[meg.infolist.announce] Fwd: Update to GFS v15 parallel on nomads

[Brian Gross - NOAA Federal]

Greetings everyone. In my email to you on March 30, I described a set of
model changes made by EMC as a result of the excessive snow totals and
exacerbated cold bias observed in the real-time parallel runs of GFSv15
(FV3-based GFS) this past winter. EMC evaluated these model changes, and I
described the benefits of the new configuration in that same email.

Now, those model changes are being expressed in the data available in the
real-time parallel of GFSv15, as described below in Steven's email.

Cheers,

Brian D. Gross
Director, NOAA/NWS/NCEP/Environmental Modeling Center

5830 University Research Court, Room 2050
College Park, MD 20740

Email: Brian.Gross at noaa.gov
Phone: 301-683-3748
Cell:  609-439-9702


---------- Forwarded message ---------
From: Steven Earle - NOAA Federal <steven.earle at noaa.gov>
Date: Fri, Apr 19, 2019 at 8:59 AM
Subject: Update to GFS v15 parallel on nomads
To: Andy Edman - NOAA Federal <andy.edman at noaa.gov>, Ben Kyger <
Ben.Kyger at noaa.gov>, Bill Lapenta <Bill.Lapenta at noaa.gov>, Bill Ward <
Bill.Ward at noaa.gov>, bob.maxson at noaa.gov <Bob.Maxson at noaa.gov>, Brian
Cosgrove <Brian.Cosgrove at noaa.gov>, Brian Gross - NOAA Federal <
brian.gross at noaa.gov>, Bruce Entwistle <Bruce.Entwistle at noaa.gov>, Bruce
Smith - NOAA Federal <bruce.smith at noaa.gov>, Carven Scott <
carven.scott at noaa.gov>, Christopher Strager <Christopher.Strager at noaa.gov>,
David DeWitt <david.dewitt at noaa.gov>, David Novak <david.novak at noaa.gov>,
Grant Cooper <Grant.Cooper at noaa.gov>, Gregory Patrick - NOAA Federal <
gregory.patrick at noaa.gov>, Hendrik Tolman <Hendrik.Tolman at noaa.gov>, Israel
Jirak <Israel.Jirak at noaa.gov>, Jason Tuell <Jason.Tuell at noaa.gov>, Jeffrey
Craven <Jeffrey.Craven at noaa.gov>, Jon.Gottschalck <Jon.Gottschalck at noaa.gov>,
Joseph Sienkiewicz <Joseph.Sienkiewicz at noaa.gov>, Kenneth Johnson <
Kenneth.Johnson at noaa.gov>, Mark DeMaria <Mark.DeMaria at noaa.gov>, Mark Klein
- NOAA Federal <mark.klein at noaa.gov>, Michelle Mainelli <
Michelle.M.Mainelli at noaa.gov>, Mike Bodner - NOAA Federal <
mike.bodner at noaa.gov>, Ming Ji <Ming.Ji at noaa.gov>, NCEP.List.modelevalinfo <
ncep.list.modelevalinfo at noaa.gov>, Raymond Tanabe - NOAA Federal <
raymond.tanabe at noaa.gov>, Rebecca Cosgrove <rebecca.cosgrove at noaa.gov>,
Russell Schneider <Russell.Schneider at noaa.gov>, Steven Cooper - NOAA
Federal <steven.cooper at noaa.gov>, Steven Silberberg <
Steven.Silberberg at noaa.gov>, Thomas Cuff - NOAA Federal <
thomas.cuff at noaa.gov>
Cc: Anne Myckow - NOAA Affiliate <anne.myckow at noaa.gov>, Carissa Klemmer <
carissa.l.klemmer at noaa.gov>, Wojciech Cencek - NOAA Affiliate <
wojciech.cencek at noaa.gov>


All,
NCO will be making changes to the parallel GFS v15 with today's 1200UTC
model run. The details of these changes are below.


   1.

   We changed the way snow amounts were calculated and communicated to the
   land surface model, basing it on the fraction of frozen precipitation
   falling on the ground rather than basing it on the total precipitation in
   cold conditions.
   2.

   We refined the interaction of radiation with cloud particles, allowing
   for each type of hydrometeor (convective rain, stratiform rain, snow,
   graupel, and ice) to assume its own physical characteristics as calculated
   by the GFDL microphysics scheme (like particle radius) and interact
   accordingly with the radiation scheme.
   3.

   We updated the supersaturation parameter over ice in the data
   assimilation system.
   4.

   We updated the Data Assimilation to assimilate NPP OMPS ozone, place
   NOAA-19 SBUV/2 ozone in monitor, assimilate Meteosat-11 SEVIRI channels 5 &
   6, update QC for GOES AMVs in preparation for GOES-17



The data remains available at the following locations:
  https://para.nomads.ncep.noaa.gov/pub/data/nccf/com/gfs/para/
  https://para.nomads.ncep.noaa.gov/pub/data/nccf/noaaport/gfs/
  https://para.nomads.ncep.noaa.gov/pub/data/nccf/noaaport/gdas/
  https://mageval.ncep.noaa.gov


Steven Earle
Production Analyst
NCEP Central Operations
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