Segmentation fault with DFI

[jzhu]

Hi!
I want to perform Digital Filter Initialization 12 hours before the forecast, but it didn't work when I add “&dfi_control” option.

Some other questions:
1. Was the DFI (backward and fordward integration) set to start from the initial time by default (2023071412 in my namelist)
2. Was the backward integration necessary? If so, did met_em.d01.* also need to be prepared in real.exe? (2023071312 - 2023071409 in my case)
3. Was the time of forward integration need to be half of that for backward integration?

 

[kwerner]

Hi,
1. Yes, by default, DFI uses the initial time on your simulation and calculates the backward and forward times from that point.
2. You do not need to prepare the WPS input for the backward integration period; however, you are having the integration go back for 24 hours. It should only go back to 1 hour, and then forward for half that time (i.e., a half hour foward).
3. Yes.

See the Running WRF Chapter of the Users' Guide and go to the DFI section for details.

 

[jzhu]

Hi,
1. Yes, by default, DFI uses the initial time on your simulation and calculates the backward and forward times from that point.
2. You do not need to prepare the WPS input for the backward integration period; however, you are having the integration go back for 24 hours. It should only go back to 1 hour, and then forward for half that time (i.e., a half hour foward).
3. Yes.

See the Running WRF Chapter of the Users' Guide and go to the DFI section for details.

Thanks!
Are there any mistake in my namelist settings? I have actually modified it according to the Users' Guide, but program seemed to have crashed and there were no obvious errors displayed, and I promised that the program could run successfully without “&dfi_control” option.

 

[kwerner]

Yes, I think you need to modify the DFI settings in the namelist to only have DFI running for an hour and 1/2. See how I've modified the options below.

 dfi_cutoff_seconds                  = 5400,
 dfi_bckstop_year                    = 2023,
 dfi_bckstop_month                   = 07,
 dfi_bckstop_day                     = 14,
 dfi_bckstop_hour                    = 11,
 dfi_bckstop_minute                  = 00,
 dfi_bckstop_second                  = 00,
 dfi_fwdstop_year                    = 2023,
 dfi_fwdstop_month                   = 07,
 dfi_fwdstop_day                     = 14,
 dfi_fwdstop_hour                    = 12,
 dfi_fwdstop_minute                  = 30,
 dfi_fwdstop_second                  = 00,