EMC's Model Evaluation Group

 The Model Evaluation Group (MEG) community is established to interact with the user community on issues related to the forecast systems of NCEP's Environmental Modeling Center (EMC).    It is used to discuss overall model performance and provide feedback on operational and parallel versions of the models which comprise the production suite.

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RE: 00Z 2-m Temps consistently colder in FV3 over higher terrain

RE: 00Z 2-m Temps consistently colder in FV3 over higher terrain
Answer
10/23/17 2:18 PM as a reply to Timothy Barker.

Wow, those are large differences. The site has an archive back to the end of August. It's hit-or-miss which cycles are available, but the 12Z 24 August cycle is there for example, and it does not display the same 2-m temperature behavior. The EMC FV3 parallel is continually changing, so it seems a change was recently introduced that is causing these differences. I've asked the developers if there is a change log that can be shared with the group.

I've also attached a plot of differences between the GFS and FV3-GFS terrain I made to investigate the temperature differences. Like other fields, the FV3 terrain appears smoother than the GFS terrain. It is unlikely the smoothness is causing large temperature differences, but it is still an oddity that I'd like to understand. I've directed a question about the terrain smoothness toward the FV3 developers.