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--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'>Dear NCL’ers,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'>I have a question regarding the computation of winds in an annulus. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'>That is, say I have a center lat and lon : cenlat, cenlon <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'>limit = 2 ; In degrees <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'> b1 = cenlat-limit<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'> b2 = cenlat+limit<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'> b3 = cenlon-limit<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'> b4 = cenlon+limit<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Bell MT",serif'>This is what I use if want to average the winds in a box that <b>is 2 degrees on either side of the center</b> (4 degree x 4degree n total). <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'>uav = dim_avg_n(dim_avg_n(uu(tcount,:,{b1:b2},{b3:b4}),2),1)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'>However, what I am now interested in is averaging around an <b>annulus</b> (say between 4 degrees to 6 degrees from the center of the hurricane). What is the best way to do that? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'>Thank you, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'>Prashanth <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cambria Math",serif'><o:p> </o:p></span></p></div></body></html>