[ncl-talk] Computing daily minimum and maximum temperatures from WRF output

[Dennis Shea]

*calculate_daily_values*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_daily_values.shtml>
will
return the daily minimum of each day's input values.
It should work for any grid. For 24 hourly values, it will return the min
value.


===
As noted in the function's documentation, the

*Climate Data Operators (CDO)* <https://code.zmaw.de/projects/cdo>
operators will process all variables on the file. For example:

       *cdo daymean* foo_hourly.nc  foo_daily_mean.nc
       *cdo daymin * foo_hourly.nc  foo_daily_min.nc
       *cdo daymax * foo_hourly.nc  foo_daily_max.nc
       *cdo daysum * foo_hourly.nc  foo_daily_sum.nc

===
NCL also offers: *calculate_segment_values*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_segment_values.shtml>
Calculate segment (eg, pentad [5-day], weekly [7-day]) values from
high frequency temporal values.



On Tue, Jul 20, 2021 at 5:50 PM Rick Brownrigg via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Hi Zilore,
>
> I don't have an easy solution to share, and I'm not certain what your data
> looks like, but I would have to think the functions dim_min_n/dim_max_n
> would do what you want:
>
>     http://ncl.ucar.edu/Document/Functions/Built-in/dim_min_n.shtml
>
> http://ncl.ucar.edu/Document/Functions/Contributed/dim_min_n_Wrap.shtml
>
> The "Wrap" version preserves metadata, if that's important to your
> application. Perhaps someone else can suggest a better approach.
>
> Rick
>
>
> On Tue, Jul 20, 2021 at 3:36 PM Zilore Mumba via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Dear all,
>> I am wondering if someone could have a script to compute minimum and
>> maximum temperatures from WRF output, which they could share.
>> I am running WRFV4.0. I want to compute  surface  minimum and maximum
>> temperatures at all grid points so that I can plot them, for day 1 to 5.
>> The closest I came to getting help was the post here
>> https://www.ncl.ucar.edu/Support/talk_archives/2010/0541.html, but I am
>> still trying to adapt this to my needs. I am also not able to find any
>> suggestion of such a computation on the ncl website.
>> I will appreciate it if someone has an easy solution which they can share.
>> Thanks
>> Zilore Mumba
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