June 2019 HYSPLIT upgrade at NCEP
Posted: June 7th, 2019, 12:55 pm
HYSPLIT will upgrade to NCEP's HYSPLIT version number 7.6 on or about the 12z cycle on June 12, 2019. See the Service Change Notice (SCN) for details (https://www.weather.gov/media/notificat ... pgrade.pdf).
All GFS and GDAS HSYPLIT files will then be from the upgraded NCEP GFS (with the Finite-Volume Cubed-Sphere Dynamical Core (FV3)).
The GFS-HYSPLIT half-degree forecast file (e.g. ftp://arlftp.arlhq.noaa.gov/forecast/20 ... 0z.gfs0p5f) and the GDAS half-degree archive files (e.g. ftp://arlftp.arlhq.noaa.gov/archives/gd ... 01_gdas0p5) will no longer be available. Instead there will be a quarter-degree GFS-HYSPLIT forecast and archive. Note vertical velocity will be included in the quarter-degree.
== Due to filesize, the 84-h forecast will be in three 24-h files and one 12-h file that can be concatenated. Filenames are given in the SCN referenced above.
== The archive files are daily files as for gdas0p5, but larger due to the horizontal resolution change.
The current quarter degree archive ftp://arlftp.arlhq.noaa.gov/archives/gfs0p25/ will be renamed subdirectory "gfs0p25.v1". The quarter-degree archive from the upgraded GFS model will retain the "gfs0p25" subdirectory name. There will be a period of overlap prior to the change at NCEP.
Additional changes noted in the SCN include the following:
== RAP-HYSPLIT formatted forecast files will no longer be available.
== HRRR-HYSPLIT formatted files will be created operationally by NCEP. The files have some different fields and the filenames differ (see SCN) from the HRRR currently available at ftp://arlftp.arlhq.noaa.gov/forecast/ and ftp://arlftp.arlhq.noaa.gov/archives/hrrr/.
==The change in the HRRR forecast files will begin with the NCEP change on June 12. See the SCN for filenames.
==There is no change in the pressure level HRRR files e.g. ftp://arlftp.arlhq.noaa.gov/forecast/20 ... 00z.hrrrpf
==At a date later this summer there will be a change in the archive when we start creating the archive from the new forecast files. The current archive will be terminated and renamed "hrrr.v1" and the new files will be in the "hrrr" directory. This will give a period of time in which both the old and new archives are available.
All GFS and GDAS HSYPLIT files will then be from the upgraded NCEP GFS (with the Finite-Volume Cubed-Sphere Dynamical Core (FV3)).
The GFS-HYSPLIT half-degree forecast file (e.g. ftp://arlftp.arlhq.noaa.gov/forecast/20 ... 0z.gfs0p5f) and the GDAS half-degree archive files (e.g. ftp://arlftp.arlhq.noaa.gov/archives/gd ... 01_gdas0p5) will no longer be available. Instead there will be a quarter-degree GFS-HYSPLIT forecast and archive. Note vertical velocity will be included in the quarter-degree.
== Due to filesize, the 84-h forecast will be in three 24-h files and one 12-h file that can be concatenated. Filenames are given in the SCN referenced above.
== The archive files are daily files as for gdas0p5, but larger due to the horizontal resolution change.
The current quarter degree archive ftp://arlftp.arlhq.noaa.gov/archives/gfs0p25/ will be renamed subdirectory "gfs0p25.v1". The quarter-degree archive from the upgraded GFS model will retain the "gfs0p25" subdirectory name. There will be a period of overlap prior to the change at NCEP.
Additional changes noted in the SCN include the following:
== RAP-HYSPLIT formatted forecast files will no longer be available.
== HRRR-HYSPLIT formatted files will be created operationally by NCEP. The files have some different fields and the filenames differ (see SCN) from the HRRR currently available at ftp://arlftp.arlhq.noaa.gov/forecast/ and ftp://arlftp.arlhq.noaa.gov/archives/hrrr/.
==The change in the HRRR forecast files will begin with the NCEP change on June 12. See the SCN for filenames.
==There is no change in the pressure level HRRR files e.g. ftp://arlftp.arlhq.noaa.gov/forecast/20 ... 00z.hrrrpf
==At a date later this summer there will be a change in the archive when we start creating the archive from the new forecast files. The current archive will be terminated and renamed "hrrr.v1" and the new files will be in the "hrrr" directory. This will give a period of time in which both the old and new archives are available.