<div dir="ltr">The output variable is probably not what you think it is. In WRF a base temperature value (usually t0=290) is set, and the full theta field is based on a perturbation from that value. So what you are really looking at when you look at that variable is the distance the potential temperature is from 290 K (unless you set it otherwise, but 290 is the default value I think). For example, if theta prime = 50, then the potential temperature at that location is 340 K. You would then use the pressure value to compute the actual temperature.<div>
<br></div><div>Jeff Duda</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Sep 13, 2013 at 9:01 PM, Nimrod Micael <span dir="ltr"><<a href="mailto:nmicael@aggies.ncat.edu" target="_blank">nmicael@aggies.ncat.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I have theta prime or potential temperature perturbation variable available to me from WRF. However I am having issues on why it's only plotting positive values of theta and not the negative value when I clearly did a cross section through the squall line. </div>
<div><br></div><div>theta prime = <span style="background-color:rgb(225,235,242);color:rgb(51,51,51);font-family:'Lucida Grande','Trebuchet MS',Verdana,Helvetica,Arial,sans-serif;font-size:13px;line-height:18.1875px">"perturbation potential temperature (theta-t0)". Right?</span></div>
<div><br></div><div>So can you possibly explain what might possibly be wrong? Thanks. </div><span class="HOEnZb"><font color="#888888"><div><br></div><div><br></div><div><br></div><div><br></div>Nimrod Micael
</font></span></div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <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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