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Mohan At 12:06 PM 2/12/2002, you wrote:
>From: Mohan Ramamurthy <address@hidden> >Organization: UCAR/Unidata >Keywords: 200202121635.g1CGZvx09773 > >>Chiz, > >A quick questions: How do I plot the isallobaric wind? That is, what is >the argument to ISAL? >Is it the isallobaric field or something else? > >Thanks, > >Mohan > > >---------------------------------------------------------------------------->Dr. Mohan Ramamurthy e-mail: address@hidden> c.edu >Associate Professor Ph: (217) 333-8650 >Department of Atmospheric Sciences Fax: (217) 244-4393 >University of Illinois at Urbana-Champaign >105 S. Gregory Street >Urbana, IL 61801-3070 > Mohan, On a pressure surface, it is generally ISAL(HGHT). Or, simply ISAL. The function will compute the Geostropic wind from the scalar to ISAL(S), so most often you would use HGHT to compute the geostrophic wind. ISAL is also one of those predefined variables that will try to compute as just ISAL without any arguments (like WND, GEO, AGE, etc). The isallobaric wind requires a time difference, so gdattim is 2 times time1:time2. As an exaple using GDPLOT2: GDFILE = ETA GDATTIM = f000:f024 GVCORD = pres GLEVEL = 700 TYPE = a WIND = ak6 etc... Steve Chiswell **************************************************************************** < Unidata User Support UCAR Unidata Program < (303)497-8644 P.O. Box 3000 < address@hidden Boulder, CO 80307 < ---------------------------------------------------------------------------- < Unidata WWW Service http://www.unidata.ucar.edu/ <**************************************************************************** <