Unless you're using OpenGrads, which might allow for defining a variable by grid point, you probably can't compute LFC height in any direct way. If you were somehow able to compute a vertical parcel path at each gridpoint, however, you could then use the fndlvl command (<a href="http://www.iges.org/grads/gadoc/gradfuncfndlvl.html">http://www.iges.org/grads/gadoc/gradfuncfndlvl.html</a>) to find the first vertical level at which the parcel temperature exceeds the environmental temperature. It's the first part that I can't think of a way to do.<br>
<br>If you are dealing with WRF output and you have the netCDF files, you can run ARWpost or WPP on them to get LFC calculated. Otherwise you might try using some other graphics software. Sorry I can't be of more help.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Wed, Apr 20, 2011 at 9:39 AM, Meredith Croke <span dir="ltr"><<a href="mailto:mcroke@airdat.com">mcroke@airdat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal">Hi Everyone,</p><p class="MsoNormal">I’m looking to plot a contour plot of LFC height, similar to the graphic on the SPC Mesoscale Analysis page, my control file does not output LFC directly, is there anyway I can calculate this in grads?</p>
<p class="MsoNormal"> </p><p class="MsoNormal">Thanks for your help.</p><p class="MsoNormal"> </p><font color="#888888"><p class="MsoNormal">Meredith</p></font></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Iowa State University<br>Meteorology Graduate Student<br>3134 Agronomy Hall<br><a href="http://www.meteor.iastate.edu/~jdduda">www.meteor.iastate.edu/~jdduda</a><br>