FAA Ground School Practice Test

An almond or lens-shaped cloud that appears stationary but can have winds of 50 knots or more is called what?

1. A stratocumulus cloud

2. A lenticular cloud

3. A cirrus cloud

4. A cumulus cloud

The correct answer is: A lenticular cloud

A lenticular cloud is characterized by its almond or lens shape and is typically formed when moist air flows over a mountain range or geographical obstacle. As the air rises, it cools and condenses, creating these stationary-looking clouds. Despite their appearance of being still, lenticular clouds are associated with strong winds, which can often exceed 50 knots. The unique formation and stability of these clouds, combined with their association with high winds, are significant for pilots and meteorologists to understand, as they can indicate turbulent air conditions and changes in wind patterns. Stratocumulus clouds are more widespread, low-level clouds that appear in patches and usually do not have the same wind characteristics. Cirrus clouds are high-altitude clouds that are thin and wispy, lacking the lens shape and turbulence associated with lenticular clouds. Cumulus clouds are puffy, usually found at lower altitudes, and typically indicate fair weather, making them different from lenticular clouds in structure and behavior.