<div dir="ltr">Try this;<div><br></div><div>'sdfopen <a href="http://nomads.ncep.noaa.gov:9090/dods/gfs_0p25/gfs20171104/gfs_0p25_06z">http://nomads.ncep.noaa.gov:9090/dods/gfs_0p25/gfs20171104/gfs_0p25_06z</a>'</div><div>'set gxout shaded'</div><div>'d hgttop0c'</div><div><br></div><div>This gives you freezing level in meters.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-11-04 19:37 GMT+03:00 Steve Young <span dir="ltr"><<a href="mailto:shy9@earthlink.net" target="_blank">shy9@earthlink.net</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="#0563C1" vlink="#954F72"><div class="m_-3893469585647877680WordSection1"><p class="MsoNormal">I am trying to use GrADS to determine the freezing level in meters (or feet). I can use the following to determine the upper air surface where T=273.16 but am unable to figure out how to calculate/extract/determine HGT(LEV=H). This command gives an error of invalid expression. I welcome any suggestions.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">'set gxout shaded'<u></u><u></u></p><p class="MsoNormal">'H=fndlvl(air, const(air, 273.16), Lev=1000, lev=400)'<u></u><u></u></p><p class="MsoNormal">'d H'<u></u><u></u></p><p class="MsoNormal">'run cbar'<u></u><u></u></p></div></div><br>______________________________<wbr>_________________<br>
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