file_list
/fake/path/of/file/FCST_TILE_F012_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F018_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F000_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F006_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F048_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F024_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F042_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F030_gfs_4_20141214_0000_000.nc
/fake/path/of/file/FCST_TILE_F036_gfs_4_20141214_0000_000.nc