At the old Black Forest another pilot came back from his orientation flight reporting:
Almost instantly, the horizon was going up and down, and the towplane was inverted relative to the glider. They both completed the roll on tow, and continued to the wave.

Rotor happens everywhere. Wave is optional.
Jim


On Tuesday, November 17, 2015 at 1:23:47 PM UTC-8, son_of_flubber wrote:
Does east of the Front Range get low altitude rotor without wave conditions? Or does that only happen between two ridges with a height differential?