Rotor/wave clouds in Colorado/'Kelvin-Helmholz'

Two years ago I photographed a long set of rotor (that look like ocean waves) clouds southeast of Canon City, Co that I posted on this blog. I shared them with the Pueblo Weather Service meteorologists who confirmed the photos as what are called rotor clouds that are a rare phenomena caused by "Kelvin-Helmholtz instability" that is related to wind shear likely from strong winds near mountains. Well yesterday near dusk I caught this shorter segment of rotor clouds very near to the same location as those I took two years ago--both southeast of Canon City in Fremont County, both just east of the Wet Mountains and both during a period of high winds. I think I may have spotted these at the end of their run as they lasted about a minute (per time stamp on photos I took) before losing their shape. SeEtta