<div dir="ltr"><div>Bill,</div><div> </div><div>You can get u and v wind components given wind<br> speed and wind direction by calculation. Try this formula:</div><div> </div><div>u = - windspeed*sin(wind direction*Pi/180)</div>
<div><div>v = - windspeed*cos(wind direction*Pi/180)</div><div> </div><div>You have to know the unit of the wind speed. Is it in m/s or knots? It should be in m/s in the above calculation.</div><div> </div><div>Hope that works for you.</div>
<div> </div><div>Abayomi</div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Apr 15, 2013 at 7:23 AM, Bill Reilly <span dir="ltr"><<a href="mailto:bill_reilly@compuserve.com" target="_blank">bill_reilly@compuserve.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello:<br>
<br>
I know how to display wind barbs using the standard u and v wind<br>
components (d u;v), but how do I display them when I'm just given wind<br>
speed and wind direction?... Nothing in the GrADS manual (or anywhere<br>
else) explains how to do this...<br>
<br>
I can plot the data perfectly using vector arrows, but I want to use<br>
barbs... Any ideas?<br>
<br>
Bill<br>
<br>
--<br>
--<br>
<br>
Bill Reilly<br>
<a href="tel:%28%2B34%29%20686-110-748" value="+34686110748">(+34) 686-110-748</a><br>
<br>
<a href="mailto:bill@passageweather.com">bill@passageweather.com</a><br>
<a href="http://www.passageweather.com" target="_blank">www.passageweather.com</a><br>
<br>
<a href="mailto:bill@brwebworks.com">bill@brwebworks.com</a><br>
<a href="http://www.brwebworks.com" target="_blank">www.brwebworks.com</a><br>
<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>
</blockquote></div><br><br clear="all"><br>-- <br><br><br> Trust in the Lord......<br>*******************************************************************************************<br>* Abayomi A. Abatan * +1 515 572 4490 (Home) *<br>
* Geo. and Atmos. Sci. * +1 515 294 1321 (Office) *<br>* Iowa State University, Ames * +1 515 203 9020 (Cell) *<br>* Iowa. USA. * *<br>
******************************************************************************************* <br><br>****************************************************************************************************<br>* Abayomi A. Abatan * 234-802-724-7846 (out of service) *<br>
* Fed. Univ. of Tech., * 234-803-217-8815 (out of service) *<br>* SEMS, PMB 704 Akure * *<br>* Ondo Nigeria. * *<br>
**************************************************************************************************** <br>
</div>