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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Users of Unidata IDD CONDUIT feed products, This coming Wednesday, March 17, the IDD CONDUIT feed will be enhanced by the replacement of GFS v15.3 model output with GFS v16 model output. In addition to the change in GFS version data, additional vertical levels, increased grid precision, and the addition of new variables will _significantly_ increase the volume of data flowing in CONDUIT especially during the 6-hourly volume peak periods. A test feed from NCEP to Unidata showed that there can/will be up to 20GB more data available during the 6-hourly peaks, and this increased volume will have implications on product residency times in the LDM queues for sites receiving the full CONDUIT feed or the full GFS portion of the CONDUIT feed, so local LDM queue sizes may need to be increased. A breakdown of each dataset that will be impacted is shown in the following provided by NCEP for data from a GFS/GDAS 12Z cycle where PROD = v15.3 and PARA = v16: gfs.t12z.pgrb2.0p25.f* - PROD: 30 GB, PARA: 47 GB -> difference + 17GB/cycle gfs.t12z.pgrb2.0p50.f* - PROD: 13 GB, PARA 20 GB -> difference + 7GB/cycle gfs.t12z.pgrb2.1p00.f* - PROD: 3.6 GB, PARA: 5.5 GB -> difference + 2GB/cycle gdas.t12z.pgrb2.1p00.anl - PROD: 22MB, PARA: 35 MB -> difference + 13MB/cycle The changes in GFS v16 are described in Section 3 of the following NOAA Service Change Notice (SCN): Service Change Notice 21-20 https://www.weather.gov/media/notification/scn_21-20_gfsv16.0_aaa_update.pdf Section 6 of this SCN describes changes in product size and delivery stating that pgrb2 files will see a 55% increase in size with the GFS v16 upgrade. We apologize for the late notice of the impending changes, but we have been struggling to get a test feed of the reconstituted datastream for some time, and the success of the test has been sporadic, so it was difficult to fully understand the impact that will be experienced with the data volume increase. Please send questions/comments to: Unidata User Support <support@xxxxxxxxxxxxxxxx> Best regards, Unidata User Support -- ********************************************************************** < Unidata User Support UCAR Unidata Program < (303)497-8643 P.O. Box 3000 < support@xxxxxxxxxxxxxxxx Boulder, CO 80307 < ---------------------------------------------------------------------- < Unidata Web Support http://www.unidata.ucar.edu/support < ********************************************************************** <
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