An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as?

The correct choice refers to a lenticular cloud, which is characterized by its almond or lens shape and often appears stationary. These clouds form as moist air flows over a mountain or a raised terrain. As the air rises, it cools and condenses, creating the distinctive shape. Lenticular clouds can indicate the presence of significant winds, sometimes exceeding 50 knots, in the atmosphere around them, which can be a hazard for pilots flying nearby.

The unique formation process of lenticular clouds is tied directly to their stationary appearance; they often remain fixed in one place while the air continues to flow through and around them. This behavior is a crucial aspect to recognize for pilots, as the strong winds associated with these clouds can lead to turbulence and challenges during flight. Understanding the characteristics of lenticular clouds is essential for safe flying in mountainous regions or areas with complex terrain.