Neat rotor/wave clouds over Wet Mountains
I photographed clouds similar to these in 2010 then again in 2012. I shared them with the Pueblo Weather Service meteorologists who confirmed the photos 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.
I spotted these yesterday as strong winds caused the wind shear along the Wet Mountains just to the southwest of Canon City to create these rotor/wave clouds again. SeEtta