[Wrf-users] basic doubt in namelist.input options

[Don Morton]

Hello,

history_interval is how often wrf outputs the variables.  Typical values
might be every hour, or three hours, or six hours.

frames_per_outfile - is the number of output times in a single wrfout file.
 Some people like to put all their output times in a single file.  The file
gets huge, but some people think it's easier to open only a single file
when post-processing.  In such a case, people might choose a very large
value for frames_per_outfile, just to make sure that all output times go
into the single file..  Others, like me, choose to have a single output
time per output file (frames_per_outfile = 1)

You can see a sample namelist.input and resulting output files at

http://weather.arsc.edu/Operational/HRRR-AK/Products/wrfout/2013070200/


I set history_interval to 60  minutes, and frames per outfile to 1.


If I wanted all of my output in a single file, like

wrfout_d01_2013-07-02_00:00:00

then history_interval would still be 60 minutes, but I would set frames per
outfile to AT LEAST 49, for a 48 hour forecast, or maybe just set it to
100000 and never worry about whether it's big enough.  Again, though, you
may end up with a huge file, and I, personally, prefer working with a
single file per output time.

Best,

Don



On Tue, Aug 6, 2013 at 3:56 PM, Tabish Ansari <tabishumaransari at gmail.com>wrote:

> Hello
>
> Could you please clarify what is the difference between history_interval
> and frames_per_outfile and what do they represent?
>
> A detailed reply will be highly appreciated.
>
> --
> Thanks & Regards
> Tabish Umar Ansari
> MS Research Scholar
> Environmental & Water Resources Engineering Division
> Department of Civil Engineering
> IIT Madras
>
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> Wrf-users at ucar.edu
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>
>


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Arctic Region Supercomputing Center
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