<div dir="rtl"><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">Hi Dickson, </font></div><div style="text-align:left" dir="ltr"><br></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000"> I have model output for u and v components every 6 hours, and I want to ask you:</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">1- Is it better to calculate monthly mean of <span class="gmail-il">wind</span> <span class="gmail-il">direction</span> or calculate the prevailing <span class="gmail-il">wind</span> <span class="gmail-il">direction</span> in this month?</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">2- Does the monthly mean of the <span class="gmail-il">direction</span> give reasonable information?, since if you have a perfect east <span class="gmail-il">wind</span> and a perfect west <span class="gmail-il">wind</span> and you want to find the <span class="gmail-il">direction</span> of their average.</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">3- Is there any function in NCL to calculate the dominant <span class="gmail-il">wind</span> <span class="gmail-il">direction</span>?</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">4- How do you calculate the composite of wind direction? </font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000"><br></font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">Thank you in advance.</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000"><br></font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">Best regards,</font></div><div style="text-align:left" dir="ltr"><font face="arial, sans-serif" color="#000000">Zeinab  </font></div></div><br><div class="gmail_quote"><div dir="rtl" class="gmail_attr">‫في الجمعة، 22 مايو 2020 في 7:36 م تمت كتابة ما يلي بواسطة ‪dickson mbigi via ncl-talk‬‏ <‪<a href="mailto:ncl-talk@ucar.edu">ncl-talk@ucar.edu</a>‬‏>:‬<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Kindly hep/guidance,<div><div>I did composite analysis of wind data and I need to plot only significant wind vectors. So far, I went through a related thread "<a href="https://www.ncl.ucar.edu/Support/talk_archives/2010/1031.html" target="_blank">https://www.ncl.ucar.edu/Support/talk_archives/2010/1031.html</a>" but I couldnt figure out how to make it because it was not clear in this regard especially in carrying out t-test and subsequent plotting.</div><div><br></div><div>Attached is my script which actual contain the whole  idea from the mentioned thread on performing t-test (refer line 127-149). Actually, the script plots zonal wind anomalies and overlaid wind vectors (attached picture). </div></div><div><br></div><div>NB: Wind data is from NCEP-NCAR Reanalysis 1</div><div><br></div><div>I would highly appreciate for any help.</div><div><br></div><div><div id="gmail-m_5690277864243967559gmail-:s4" style="font-size:0.875rem;direction:ltr;margin:8px 0px 0px;padding:0px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><div id="gmail-m_5690277864243967559gmail-:s5" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif"><div dir="ltr"><div><div><div><em style="color:rgb(153,0,153);font-family:"Times New Roman";font-size:medium">Kindest regards,</em></div></div></div><div><em style="color:rgb(153,0,153);font-family:"Times New Roman";font-size:medium">Dickson Mbigi,</em></div><div><em style="color:rgb(153,0,153);font-family:"Times New Roman";font-size:medium">Institute of Atmospheric Physics,</em></div><div><em style="color:rgb(153,0,153);font-family:"Times New Roman";font-size:medium">Chinese Academy of Sciences, China.</em></div></div><div></div><div></div></div></div><div id="gmail-m_5690277864243967559gmail-:tt" style="margin:15px 0px;clear:both;font-size:0.875rem;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><br></div></div></div>
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