Yeah, Bob, it seems rather esoteric. Just remember that the acronym NAM is just the name given to the mesoscale model to be used for operational weather forecasting in the US. It can take on any form, much like the T1000 from Terminator 2. In the past it was the eta model (although I think they just called it the eta back then). Then it was the WRF-NMM for awhile. Now it's the NMMB. But it's still just the "NAM".
