<div dir="ltr"><div><div><div>Hello dear users,<br><br></div>I am fairly new to wrf and I am working over the wrf online tutorial on the Katrina case study that uses one way nesting employing  ndown However, after getting the necessary input for ndown from real.exe and <span style="font-family:&quot;Courier New&quot;">renaming wrfinput_d02</span> file
to <span style="font-family:&quot;Courier New&quot;">wrfndi_d02, I am getting an error when I run ndown.exe that says,&quot;program ndown: opening too many files.&quot;<br></span></div><span style="font-family:&quot;Courier New&quot;">Your help is highly appreciated.<br>
<br>-------------- FATAL CALLED ---------------<br> FATAL CALLED FROM FILE:  &lt;stdin&gt;  LINE:     358<br> <span style="color:rgb(255,0,0)"><b>program ndown: opening too many files</b></span><br> -------------------------------------------<br>
Abort(1) on node 0 (rank 0 in comm 1140850688): application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0<br><br></span></div><span style="font-family:&quot;Courier New&quot;">;This is the namelist.input file<br><br> &amp;time_control<br>
 io_form_auxinput2 = 2<br> run_days                            = 0,<br> run_hours                           = 12,<br> run_minutes                         = 0,<br> run_seconds                         = 0,<br> start_year                       = 2005, 2005, 2000,<br>
 start_month                        = 08,   08,   01,<br> start_day                          = 28,   28,   24,<br> start_hour                         = 00,   00,   12,<br> start_minute                       = 00,   00,   00,<br>
 start_second                       = 00,   00,   00,<br> end_year                         = 2005, 2005, 2000,<br> end_month                          = 08,   08,   01,<br> end_day                            = 29,   29,   25,<br>
 end_hour                           = 00,   00,   12,<br> end_minute                         = 00,   00,   00,<br> end_second                         = 00,   00,   00,<br> interval_seconds                    = 21600<br> input_from_file              = .true.,.true.,.true.,<br>
 history_interval               = 120,  120,   60,<br> frames_per_outfile              = 1000, 1000, 1000,<br> restart                             = .false.,<br> restart_interval                    = 5000,<br> io_form_history                     = 2<br>
 io_form_restart                     = 2<br> io_form_input                       = 2<br> io_form_boundary                    = 2<br> debug_level                         = 0<br><br> /<br><br> &amp;domains<br> time_step                           = 180,<br>
 time_step_fract_num                 = 0,<br> time_step_fract_den                 = 1,<br> max_dom                             = 2,<br> e_we                            = 98,    118,   94,<br> e_sn                            = 70,    103,    91,<br>
 e_vert                           = 30,    30,    30,<br> p_top_requested                    = 5000,<br> num_metgrid_levels                  = 27,<br> num_metgrid_soil_levels             = 4,<br> dx                        = 30000, 9000,  3333.33,<br>
 dy                        = 30000, 9000,  3333.33,<br> grid_id                           = 1,     2,     3,<br> parent_id                        = 0,     1,     2,<br> i_parent_start                   = 1,     35,    30,<br>
 j_parent_start                   = 1,     23,    30,<br> parent_grid_ratio                = 1,     3,     3,<br> parent_time_step_ratio           = 1,     3,     3,<br> feedback                         = 1,<br> smooth_option                    = 0<br>
 /<br><br> &amp;physics<br> mp_physics                        = 3,     3,     3,<br> ra_lw_physics                     = 1,     1,     1,<br> ra_sw_physics                     = 1,     1,     1,<br> radt                             = 30,    30,    30,<br>
 sf_sfclay_physics                 = 1,     1,     1,<br> sf_surface_physics                = 2,     2,     2,<br> bl_pbl_physics                    = 1,     1,     1,<br> bldt                              = 0,     0,     0,<br>
 cu_physics                       = 1,     1,     0,<br> cudt                             = 5,     5,     5,<br> isfflx                             = 1,<br> ifsnow                              = 1,<br> icloud                              = 1,<br>
 surface_input_source                = 1,<br> num_soil_layers                     = 4,<br> sf_urban_physics                 = 0,     0,     0,<br> /<br><br> &amp;fdda<br> /<br><br> &amp;dynamics<br> w_damping                           = 0,<br>
 diff_opt                      = 1,      1,      1,<br> km_opt                        = 4,      4,      4,<br> diff_6th_opt                  = 0,      0,      0,<br> diff_6th_factor              = 0.12,   0.12,   0.12,<br>
 base_temp                           = 290.<br> damp_opt                            = 0,<br> zdamp                       = 5000.,  5000.,  5000.,<br> dampcoef                    = 0.2,    0.2,    0.2<br> khdif                       = 0,      0,      0,<br>
 kvdif                       = 0,      0,      0,<br> non_hydrostatic           = .true., .true., .true.,<br> moist_adv_opt              = 1,      1,      1,     <br> scalar_adv_opt              = 1,      1,      1,     <br>
 /<br><br> &amp;bdy_control<br> spec_bdy_width                      = 5,<br> spec_zone                           = 1,<br> relax_zone                          = 4,<br> specified                 = .true., .false.,.false.,<br>
 nested                    = .false., .true., .true.,<br> /<br><br> &amp;grib2<br> /<br><br> &amp;namelist_quilt<br> nio_tasks_per_group = 0,<br> nio_groups = 1,<br> /<br><br></span></div>