Smooth clouds like this are my favorite because they look like lozenges or flying saucers. Sometimes they’re in compound shapes like this “hat” on Mt. Hood.
Lenticular clouds are most common near mountains because the wind hits the mountain, creates an updraft and becomes a large standing wave. When moisture condenses at the top of the wave, a stationary lenticular cloud forms there. The long lozenge shapes are usually perpendicular to the wind. They sure don’t look that way!
When the wind hits the mountain the waves look like this.
Notice the stationary clouds at crests A and B. The wind follows the shape of the mountain — twice! The updraft on the windward side of the mountain is provides uplift for glider pilots but the downdrafts can be deadly. There’s a lot of turbulence in those standing waves. Powered aircraft avoid them.
Pittsburgh rarely has lenticular clouds, though a front creates one occasionally.
For really cool clouds you have to visit the mountains.
(photo of cloud by Yapin Wu via Wikimedia Commons. Diagram of wave lift by Dake on Wikimedia Commons. Click the captions to see the originals.)