@kekert OK, thanks so much, kekert. I actually looked at the hidden layers to see if it might be there, but didn't see it. I missed it in it's current location because it doesn't have a header like Radar & Satellite and I'm used to that one being at the top. It's really a terrific feature. And for what it's worth, the Rain Accumulation layer is dynamite for anticipating a system's next move. Way better than trump with a Sharpie. Thanks again for the help.

Topographic maps render "contour isolines" which are beautiful because they perfectly embrace the Earth relief (i.e. what users expect to get on screens as 3D Earth). I'm not sure isobaric surfaces (with or without isolines), would get better rendering than the Geoid itself (i.e. pretty ugly/useless for the most of users, I guess).