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NON accumulated precipitation

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Dear Supporters,
I run WRF on daily base, with 3 hourly output fields.
RAINC, RAINNC, RAINSH values are accumulated over 8 values (values increasing or at least constant along time).
Is there a way to output values NON accumulated?
The best option would be to define 3 new variables such as RAINC_TS, RAINNC_TS, RAINSH_TS (TS stands for time step) to include on the output or in a new stream output. I would like that at each time stamp in the hystory file the RAINC_TS, RAINNC_TS, RAINSH_TS refer to the precipitation of the 3 hours interval before.
Thank you very much.
Please take a loot at the option prec_acc_dt and related variables (prec_acc_nc, prec_acc_c, etc.). I believe this option can meet your needs.