whydomyjointshurt Posted April 22, 2017 Share Posted April 22, 2017 Hi, my first post here! Just beginning to get into NWP. Wanted to understand the diff. between a GFS run (1 degree resolution) and the GEFS ensemble control run at the same time. For example, if I compare 12z runs from earlier today (21 April 2017): GEFS control analysis: File: gec00.t12z.pgrb2anl Message: "51:Temperature:K (instant):regular_ll:isobaricInhPa:level 100000 Pa:fcst time 0 hrs:from 201704211200:hi res cntl fcst" GFS analysis: File: gfs.t12z.pgrb2.1p00.anl Message: "227:Temperature:K (instant):regular_ll:isobaricInhPa:level 100000 Pa:fcst time 0 hrs:from 201704211200" I see that they vary by as much as 7 kelvin. Why aren't they exactly the same? I thought the ensemble control only adjusted for resolution, and was otherwise unperturbed. Since I'm comparing identical resolutions, I'd have expected them to be identical. Thank you. Link to comment Share on other sites More sharing options...
BlizzardWx Posted April 25, 2017 Share Posted April 25, 2017 The GFS deterministic run is the highest resolution run with the most accurate initial conditions. The control run is the same as the main GFS run except that it is run with a lower resolution, so that is how they are different. Link to comment Share on other sites More sharing options...
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