<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">--- On <B>Sun, 28/3/10, See Hai Ooi <I><axl419@yahoo.com></I></B> wrote:<BR>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: See Hai Ooi <axl419@yahoo.com><BR>Subject: Re: [gradsusr] Help in showing the example of using fndlvl(), max() and maxloc()<BR>To: gradsusr@gradsurs.org<BR>Cc: sushantpuranik@gmail.com, Charles.Seman@noaa.gov, subra.kumar@gmail.com<BR>Date: Sunday, 28 March, 2010, 11:18 PM<BR><BR>
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<DIV>Hi Sushant,</DIV>
<DIV> </DIV>
<DIV> Sorry to inform you that the previous script happened to work (?) for 4 vertical pressure levels but it failed when the levels were reduced to three. I just emailed you a corrected version of the script under different subject heading and it works for any number of vertical pressure levels you need. </DIV>
<DIV> </DIV>
<DIV> It appears to me that you are interested to identify the low level jets over the Indian Ocean. What is your definition of llj ? Below is what I know about llj:-</DIV>
<DIV> </DIV><FONT face=Symbol><FONT face=Symbol>
<P align=left>· </FONT></FONT><FONT face="Times New Roman"><FONT face="Times New Roman">Fast moving current of air near the surface.</FONT></FONT><FONT face=Symbol><FONT face=Symbol>
<P align=left>· </FONT></FONT><FONT face="Times New Roman"><FONT face="Times New Roman">Large wind shear </FONT></FONT><FONT face="Times New Roman">above and below the jet level.</FONT><FONT face=Symbol><FONT face=Symbol>
<P align=left>· </FONT></FONT><FONT face="Times New Roman"><FONT face="Times New Roman">Maximum wind speed at least 12-16 m/s (peak speeds up to 30 m/s observed)</FONT></FONT><FONT face=Symbol><FONT face=Symbol>
<P align=left>· </FONT></FONT><FONT face="Times New Roman"><FONT face="Times New Roman">Wind speed above jet 50-75% or less of the maximum.</FONT></FONT><FONT face=Symbol><FONT face=Symbol>
<DIV>· </FONT></FONT><FONT face="Times New Roman" size=5><FONT face="Times New Roman" size=5><FONT size=2>Strong lateral shear on both sides. Width typically about 200-300 km.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> Using our corrected script for the lowest three levels (1000, 925 and 850 hPa), I obtained the following results over your defined area in January 2008 :-</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> time index maximum wind (m/s) level (hPa) location</FONT></DIV>
<DIV><FONT size=2> -------------- -------------------------- -------------- ------------</FONT></DIV>
<DIV><FONT size=2> 120 20.512 925 30N 37.5E</FONT></DIV>
<DIV><FONT size=2> 124 21.0772 925 17.5S 57.5E</FONT></DIV>
<DIV><FONT size=2> 128 18.4618 925 22.5N 52.5E</FONT></DIV>
<DIV><FONT size=2> 132 18.111 850 5N 50E</FONT></DIV>
<DIV><FONT size=2> 136 19.47 850 7.5S 77.5E</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> My above elaboration is meant merely to alert you to use the right script (might have been written by some other GrADS users) to attain your intended objective. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> To plot the path of your llj, you can write your results in a text file with the following format:-</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> date time xgrd ygrd max</FONT></DIV>
<DIV><FONT size=2> ... .... .... .... .....</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> Then write a script to read the text file with the following lines :-</FONT></DIV>
<DIV><FONT size=2> .............</FONT></DIV>
<DIV><FONT size=2> xpos = xgrd</FONT></DIV>
<DIV><FONT size=2> ypos = ygrd</FONT></DIV>
<DIV><FONT size=2> 'draw mark 1 'xpos' 'ypos' .2'</FONT></DIV>
<DIV><FONT size=2> ............</FONT></DIV>
<DIV><FONT size=2> </FONT></DIV>
<DIV><FONT size=2> Hope this helps.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Ooi</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV></FONT></FONT>- On <B>Sun, 28/3/10, sushant puranik <I><sushantpuranik@gmail.com></I></B> wrote:<BR><BR>From: sushant puranik <sushantpuranik@gmail.com><BR>Subject: Re: [gradsusr] Help in showing the example of using fndlvl(), max() and maxloc()<BR>To: "See Hai Ooi" <axl419@yahoo.com><BR>Date: Sunday, 28 March, 2010, 7:43 PM<BR></DIV>
<DIV>Hi Ooi<BR>Thank you for the script. It works .<BR>It gives me the maximum value of wind at particular level and also the point at which it is maximum.<BR><BR>Thank you for the script and also for the suggestions.<BR><BR>If you dont mind i would like to ask you one more question .<BR> How can i make a plot to see the path of a jet stream.<BR><BR>Any suggestions.<BR><BR>Thank you again <BR><BR>Sushant</DIV></TD></TR></TBODY></TABLE><BR>
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