The Mellor–Yamada–Nakanishi–Niino (MYNN) Eddy Diffusivity-Mass Flux (EDMF) planetary boundary layer (PBL) scheme has been used in the operational High-Resolution Rapid Refresh (HRRR) since 2014. It has been developed primarily to help provide operational short-range convection-allowing forecasts for the contiguous United States (CONUS). This scheme has been selected for inclusion within the set of advanced experimental physical parameterizations in support of the Unified Forecast System (UFS). This expanded scope requires testing the MYNN-EDMF at much longer forecast lead times, at much longer time steps, over more regions of the Earth, and within a new dynamical core. The characterization of model errors specific to the MYNN-EDMF has been accomplished since its implementation into the FV3/CCPP framework, and subsequent development has progressed for improving clouds, solar radiation, and many other sensible weather variables for this expanded application scope. This presentation will overview key features of the MYNN-EDMF and highlight some recent development activities and associated performance examples. Successes and remaining challenges are identified for further research.
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