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TRANSITION TO GRIB2 ON NCEP AND NWS FTP SERVERS
Updated: 2/12/2008

The deadline for transitioning from grib1 to grib2 is January 28 2008.  The majority of grib1 data sets will no longer be populated after that date.  Equivalent grib2 data sets are now available on the NCEP and NWS ftp servers

The exceptions to the conversion are listed below with their appropriate directories and filenames.
No other GRIB1 datasets will continue to be populated.

If you would like to continue using data in GRIB1 format, NCEP Central Operations maintains the GRIB2 to GRIB1 conversion utility cnvgrib which can help through this transition. Documentation and source code is available on the Production Management Branch GRIB2 webpage.

If a grib2 data set is not available, please inform the PMB Data Flow Helpdesk at: NCEP.PMB.Dataflow@noaa.gov   
Please direct all questions concerning the software codes to the NCO PMB Dataflow Helpdesk: NCEP.PMB.Dataflow@noaa.gov

Below are tables describing GRIB1 model output files and the GRIB2 equivalents available on tgftp.ncep.noaa.gov and ftpprd.ncep.noaa.gov.

NWS FTP SERVER (tgftp.nws.noaa.gov)
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/

GRIB2 file names on the NWS ftp server will remain the same as the GRIB1 file names, but the GRIB2 files are stored in new uniquely named subdirectories.  However, the GFS 1.0 deg files are an exception; the GRIB2 version will be named fh.HHHH_tl.press_gr.1p0deg instead of fh.HHHH_tl.press_gr.onedeg.  This is to improve continuity of the names of GFS model output for all resolutions (0.5, 1.0, and 2.5 deg).

 GRIB1 FILES WHICH WILL NOT BE REMOVED FROM tgftp.nws.noaa.gov

NCEP FTP SERVER (ftp.ncep.noaa.gov or ftpprd.ncep.noaa.gov) ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/

For the GFS, NAM, NGM, RUC, and RUCS output GRIB2 files are being placed in the same directory as GRIB1. The GRIB2 files are identified with a ".grib2" extension.