For example, NOAA's Rapid Refresh (RAP), North America Mesoscale (NAM), and Global Forecast System (GFS) models all provide the variable geopotential-height as an output. This implies some model for mean-sea-level. What model?
I'm ultimately trying to express the geopotential-height as geometric-height in WGS84.
To clarify, does RUC/RAP/GFS use WGS84 as its horizontal reference system with EGM96 (or other) as its geoid definition?