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<body class='hmmessage'><div dir='ltr'>Hi, <span style="color: rgb(68, 68, 68); font-size: 15px; line-height: 21.2999992370605px; background-color: rgb(255, 255, 255);">t850 needs to be set with "set lev 850, since the variable is "temperature on pressure surface"': how could I incorporate it in your command?</span><div><font color="#444444"><span style="font-size: 15px; line-height: 21.2999992370605px;"><br></span></font></div><div><font color="#444444"><span style="font-size: 15px; line-height: 21.2999992370605px;">Thank you very much<br></span></font><br><div><hr id="stopSpelling">From: msponsler@comcast.net<br>Date: Sun, 23 Aug 2015 19:07:19 -0700<br>To: gradsusr@gradsusr.org<br>Subject: Re: [gradsusr] visibility in wrf-nmm - possible solution<br><br><style><!--
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--></style>I think you've done it already:<br>
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First set up clevs and colors to suit your tastes<br>
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Then:<br>
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Define vis = -1.33 + 0.45((2(tsfc - t850)) + (2 (tsfc - tdsfc)) + (2(w850)))<br>
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Display sfc<br>
<br><br><div class="ecxgmail_quote">On August 23, 2015 4:58:51 PM PDT, giacomo tricarico <mino-98@hotmail.it> wrote:<blockquote class="ecxgmail_quote" style="border-left:1px solid rgb(204, 204, 204);padding-left:1ex;">
<div dir="ltr">Hi, since grads can not plot Visibility well, I have found a formula for calculating it:<div><br></div><div>Visibility = −1.33 + 0.45* FOGSI </div><div><br></div><div>where FOGSI is </div><div><span style="font-size:12pt;"><br></span></div><div><span style="font-size:12pt;">2 | Tsfc - T850 | + 2 ( Tsfc - Td sfc ) + 2 W850</span></div><div><span style="font-size:12pt;"><br></span></div><div><span style="font-size:12pt;">where </span></div><div><br></div><div>Tsfc=temperature near the surface,
Td sfc= dew point near the surface,
T850= temperature on 850 hPa level,
W 850 =wind speed on 850 hPa level. </div><div><a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.260&rep=rep1&type=pdf" target="_blank">http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.112.260&rep=rep1&type=pdf</a></div><div>Since grads can plot all the variables above, how could I generate visibility in grads using that formula?</div><div><br></div><div>Thanks all,</div><div>Giacomo</div> </div>
<p style="border-bottom:1px solid #000;"></p><pre class="ecxk9mail"><hr><br>gradsusr mailing list<br>gradsusr@gradsusr.org<br><a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br></pre></blockquote></div><br>
Thanks,<br>
Mark Sponsler<br>_______________________________________________
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