For example, I recently had an FO ask me how I knew there was turbulence coming up crossing the Rockies into Edmonton when none had been drawn on any of the maps. I explained that, while it was smooth as silk at cruise, the wind was on our back at 80 knots and this would generate turbulence in the lee of the hills.
A while ago I asked a glider-pilot friend of mine, who is also a Captain in a Teal-coloured airline, about his experience with wave, while flying over the Rockies. He explained some of his techniques for dealing with it. He mentioned that a lot of his FOs hadn't a clue about wave, but they understood what he meant when he mentioned "the speed bumps west of Lethbridge"!