Thomas, The current distribution of GEMPAK 5.9.1 includes a major grid library rewrite, so the old version of 5.8.3a you are running may have other limitations. Can you try the increased LLMXGT changes using the current version? Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: PUO-682527 Department: Support GEMPAK Priority: Normal Status: Closed