Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as?

The stationary, lens-shaped clouds that mark the crests of standing mountain waves are known as standing lenticular clouds. These clouds form in regions where the air flow encounters a mountain or range of mountains, causing it to rise and create wave patterns in the atmosphere.

As the air rises and cools, it can reach its dew point, leading to the condensation of moisture and the formation of these distinctive clouds. Standing lenticular clouds are characterized by their smooth, lens-like shapes and their resemblance to a stack of pancakes, often appearing to hover over the mountain peaks.

Mammatocumulus clouds, roll clouds, and stratocumulus clouds do not have this specific formation mechanism linked with standing mountain waves. Mammatocumulus clouds generally appear as pouch-like structures protruding from a cumulus cloud and are associated with severe weather. Roll clouds are horizontal, tube-like clouds that typically form ahead of a cold front and are not stationary. Stratocumulus clouds are low, lumpy clouds that can cover the sky but do not have the distinct lenticular shape associated with mountain waves. Thus, identifying these specific clouds as standing lenticular clouds underscores their unique formation and significance in meteorology related to mountainous terrain.