This suite selection is based on many years of real-time forecasting experiments over the Continental US, 
including the on-going 3-km ensembles conducted at NCAR:  

             mp_physics:      8,
             cu_physics:      6,
          ra_lw_physics:      4,
          ra_sw_physics:      4,
         bl_pbl_physics:      2,
      sf_sfclay_physics:      2,
     sf_surface_physics:      2,