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Brian, The formulation for the frontogenesis equation is shown in the user guide documentation in APXB1 and APXB2 (see $NAWIPS/doc/User_guide/pdf). To modify the GEMPAK library pf functions, you would need to build the diostribution from source and refer to the $GEMPAK/source/gemlib/d*/ grid functions. Steve CHiswell Unidata User Support >From: Brian Jamison <address@hidden> >Organization: UCAR/Unidata >Keywords: 200412141911.iBEJBDlI013904 >Hi Steve, > >I was curious to know if the frontogenesis function FRNT is the >Petterssen equation or the Miller equation, and if it's Petterssen, >is there a way to convert it to the Miller? > > >Brian Jamison > > -- NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.