Actually i have used frames_per_outfile=300000, but the problem is, we can generate 10000 timesteps per wrfout file, after then it won't update. that is the problem in wrf, external/io_netcdf/wrf_io.F90 line 48, integer , parameter :: MaxTimes = 10000.replace 10000 by some number again i need to do configure and compile again.
Instead of that can we Delete a single timestep (last time step) from a NetCDF(wrfout) file using nco. then it will simple for my work. Because today i just come to know how to concatenate two wrfout files.