[ncl-talk] plotting spatial average of wind vector from wrf output
Dennis Shea
shea at ucar.edu
Sun Dec 26 17:05:28 MST 2021
I have no idea what *wrf_vector *is doing within the function. That
function was written by WRF developers.
Maybe, you could look
%> less .../.../WRFUserARW.ncl search for *wrf_vector*
-------------------------------------
NCL's *wind_direction *will return meteorological direction
*dir10_avg = wind_direction
<http://www.ncl.ucar.edu/Document/Functions/Contributed/wind_direction.shtml>(u10_avg,
v10_avg, 1) ; meteorological wind direction*
On Sun, Dec 26, 2021 at 12:28 AM sangeeta maharjan via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:
> Hi,
>
> I have been using " vector = wrf_vector(a,wks,u10,v10,opts)" for
> plotting wind vector distribution from wrf output.
>
> Inorder to plot the monthly average spatial wind vector distribution , I
> computed the average of u10_avg and v10_avg .
>
> On using the same function, " vector =
> wrf_vector(a,wks,u10_avg,v10_avg,opts)", I got a very odd plot
> distribution.
>
> As mentioned in "Technical note of averaging wind speed and direction" by
> Stuart K. Grange , average wind direction is arctan(u10_avg/v10_avg)+flow
>
> where flow =+ 180 for arctan (u10_avg/v10_avg) < 180
> =- + 180 for arctan (u10_avg/v10_avg) >180
>
> Could you kindly suggest how to plot wind vectors from averaged u and v
> components.
>
> Any help is appreciated.
>
> Kind regards,
> Sang
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