Wendell,<br>I can think of two ways:<br><br>1) an approximation for omega is -rho*g*w, where rho is air density at whatever height, g = 9.8, and w is vertical velocity in z-wind vertical velocity<br>2) Omega can also be approximated by using the 'vint' function. What you would do is vertically integrate divergence up to the level at which you want omega. For example, if you want 700 mb omega, you'd do 'd vint(psfc, hdivg(u,v), 700)'. Obviously make sure all of those expressions are in the same units.<br>
<br>Good luck.<br><br>Jeff Duda<br><br><div class="gmail_quote">On Mon, Oct 18, 2010 at 1:12 PM, Wendell Farias <span dir="ltr"><<a href="mailto:wendellrgf@yahoo.com.br">wendellrgf@yahoo.com.br</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div style="font-family: 'times new roman','new york',times,serif; font-size: 12pt; color: rgb(0, 0, 0);">
<div>Dear all,</div><div><br></div><div>I'm using the ARWpost and It don't calculate the vertical velocity Omega. How can I calculate the Omega on Grads?</div><div><br></div><div>Thank you in advance,</div><div>Wendell</div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Iowa State University<br>Meteorology Graduate Student<br>3134 Agronomy Hall<br><a href="http://www.meteor.iastate.edu/~jdduda">www.meteor.iastate.edu/~jdduda</a><br>