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

A lenticular cloud is characterized by its distinctive almond or lens shape and is often mistaken for a stationary cloud; however, it forms as air flows over topography, such as mountains. This type of cloud can indicate the presence of high winds in the upper atmosphere, which may be 50 knots or more. The stationary appearance is due to the airflow pattern around the obstacle causing the cloud to form, while turbulent winds can exist within these clouds.

In contrast, stratiform clouds are typically layered and do not exhibit the same features or turbulence as lenticular clouds. Cumulonimbus clouds are associated with severe weather, including thunderstorms, and have a towering appearance, while nimbostratus clouds are thicker, rain-bearing clouds that cover the sky uniformly. These characteristics help to distinguish lenticular clouds as the unique type described in the question.