I am downscaling GFS .25deg to 9km for a medium to large domain. In the past I've used the .5deg GFS, which only offered time steps of 3-hours, while GFS .25deg offers 1-hour time steps.
I'm wondering, is there a significant advantage to model accuracy by increasing the boundary condition interval to 1-hour vs 3-hours? or should I just stick with 3-hours?