<DIV>Dear MacLeod and Jeremy,</DIV> <DIV>Why you did not use this formula</DIV> <DIV>'set gxout barb'</DIV> <DIV>'d u;v' or</DIV> <DIV>'d u;v; mag (u,v)'</DIV> <DIV>Many Thanks</DIV> <DIV>Naser<BR><BR><B><I>Mac MacLeod <mmacleod@SCOTIAWEATHER.COM></I></B> wrote:</DIV> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi Jeremy<BR><BR>Following is a formulation provided me by Dr. Brian Doty to calculate wind<BR>direction and speed utililizing the u component and the v component of the<BR>wind at any level.<BR><BR>This particular code piece is from a script that calcualtes the 10 metre<BR>wind output values for selected points from the GFS.<BR><BR>****** Calculate the 10 metre AGL wind direction and
speed<BR>************************************<BR><BR>'define spd10 = mag(u10,v10) '<BR><BR>'display spd10 '<BR><BR>WndSpd10 = subwrd(result,4)<BR><BR>WndSpd10 = math_format(fmt,WndSpd10)<BR><BR>'define d1 = -atan2(u10,-v10)*180/3.1416'<BR><BR>'define d2 = const(maskout(d1,d1),0,-u)'<BR><BR>'define d3 = const(360+maskout(d1,-d2),0,-u)'<BR><BR>'define dir10 = d2+d3'<BR><BR>'display dir10'<BR><BR>Wnddir10 = subwrd(result,4)<BR><BR>If (Wnddir10 < 1)<BR><BR>Wnddir10 = math_nint(360.0)<BR><BR>ELSE<BR><BR>Wnddir10 = math_format(fmt,Wnddir10)<BR><BR>ENDIF<BR><BR>The WndSpd10 = subwrd(result,4) then WndSpd10 = math_format(fmt,WndSpd10)<BR>and the section:<BR><BR>Wnddir10 = subwrd(result,4)<BR>If (Wnddir10 < 1)<BR><BR>Wnddir10 = math_nint(360.0)<BR><BR>ELSE<BR><BR>Wnddir10 = math_format(fmt,Wnddir10)<BR><BR>ENDIF<BR><BR>permit me to print out these values as integers.<BR><BR>All the best with this.<BR><BR>Regards,<BR><BR>Mac MacLeod<BR><BR>M.A.(Mac) MacLeod<BR>President and
General Manager,<BR>Scotia Weather Services Inc.<BR>192 Wyse Road, Suite 8,<BR>Dartmouth, Nova Scotia, B3A 1M9<BR>Tele: 902-468-3866<BR>Cell: 902-225-5747<BR>Fax: 902-461-1768<BR>E-mail: mmacleod@scotiaweather.com<BR>visit us at: www.scotiaweather.com<BR><BR><BR>----- Original Message -----<BR>From: "Jeremy Gaultier" <WEBMASTER@METEOROLOGIC.NET><BR>To: <GRADSUSR@LIST.CINECA.IT><BR>Sent: Friday, October 06, 2006 5:27 PM<BR>Subject: To calculate direction with Uwind and Vwind<BR><BR><BR>> Hello,<BR>><BR>> I seek a formulate to calculate the direction of the moderate wind to the<BR>> data Uwind and Vwind component coming from GFS on Nomads.<BR>> I did not find any formula on the Web, can you help me?<BR>><BR>> Thank you in advance.<BR>> Good day.<BR>><BR></BLOCKQUOTE><BR><BR><BR><DIV align=center><EM><STRONG><FONT color=#1b2c48>Kind Regards<BR>Naser Sarhan<BR>School of Environmental Sciences<BR>University of East Anglia<BR>Norwich NR4
7TJ<BR></FONT></STRONG><BR></EM><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR></DIV><p> 
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