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Mismatch between normal and restart simulations

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New member

I am using WRF4.0.3 for wind resource assessment.
During analysis, I found that result of WRF simulation with restart option is different from normal one without restart (normal one).

For example,
I ran one simulation for 1 month from 2019/01/01 00:00:00 to 2019/02/01 00:00:00 with "restart=false" and "restart_interval=60".
After the completion of the simulation, I ran it again from 2019/01/15 00:00:00 using restart option "restart=true".

Basically these result should be completely the same. However, I got two patterns of results.
Actually, the difference is not so critical, but I am curious about the reason why the restart option make the result different from original one.
Restart option is designed so that we can restart a simulation which is accidentally stopped by some reasons, isn't it?

I think this is derived from the number of digits of each variable in wrfrst files.
Writing all mandatory fields to wrfrst files may cause rounding off, I guess.

Do anyone have an idea to make the two simulation completely the same.

Thank you in advance

Best regards
Can you post your namelist.input for me to take a look?
When you restart the model, did you run with the same number of processors and same executable files?