I am running some test forecasts using WRF 3.6.1. and am having some problems with my grids. Specifically, I am specifying a parent and nest domain each with 25 points for longitude and latitude (so that there is a point right at the middle of the inner domain and the parent grid points are coincident with inner grid points with a 3:1 nesting ratio).

I would expect an output of 25 by 25 points for each domain. however, I am only getting 24 by 24 points as output. In fact if I look at the geom_em or met_em netcdf files generated by WPS I already get only grids with 24 by 24 points.

What's going on?

Here is the geogrid section of my namelist.wps file:

&geogrid
 parent_id         =   1,   1,
 parent_grid_ratio =   1,   3,
 i_parent_start    =   1,  9,
 j_parent_start    =   1,  9,
 s_we              =   1,  1,
 e_we              =  25, 25,
 s_sn              =   1,  1,
 e_sn              =  25,  25,
 geog_data_res     = '10m','2m',
 dx = 18000,
 dy = 18000,
 map_proj = 'lambert',
 ref_lat   =  53.526,
 ref_lon   =  -113.529,
 truelat1  =  53.526,
 truelat2  =  53.526,
 stand_lon =  -113.529,
 geog_data_path = '/media/data/WRF3.6.1/data/geog/'
/