[ncl-talk] wind barbs in southern hemisphere

[Zilore Mumba]

Rick,Thank you very much. That command has no effect. The ncl command I am
using is: vector = wrf_vector(a,wks,u_plane,v_plane,opts). I have tried the
plotting commands used in barb_1.ncl
<https://www.ncl.ucar.edu/Applications/Scripts/barb_1.ncl> and barb_2.ncl
<https://www.ncl.ucar.edu/Applications/Scripts/barb_1.ncl>, both give
errors. This is because the way these two extract the u- and v-wind
components differs from the function I use.
I think the plotting funcion could be at the heart of my problem. I will
see how I can modify my script to use the barb_1.ncl plotting function.


Thank you very much for your time, and for the hint.

On Sat, Jun 1, 2019 at 10:36 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> 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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>
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