Mesoscale Parallel Experiment Change Log

FV3-CAM Issue Log

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When What Experiment Description
2019/08/29 Model Change SAR,SAR-X
  • Hord had inadvertently been set to 5 since the real-time runs were moved from the Dell to phase 2. It was switched back to 6.
  • 2019/07/30 Model Change SAR,SAR-X
  • FV3SAR forecasts have been moved from the Dell to phase 2.
  • Official start of the 12Z cycle of the FV3SAR run.
  • 2019/07/22 Model Change Nest
  • The FV3NEST parallel has been turned off.
  • 2019/06/19 Model Change SAR,SAR-X
  • Official start of the FV3SAR-X parallel. The FV3SAR-X is an experimental version of the SAR, where the FV3SAR is the control run.
  • 2019/06/02 Model Change SAR,SAR-DA
  • The FV3SAR-DA parallel was turned off.
  • 2019/05/16 Model Change Nest,SAR,
    SAR-DA
  • nstf_name is changed to 2,0,0,0,0 to match what is used in the FV3GFS.
  • Changing the second flag from 1 to 0 means the NSST data will be read in from the sfc data files instead of cold started.
  • 2019/04/22 Issue #3 Nest,SAR,
    SAR-DA
  • NCO's official FV3GFS parallel has picked up the radiation and snow changes, so these will now be incorporated into the input files for chgres.
  • 2019/04/13 Model Change Nest,SAR,
    SAR-DA
  • hybedmf is changed from false to true. This turns on the hybrid EDMF PBL scheme which was implemented in the operational GFS in 2015.
  • Previously, the 2011 version of the GFS PBL scheme was being used.
  • 2019/04/06 Graphics Change Nest,SAR
  • Difference plots comparing the 3-km FV3SAR to the 3-km NAM CONUS nest have been added.
  • The Nest & SAR plots were modified such that the difference fields are SAR - Nest instead of Nest - SAR.
  • 2019/03/27 Graphics Change Nest,SAR,
    SAR-DA
  • The regional domains were refined.
  • 6 new domains were added: Boston-NYC, Central, Colorado, Seattle-Portland, SF Bay Area, LA-Vegas
  • 2019/03/22 Graphics Change Nest,SAR,
    SAR-DA
  • Plots of max/min hourly diagnostics have been added.
  • 2019/03/15 Model Change Nest,SAR,
    SAR-DA
  • Updated versions of the high resolution tiled surface data were inserted into the regional FV3 parallels.
  • These updated files were generated using 1-km data and contain more detail.
  • 2019/03/12 Issue #2 Nest
  • The orography for the FV3NEST (tile 7) will be the same as that used for the FV3SAR.
  • This will eliminate differences in how the terrain is handled for both configurations.
  • 2019/03/07 Model Change Nest,SAR,
    SAR-DA
  • High resolution (~3-km) tiled surface data was inserted into the regional FV3 parallels.
  • Previously, Gaussian files on a ~13-km grid were being used as fix files for the 3-km model.
  • 2019/03/05 Issue #3 Nest,SAR,
    SAR-DA
  • Radiation and snow changes that were added to the FV3GFS master repository were added to the regional FV3 parallels.
  • 2019/02/25 Model Change Nest,SAR,
    SAR-DA
  • Forecasts are now initialized off of NCO's official FV3GFS parallel.
  • 2019/02/19 Issue #3 Nest,SAR,
    SAR-DA
  • The cold low-level temperature bias currently observed in the global FV3GFS is also apparent in the regional FV3 parallels.
  • 2019/01/31 Graphics Change Nest,SAR,
    SAR-DA
  • A Mid-Atlantic domain has been added.
  • The Northeast domain has been modified.
  • 2019/01/30 Issue #2 Nest
  • The FV3NEST contains a persistent warm/moist bias that is most prevalent over the Pacific northwest.
  • Preliminary investigations reveal the FV3SAR is closer to reality than the FV3NEST.
  • Differences in how terrain is handled in the FV3NEST vs the FV3SAR may be a contributing factor.
  • 2018/12/14 Graphics Change Nest,SAR
  • Individual plots for the 3-km FV3NEST runs have been removed.
  • Difference plots comparing the 3-km FV3SAR to the 3-km FV3NEST have been added.
  • 2018/12/10 Issue #1 SAR-DA
  • FV3SAR-DA runs contain significantly more noise in the first 6 hours of the forecast when compared to the FV3SAR runs.
  • The DA increments are likely introducing a model imbalance.
  • 2018/11/30 Graphics Change SAR,SAR-DA
  • Individual plots for the 3-km FV3SAR runs have been removed.
  • Difference plots comparing the 3-km FV3SAR coldstarted off the FV3GFS to the 3-km FV3SAR-DA with a 6-h data assimilation cycle have been added.
  • 2018/11/08 Model Change Nest,SAR
  • 3-km FV3SAR and 3-km FV3NEST forecasts have been moved from phase 2 to the Dell.
  • 2018/10/24 Model Change Nest,SAR
  • The central latitude of the domain was changed from 35.5N to 38.5N. This change will allow the 3 km HRRR output grid to have no undefined grid points outside the FV3 integration domain.
  • 2018/07/03 Model Change SAR
  • Official start of the 3-km FV3 stand-alone regional (FV3SAR) run. The forecast is coldstarted off of the FV3GFS using 3-hourly boundary conditions.
  • 2018/06/16 Model Change Nest
  • Forecasts are now initialized off of EMC's official FV3GFS parallel.
  • 2018/05/09 Model Change Nest
  • Reflectivity is now output directly from the GFDL microphysics scheme instead of using the GFDL-modified Stoelinga algorithm.
  • 2018/05/01 Model Change Nest
  • Official start of the 3-km FV3 CONUS nest (FV3NEST) run within the FV3GFS global domain.