<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Dear Mr Charles Seman,</DIV>
<DIV> </DIV>
<DIV> Thank you for explaining the use of fndlvl(). As I did not get the picture completely, I failed to use this function to obtain the maximum magnitude of the subtropical jet stream and its corresponding pressure level (e.g. 200 knots at 200 hPa over the defined area). <BR></DIV>
<DIV> The followings are what I did :-</DIV>
<DIV> </DIV>
<DIV> sdfopen d:\cdc\uvw\uwnd.2009.nc</DIV>
<DIV> sdfopen d:\cdc\uvw\vwnd.2009.nc</DIV>
<DIV> </DIV>
<DIV> set t 1</DIV>
<DIV> set lat 20 40</DIV>
<DIV> set lon 80 140</DIV>
<DIV> define wind=mag(uwnd,vwnd.2)</DIV>
<DIV> </DIV>
<DIV> ga-> d fndlvl(wind,max(wind,lev=1000,lev=100),lev=1000,lev=100)<BR> MAXing. dim = 2, start = 1, end = 12<BR> Constant field. Value = 1000<BR> ga-> d fndlvl(lev,max(wind,lev=1000,lev=100),lev=1000,lev=100)<BR> MAXing. dim = 2, start = 1, end = 12<BR> Cannot contour grid - all undefined values</DIV>
<DIV> </DIV>
<DIV> Where did I go wrong ? I did not fix the level to a single value else it would show "Cannot contour grid - all undefined values". Hope you can enlighten me.</DIV>
<DIV> </DIV>
<DIV> Regards.</DIV>
<DIV> </DIV>
<DIV>Ooi</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV></td></tr></table><br>
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