at
the standard data cut-off period of T+25 minutes.  The second run
starts at T+70 minutes and is used to create the RUC forecasts at 00
and 12 UTC.  On the above date the early run will be discontinued.
If you are accustomed to downloading the RUC analysis at 00 and 12
UTC based off of this early analysis from the NCEP or NWS FTP
servers, you will now have to wait an additional 40 minutes for this
product to become available.  This change is being made as there is
no longer a NWS requirement to produce an early RUC analysis at 00
and 12 UTC.  This will not affect the timeliness of the 00 and 12 UTC
RUC forecasts, nor the other 22 RUC analysis and forecast runs that
are made daily.

    On 9 March additional ensemble products will become available on
the Telecommunication Operations Center's (TOC) FTP server.  Details
on file size and content for this series of changes can be found at:

http://www.nco.ncep.noaa.gov/pmb/changes/Ncep_dataflow_changes.html

   On Tuesday, 20 April 2004 the configuration of the Eta Model will
be modified to allow for the 0 - 84 hour forecast to run in the
current 0 - 60 hour time-slot.  This will be a permanent change.  The
expected new delivery times for Eta products is as follows:

    24 hr products:   5-10  minutes earlier
    36 hr products:   15-20 minutes earlier
    48 hr products:   15-20 minutes earlier
    60 hr products:   20-25 minutes earlier
    84 hr products:   35-40 minutes earlier

More precise times will be provided when they become available.
Details on the change can be found at:

http://www.nws.noaa.gov/om/notifications/tin04-07eta_compression.txt

    Currently, on both the NCEP and TOC FTP servers, over 50% of the
gridded NCEP model data sets are not being accessed.  In June 2004,
unused model data will be removed from both the TOC & NCEP FTP
servers.  During January and February file access on both FTP servers
will be reviewed.  A list of files to be removed will be posted on
the TOC and NCEP WEB sites by 1 April.  Files will only be included
on this list if they are unused on both servers.  A minimum of 60
days will be provided for user comments.  In early June all files
deemed unnecessary will be removed.  This process will provide the
server resources to host higher temporal and spatial resolution data
not currently available.  Further details will be provided as they
become available.

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