Lenticular clouds tend to form over the summit of high peaks. They are shaped like a biconvex lens, or an upside-down saucer.

It’s common to see them slowly emerging in the morning, then growing into storms by the afternoon.

The photos above of 12,280-foot Mt. Adams provide a good example.

Early morning light on Mt. Adams with a small lenticular cloud forming on top

Several hours later and the lenticular cloud is growing

Another hour and the clouds are higher and extend more than the width of the mountain

Mid-afternoon and the lenticular cloud covers the summit of Mt. Adams