Final answer:
A lenticular cloud is an almond or lens-shaped cloud that appears stationary, but can contain strong winds. These clouds are formed when moist air encounters an obstacle and is forced to rise and cool.
Step-by-step explanation:
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as a lenticular cloud. Lenticular clouds are formed when moist air encounters a barrier, such as a mountain, and is forced to rise and cool. The cooled air condenses into a cloud, taking on the shape of the obstacle it encountered.