<div dir="ltr">I"m not sure what particular formula you're using, but I typically rely on the Bolton (1980), MWR and Davies-Jones (2008), MWR papers on computing equivalent potential temperature and wet bulb potential temperature for these purposes. Equations 3.3 and 3.4 in the latter reference give formulas for wet-bulb potential temperature as a function of equivalent potential temperature. The value of C in those equations is 273 K. Once you have theta-w, you can use the Poisson equation to derive the wet bulb temperature.<br><br>Jeff Duda<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 20, 2014 at 11:13 AM, Perry, Aaron @ LSC <span dir="ltr"><<a href="mailto:Aaron.Perry@lsc.vsc.edu" target="_blank">Aaron.Perry@lsc.vsc.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Good Afternoon All,</p>
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<p>I'm currently in need of a way to correctly calculate Wet-Bulb Temperature. I've been playing around with using Dew Point, Relative Humidity, and Surface Pressure but, it doesn't seem to be correct:</p>
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</p>
<p>'define tc = (tmp2m.1-273.15)'<br>
'define tdc = (dpt2m.1-273.15)'<br>
'define e = 6.11*pow(10,7.5*tdc/(237.7+tdc))'<br>
'define es = 6.11*pow(10,7.5*tc/(237.7+tc))'<br>
'define rh = (e/es)*100'<br>
</p>
<p>'define pres = pressfc.1'<br>
</p>
<p>'define w2 = 0.622*(e/pres)'<br>
'define wb = tc-(((((0.622*es)/pres)-w2)*2499)/(1.004+1.84*w2))'<br>
'define wetbulb = (wb*(9/5)+32)'<br>
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</font><font face="Verdana, Geneva, sans-serif" color="003366">Aaron D. Perry<br>
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Lyndon State College<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature">Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br></div>
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