WRF Restart Files not produced at specified intervals

[mlwasserstein]

Hello:

I am running a WRF simulation which requires me to execute a restart run due to wall time restrictions. For some reason, though, despite specifying a restart_interval of 60 (1 hour), restart files are not produced at the exact hour:



This is problematic because when trying to execute a restart run which starts at 2019-03-22_20:00:03 (my latest restart time), my wrfout files are then not produced at exact hourly intervals, which is what I want (e.g. wrfout_d04_2019-03-23_02:29:55 gets produced). I suspect this issue is due to my very short time step of 4.05 s (namelist.input) attached, which is what I've needed to use to get the model to run successfully.

Is there any way I can remedy this issue and produce restart files at the exact hour, so that my wrfout files in a restart run are produced on the exact hour?

 

[kwerner]

Hi,
See Resolving issue with restart files writing out at wrong times and let us know if that resolves your issue.

 

[mlwasserstein]

Thanks for this suggestion. That did not resolve my issue. When I run the model, I still get restart files that are produced a few seconds off from 60 minute intervals.

 

[kwerner]

Apologies. The option I suggested is for issues with wrfout* files writing out at incorrect times during a restart, but I now see you were referring to the wrfrst* files during the initial run. I'm sorry for my oversight.

I believe the issue stems from the time_step you've chosen. You have

time_step                           = 4,
 time_step_fract_num                 = 5,
 time_step_fract_den                 = 100,

which doesn't divide evenly into 60 seconds. Try modifying that so that it does and see if that makes a difference.

 

[mlwasserstein]

Hello. Your solution worked! I changed the time step to 5, and the restart files are produced as I'd like. Thanks for your help.

 

[kwerner]

Great! Thank you for the update.