What conditions generate lenticular and banner clouds?

Question

What conditions generate lenticular and banner clouds?

Answer 1

Lenticular clouds develop as a result of a standing wave pattern created when stable air moves atop a mountain...  

It signifies turbulence as the wave can bounce around smaller planes.  The clouds usually develop just off the peak on the leeward side of a moutain range..  found in places like west of Denver/Colorado Springs.

The reason a cloud is formed at the wave's crests is because of the vertical motion created by the wave pushing stable airmasses upward which causes them to condense.

As for a banner cloud, I found a nice explanation at the site listed below.