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Tony, Yes, you need grids on THTA surfaces. You can use gddiag to interpolate pressure level grids to THTA coordinate grids for isentropic analyses. The on line help for gddiag shows an example using gvcord=PRES/THTA. I also included an example in the tutorial on gddiag. Steve Chiswell >From: rockwooa <address@hidden> >Organization: UCAR/Unidata >Keywords: 200209302248.g8UMmR109314 >Steve, > >Can you tell me what steps are necessary to create a plan view map of the >variation of pressure on an isentropic surface? I presume this is one of the >functions meant for the "isentropic" button in the Model Plan View menu and >maybe I'm not getting the grids necessary to plot them, but any guidance will >be appreciated. > >Thanks, > >Tony > >**************************************************************************** > Anthony A. Rockwood > Metropolitan State College of Denver > Meteorology Program > Dept.of Earth and Atmospheric Sciences > P.O. Box 173362, Campus Box 22 > Denver, CO 80217-3362 > > Office: 303.556.8399 > fax: 303.556.4436 > > address@hidden > www.mscd.edu/~eas > >**************************************************************************** >