<div dir="ltr"><div>NCL does not have an explicit '<b>frontogenesis</b>' function.</div><div>Certainly, one could be written but, as far as I know, nobody has done this.<br></div><div>--------<br></div><div>NCL does have <b>'<a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/qvector_isobaric.shtml">qvector_isobaric</a></b>' and a variant  '<a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/qvector_isobaric_cfd.shtml"><b>qvector_isobaric_cfd</b></a>' <br></div><div><br></div><div>Q-vectors can be used to understand physical processes 
such as vertical motion and frontogenesis.</div><div><br></div><div>However, NCL's functions are for global grids and the needed terms are calculated using spherical harmonics. <br></div><div>These <b>can not</b> be used for WRF grids.</div><div><br></div><div>--------</div><div>Perhaps, the WRF community can offer some assistance.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Aug 8, 2021 at 3:09 PM Tianhang Zhang via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">




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<span style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)">Hi, </span>
<div style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)">I would like to know how to use NCL to calculate frontogenesis using wrf data. Do you have any scripts? </div>
<div style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)">Thank you</div>
<div style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)"><br>
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<div style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)">Best, </div>
<span style="margin:0px;font-size:12pt;background-color:rgb(255,255,255)">Tianhang</span><br>
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