[ncl-talk] wind barbs in southern hemisphere

[Rick Brownrigg]

Hi Zilore,

Yes, as cryptic as the line "*wmsetp*
<http://www.ncarg.ucar.edu//supplements/wmap/index.html#HEADING1-225>("wba",-62.0)"
seems, perhaps try that if you haven't already. I personally am not sure
how that's supposed to work, but Dennis must have some insight on that.  To
answer your question about what it all means, parts of NCL make use of a
lower-level software package called WMAP. NCL does a pretty good job of
setting parameters to that package, but wmsetp() is a means by which a user
can override those settings and control WMAP directly. The parameters that
one can override -- and the meaning of the "wba" parameter -- can be found
here:

    http://www.ncarg.ucar.edu//supplements/wmap/index.html#HEADING1-225

and general information about WMAP can be found here:

    http://www.ncarg.ucar.edu//supplements/wmap/index.html

BTW: what NCL function are you calling to draw the wind barbs?

--Rick

On Sat, Jun 1, 2019 at 10:57 AM Zilore Mumba <zmumba at gmail.com> wrote:

> I have rerun my WRF over a domain which goes across the equator. There is
> no change in the barbs north and south of the equator. I am interested in
> the command: *wmsetp*
> <http://www.ncarg.ucar.edu//supplements/wmap/index.html#HEADING1-225>("wba",-62.0)
>                    ; NH (default) is 62.0
> How is it used? Is it simply that line?
> Thanks
>
> On Fri, May 31, 2019 at 9:37 PM Dennis Shea <shea at ucar.edu> wrote:
>
>> Hopefully, somebody who knows about WRF graphics will respond.
>>
>> --
>> Perhaps, *before calling the WRF graphics*, try the low level NCAR
>> Graphics option:
>>
>>    *wmsetp*
>> <http://www.ncarg.ucar.edu//supplements/wmap/index.html#HEADING1-225>("wba",-62.0)
>>                    ; NH (default) is 62.0
>>
>> On Fri, May 31, 2019 at 1:20 PM Zilore Mumba <zmumba at gmail.com> wrote:
>>
>>> Dennis,
>>> Thanks very much. I have seen that barbs are drawn correctly for he
>>> southern and northern hemispheres on the link you gave.
>>>  I am drawing WRF output. My domain is entirely in the southern
>>> hemisphere but barbs are on the left. I use one of the sample wrf scripts
>>> which plots several levels in one script, though now I cannot remember
>>> which one.
>>> The barb color change works.
>>> Once more, thank you very much.
>>>
>>> On Fri, May 31, 2019 at 4:14 PM Dennis Shea <shea at ucar.edu> wrote:
>>>
>>>>
>>>>
>>>> [1]* http://www.ncl.ucar.edu/Applications/barb.shtml*
>>>> <http://www.ncl.ucar.edu/Applications/barb.shtml>
>>>>
>>>> If you are plotting over  grid, the Northern/Southern Hemisphere wind
>>>> barbs are *automatically* drawn to the left/right.
>>>> See the main figure, entitled "Default Wind Barbs"
>>>>
>>>> [2] vc resources:
>>>>
>>>>      vcMonoWindBarbColor=True  ; this is the default
>>>>
>>>> *vcWindBarbColor="red"      ; wind barb color*
>>>>
>>>> On Fri, May 31, 2019 at 4:48 AM Zilore Mumba <zmumba at gmail.com> wrote:
>>>>
>>>>> Dear all,
>>>>> especially the managers at ncl, I have two questions:
>>>>> 1. My wind barbs are drawn to the left of the wind, facing downstream.
>>>>> I am in the southern hemisphere where we have to have barbs to the right.
>>>>> 2. Is it possible to have barbs all red, or all any color. I have only
>>>>> seen colored by a scalar.
>>>>> hank you.
>>>>> _______________________________________________
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