Visualizing HWRF/WRF-NMM wrfout files

I'm a new Vapor user and I'm trying to visualize Hurricane WRF (HWRF) output. I understand that Vapor can directly import WRF ARW produced wrfout data/files. The HWRF uses the WRF NMM core. The grid system used by WRF NMM core is a rotated lat/lon grid. When I try to import this file into Vapour I get the following error: Unclassified error: Code: 1 Message: Unsupported MAP_PROJ value : 203 Any one have any experience using Vapor to display HWRF/WRF-NMM data and tips they might wish to share