Exaggerated Rain Forecast with NMM

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norulz
Posts: 95
Joined: Thu Mar 12, 2015 1:43 pm

Exaggerated Rain Forecast with NMM

Post by norulz » Fri Jun 26, 2015 1:45 pm

Hello all,

I run a daily 12km with a 4km nest of the East Mediterranean and I am getting rather exaggerated forecasts for rain which is usually rare at this time of the year. (The amounts of precipitation forecast are small).

Does anyone have any recommendations regarding tweaking my physics setting or other "usual suspects"?
Following is my namelist.wrfm for this run.

Thanks,
David

Code: Select all

&time_control
 start_year                 = 2015, 2015
 start_month                = 06, 06
 start_day                  = 26, 26
 start_hour                 = 00, 00
 start_minute               = 00, 00
 start_second               = 00, 00
 tstart                     = 00, 00
 end_year                   = 2015, 2015
 end_month                  = 06, 06
 end_day                    = 30, 28
 end_hour                   = 00, 00
 end_minute                 = 00, 00
 end_second                 = 00, 00
 tstart                     = 00, 00
 analysis                   = .false.
 interval_seconds           = 10800
 history_interval           = 60, 30
 history_outname            = "wrfout_d<domain>_<date>"
 frames_per_outfile         = 1, 1
 restart                    = F
 restart_interval           = 11520
 reset_simulation_start     = F
 io_form_input              = 2
 io_form_history            = 2
 io_form_restart            = 2
 io_form_boundary           = 2
 auxhist1_outname           = "auxhist1_d<domain>_<date>"
 auxhist1_interval          = 0, 0
 frames_per_auxhist1        = 1, 1
 io_form_auxhist1           = 2
 auxinput1_inname           = "met_nmm.d<domain>.<date>"
 auxhist2_outname           = "auxhist2_d<domain>_<date>"
 auxhist2_interval          = 0, 0
 frames_per_auxhist2        = 1, 1
 io_form_auxhist2           = 5
 write_input                = F
 adjust_output_times        = T
 debug_level                = 0
/

&domains
 time_step                  = 25
 time_step_fract_num        = 0
 time_step_fract_den        = 10
 time_step_dfi              = 60
 max_dom                    = 2
 grid_allowed               = T, T
 s_we                       = 1, 1
 e_we                       = 86, 82
 s_sn                       = 1, 1
 e_sn                       = 164, 220
 s_vert                     = 1, 1
 e_vert                     = 45, 45
 dx                         = 0.0771470, 0.0257157
 dy                         = 0.0766960, 0.0255653
 grid_id                    = 1, 2
 parent_id                  = 0, 1
 i_parent_start             = 1, 30
 j_parent_start             = 1, 46
 parent_grid_ratio          = 1, 3
 parent_time_step_ratio     = 1, 3
 num_metgrid_levels         = 27
 num_metgrid_soil_levels    = 4
 p_top_requested            = 5000
 ptsgm                      = 42000.
 num_moves                  = 0
 feedback                   = 0
 smooth_option              = 0
 numtiles                   = 1
 nproc_x                    = -1
 nproc_y                    = -1
/

&physics
 mp_physics                 = 5, 5
 ra_lw_physics              = 99, 99
 ra_sw_physics              = 99, 99
 nrads                      = 72, 216
 nradl                      = 72, 216
 co2tf                      = 1
 sf_sfclay_physics          = 2, 2
 sf_surface_physics         = 2, 2
 sf_urban_physics           = 0, 0
 num_land_cat               = 24
 num_soil_cat               = 16
 bl_pbl_physics             = 2, 2
 nphs                       = 4, 12
 cu_physics                 = 1, 0
 ncnvc                      = 4, 12
 tprec                      = 97, 97
 theat                      = 97, 97
 tclod                      = 97, 97
 trdsw                      = 97, 97
 trdlw                      = 97, 97
 tsrfc                      = 97, 97
 pcpflg                     = F, F
 num_soil_layers            = 4
 rdmaxalb                   = T
 rdlai2d                    = F
 mp_zero_out                = 0
 seaice_threshold           = 271
 gwd_opt                    = 0
 sst_update                 = 0
/

&noah_mp
/

&dynamics
 non_hydrostatic            = T
 coac                       = 1.6
 codamp                     = 6.4
 slophc                     = 0.006364
 euler_adv                  = T
 idtadt                     = 2
 idtadc                     = 2
/

&dfi_control
 dfi_opt                    = 0
/

&bdy_control
 spec_bdy_width             = 1
 specified                  = T, F
 nested                     = F, T
/

&grib2
/

&namelist_quilt
 nio_tasks_per_group        = 0
 nio_groups                 = 1
/

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