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Hi Jesús, The GDI index formula is available now in the nightly release, the formula named: GalvezDavisonIndex(temp, rh) It based on the input parameters of temperature and relative humidity. I tested with GFS80 KM dataset and result is good. Please give it a try. Yuan Ticket Details =================== Ticket ID: OMI-310298 Department: Support IDV Priority: Normal Status: Open =================== 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.