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With reuard to my previous question...I am looking for a way to do some parameters from significant levels. First...I know how to find the value of the wet adiabt at some level. I can use the temp and temp as the dew point (seeing it as saturated). That is easy. But how can I find it at all the significant levels between (say) 900mb and 600 mb. I can only use raobcon (or raobplot) for mandatory levels. Can I use some program to find the highest value of the desired number? I am sure I can by comparing two values then trying another. Also...To calculate LI from the upper air obs using the surface temp and dew point, I figure I have to find the value of the parcel at 500mb. If I tell McIDAS that theta-e of the surface is the value of this "theta-e at 500mb) if the temperature and dew point are the same, how do I do an inverse "theta-e"? Am I clear? Paul -- ****************************************************************************** * Paul L. Sirvatka | Office: (630) 942-2118; Lab: (630) 942-2590 * * Professor of Meteorology | COD Weather Lab: (630)-858-0032 * * College of DuPage | Address: 425 22nd St. Glen Ellyn, IL 60137 * ******************************************************************************