[nws-changes] 20121022: RAP Native files Fwd: ADMIN NOTICE NOUS41 KWBC

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465
NOUS41 KWBC 221542
PNSWSH

Technical Implementation Notice 12-51
National Weather Service Headquarters Washington DC
1142 AM EDT Mon Oct 22 2012
To: 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: Change to Parameters and Precision in RAP Native Files: 
           Effective November 27, 2012
Effective on or about Tuesday, November 27, 2012, beginning with the 
1200 Coordinated Universal Time (UTC) run, the National Centers for
Environmental Prediction (NCEP) will make changes to the 13 and 20 km
native bgrb files from the Rapid Refresh (RAP) model.  The content
will change for the files for forecast hours 04, 07, 10, 13, and 16,
while the precision of the pressure on native levels records will
change for all files.  There changes affect only the bgrb output;
there are no changes to any of the other RAP output files. These
files are available in the following locations:

NWS FTP server:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.rap_CY.hh 

where hh is the model cycle from 00 to 23
NCEP server: http://www.ftp.ncep.noaa.gov/data/nccf/com/rap/prod ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/rap/prod The RAP bgrb files contain data on native model levels along with a 
few additional parameters. These files should contain 1-hr stratiform
and convective precipitation data at forecast hours 1, 4, 7, 10, 13,
and 16.  They do contain 2-hr stratiform and convective precipitation
data at forecast hours 2, 5, 8, 11, 14, and 17, and they do contain
3-hr stratiform and convective precipitation data at forecast hours
3, 6, 9, 12, 15, and 18. The 1-hr precipitation data is currently
missing for forecast hours 4, 7, 10, 13, and 16 and will be added to
those files with this change.

These files contain data for pressure values on native model levels,
and the precision will be changed for all 50 records. The current
decimal scale factor is -2, while the binary scale factor is 1.
These values will both become 0 with the changes to give more
precision to these records.

The changes result in the size of the 13 km grib2 files increasing
from approximately 30.5 MB each to approximately 34.5 MB. The size of
the 20 km grib2 files increases from approximately 16.0 to 18.2 MB.
NCEP urges all users to ensure their decoders can handle these
changes. Sample forecast hour f04 modified native files at both
13 and 20 km resolution can be found at:
ftp://ftp.emc.ncep.noaa.gov/mmb/mmbpll/rap/test For questions regarding these changes, please contact: Geoff Manikin 
    NCEP/EMC/Mesoscale Modeling Branch
    College Park, MD
    geoffrey.manikin@xxxxxxxx
    301-683-3695

For questions regarding the dataflow aspects of these datasets,
please contact:

    Rebecca Cosgrove
    NCEP/NCO Dataflow Team
    College Park, MD
    rebecca.cosgrove@xxxxxxxx
    301-683-3906

NWS National Technical Implementation Notices are online at:
http://www.nws.noaa.gov/os/notif.htm $$
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