Problem: When using a lat-lon projection for regional ARW domains, no topography is produced for areas west of the domain center when 30-second topography data is used.
Solution: This issue arises when using a lat-lon projection with the average_gcell interpolation scheme, which is the default in the GEOGRID.TBL for 30-second topography data. Either use a different resolution of geographical data, or remove the average_gcell(4.0) option from the GEOGRID.TBL.