<div dir="ltr">@Jeff,<div><br></div><div>I see but is it approximation? That's my understanding from Rich Thompson's post. <a href="http://www.stormtrack.org/forum/archive/index.php/t-23323.html">http://www.stormtrack.org/forum/archive/index.php/t-23323.html</a></div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Sep 1, 2013 at 6:55 PM, Jeff Duda <span dir="ltr"><<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The contours are just the magnitude of the shear vector, but that's<br>
not the same as the difference in wind speed at two levels.<br>
<div class="HOEnZb"><div class="h5"><br>
On Sun, Sep 1, 2013 at 4:58 PM, Nimrod Micael <<a href="mailto:nmicael@aggies.ncat.edu">nmicael@aggies.ncat.edu</a>> wrote:<br>
> I see what your saying Jeff. But what if you are interested in the magnitude<br>
> only of u and v and not the two separate u and v vectors. I am trying to get<br>
> a map like this....<br>
><br>
> <a href="http://www4.ncsu.edu/~nwsfo/storage/cases/20100425/shr6_10042600.gif" target="_blank">http://www4.ncsu.edu/~nwsfo/storage/cases/20100425/shr6_10042600.gif</a><br>
><br>
> This doesnt have two separate vectors: u and v.<br>
><br>
><br>
><br>
><br>
><br>
> On Sun, Sep 1, 2013 at 5:52 PM, Jeff Duda <<a href="mailto:jeffduda319@gmail.com">jeffduda319@gmail.com</a>> wrote:<br>
>><br>
>> The way you're doing it, you're only computing the difference in wind<br>
>> speed between two layers. If you're trying to calculate vertical wind<br>
>> shear, you should be calculating the vector difference, which is the<br>
>> difference in the components. So you should have a delta-U wind<br>
>> component of the shear (u500-usfc) and a delta-V component of the<br>
>> shear (v500-vsfc). Those are the two quantities you would display to<br>
>> get the vectors.<br>
>><br>
>> Jeff<br>
>><br>
>> On Sun, Sep 1, 2013 at 3:39 PM, Nimrod Micael <<a href="mailto:nmicael@aggies.ncat.edu">nmicael@aggies.ncat.edu</a>><br>
>> wrote:<br>
>> > I see Jeff. So then how would i make it to display the magnitude of u,v<br>
>> > for<br>
>> > 2 different levels then? Since I am taking the difference between the<br>
>> > 500 mb<br>
>> > wind and the sfc wind?<br>
>> ><br>
>> ><br>
>> ><br>
>> > On Sun, Sep 1, 2013 at 4:33 PM, Jeff Duda <<a href="mailto:jeffduda319@gmail.com">jeffduda319@gmail.com</a>> wrote:<br>
>> >><br>
>> >> displaying wind barbs requires two inputs in the display command<br>
>> >> (i.e., 'd u;v'). You are only supplying one.<br>
>> >><br>
>> >> Jeff Duda<br>
>> >><br>
>> >> On Sun, Sep 1, 2013 at 2:53 PM, Nimrod Micael <<a href="mailto:nmicael@aggies.ncat.edu">nmicael@aggies.ncat.edu</a>><br>
>> >> wrote:<br>
>> >> > The shaded is plotting fine but the wind barb is not showing up. Can<br>
>> >> > anyone<br>
>> >> > help me out why?<br>
>> >> ><br>
>> >> > 'set gxout shaded'<br>
>> >> > 'set lev 1000'<br>
>> >> > 's= mag(u,v)'<br>
>> >> > 'set lev 500'<br>
>> >> > 'a = mag (u,v)'<br>
>> >> > 'set cmin 20'<br>
>> >> > 'bulk = (a-s)*1.92'<br>
>> >> > 'd bulk'<br>
>> >> ><br>
>> >> > 'set gxout barb'<br>
>> >> > 'set lev 1000'<br>
>> >> > 'barbs= mag(u,v)'<br>
>> >> > 'set lev 500'<br>
>> >> > 'barba = mag (u,v)'<br>
>> >> > 'set cmin 20'<br>
>> >> > 'bulkb = (barba-barbs)*1.92'<br>
>> >> > 'd bulkb'<br>
>> >> ><br>
>> >> ><br>
>> >> > Wind vectors are not showing up. Why???<br>
>> >> ><br>
>> >> > Thanks.<br>
>> >> ><br>
>> >> > --<br>
>> >> > Nimrod Micael<br>
>> >> ><br>
>> >> > _______________________________________________<br>
>> >> > gradsusr mailing list<br>
>> >> > <a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
>> >> > <a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>> >> ><br>
>> >><br>
>> >><br>
>> >><br>
>> >> --<br>
>> >> Jeff Duda<br>
>> >> Graduate research assistant<br>
>> >> University of Oklahoma School of Meteorology<br>
>> >> Center for Analysis and Prediction of Storms<br>
>> >> _______________________________________________<br>
>> >> gradsusr mailing list<br>
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>> ><br>
>> ><br>
>> ><br>
>> ><br>
>> > --<br>
>> > Nimrod Micael<br>
>> ><br>
>> > _______________________________________________<br>
>> > gradsusr mailing list<br>
>> > <a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
>> > <a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
>> ><br>
>><br>
>><br>
>><br>
>> --<br>
>> Jeff Duda<br>
>> Graduate research assistant<br>
>> University of Oklahoma School of Meteorology<br>
>> Center for Analysis and Prediction of Storms<br>
>> _______________________________________________<br>
>> gradsusr mailing list<br>
>> <a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
>> <a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
><br>
><br>
><br>
><br>
> --<br>
> Nimrod Micael<br>
><br>
> _______________________________________________<br>
> gradsusr mailing list<br>
> <a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
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><br>
<br>
<br>
<br>
--<br>
Jeff Duda<br>
Graduate research assistant<br>
University of Oklahoma School of Meteorology<br>
Center for Analysis and Prediction of Storms<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>Nimrod Micael
</div>