[gradsusr] Question about why the wind vectors barbs not showing up for the 0-6 KM Shear difference

[Nimrod Micael]

@Jeff,

I see but is it approximation? That's my understanding from Rich Thompson's
post. http://www.stormtrack.org/forum/archive/index.php/t-23323.html


On Sun, Sep 1, 2013 at 6:55 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> The contours are just the magnitude of the shear vector, but that's
> not the same as the difference in wind speed at two levels.
>
> On Sun, Sep 1, 2013 at 4:58 PM, Nimrod Micael <nmicael at aggies.ncat.edu>
> wrote:
> > I see what your saying Jeff. But what if you are interested in the
> magnitude
> > only of u and v and not the two separate u and v vectors. I am trying to
> get
> > a map like this....
> >
> > http://www4.ncsu.edu/~nwsfo/storage/cases/20100425/shr6_10042600.gif
> >
> > This doesnt have two separate vectors: u and v.
> >
> >
> >
> >
> >
> > On Sun, Sep 1, 2013 at 5:52 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> >>
> >> The way you're doing it, you're only computing the difference in wind
> >> speed between two layers.  If you're trying to calculate vertical wind
> >> shear, you should be calculating the vector difference, which is the
> >> difference in the components.  So you should have a delta-U wind
> >> component of the shear (u500-usfc) and a delta-V component of the
> >> shear (v500-vsfc).  Those are the two quantities you would display to
> >> get the vectors.
> >>
> >> Jeff
> >>
> >> On Sun, Sep 1, 2013 at 3:39 PM, Nimrod Micael <nmicael at aggies.ncat.edu>
> >> wrote:
> >> > I see Jeff. So then how would i make it to display the magnitude of
> u,v
> >> > for
> >> > 2 different levels then? Since I am taking the difference between the
> >> > 500 mb
> >> > wind and the sfc wind?
> >> >
> >> >
> >> >
> >> > On Sun, Sep 1, 2013 at 4:33 PM, Jeff Duda <jeffduda319 at gmail.com>
> wrote:
> >> >>
> >> >> displaying wind barbs requires two inputs in the display command
> >> >> (i.e., 'd u;v').  You are only supplying one.
> >> >>
> >> >> Jeff Duda
> >> >>
> >> >> On Sun, Sep 1, 2013 at 2:53 PM, Nimrod Micael <
> nmicael at aggies.ncat.edu>
> >> >> wrote:
> >> >> > The shaded is plotting fine but the wind barb is not showing up.
> Can
> >> >> > anyone
> >> >> > help me out why?
> >> >> >
> >> >> > 'set gxout shaded'
> >> >> > 'set lev 1000'
> >> >> > 's= mag(u,v)'
> >> >> > 'set lev 500'
> >> >> > 'a = mag (u,v)'
> >> >> > 'set cmin 20'
> >> >> > 'bulk = (a-s)*1.92'
> >> >> > 'd bulk'
> >> >> >
> >> >> > 'set gxout barb'
> >> >> > 'set lev 1000'
> >> >> > 'barbs= mag(u,v)'
> >> >> > 'set lev 500'
> >> >> > 'barba = mag (u,v)'
> >> >> > 'set cmin 20'
> >> >> > 'bulkb = (barba-barbs)*1.92'
> >> >> > 'd bulkb'
> >> >> >
> >> >> >
> >> >> > Wind vectors are not showing up. Why???
> >> >> >
> >> >> > Thanks.
> >> >> >
> >> >> > --
> >> >> > Nimrod Micael
> >> >> >
> >> >> > _______________________________________________
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> >> >> > gradsusr at gradsusr.org
> >> >> > http://gradsusr.org/mailman/listinfo/gradsusr
> >> >> >
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> Jeff Duda
> >> >> Graduate research assistant
> >> >> University of Oklahoma School of Meteorology
> >> >> Center for Analysis and Prediction of Storms
> >> >> _______________________________________________
> >> >> gradsusr mailing list
> >> >> gradsusr at gradsusr.org
> >> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >> >
> >> >
> >> >
> >> >
> >> > --
> >> > Nimrod Micael
> >> >
> >> > _______________________________________________
> >> > gradsusr mailing list
> >> > gradsusr at gradsusr.org
> >> > http://gradsusr.org/mailman/listinfo/gradsusr
> >> >
> >>
> >>
> >>
> >> --
> >> Jeff Duda
> >> Graduate research assistant
> >> University of Oklahoma School of Meteorology
> >> Center for Analysis and Prediction of Storms
> >> _______________________________________________
> >> gradsusr mailing list
> >> gradsusr at gradsusr.org
> >> http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
> >
> >
> > --
> > Nimrod Micael
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
> _______________________________________________
> gradsusr mailing list
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>



-- 
Nimrod Micael
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