An almond or lens-shaped cloud which appears to be stationarily is referred to as Lenticular Clouds.
What are these Lenticular clouds?
Almond- or lens-shaped clouds known as lenticular clouds are typically found on the leeward side of a mountain range. Despite appearing immobile, lenticular clouds may contain winds of 50 knots or more.
When the air is steady and winds are blowing across hills and mountains from the same or a comparable direction at different heights across the troposphere, these lens-shaped orographic wave clouds emerge.
How do Lenticular clouds form?
In certain situations, air blowing across a mountain range can create a train of enormous standing waves in the air downstream, similar to how ripples occur in a river when water runs over an obstruction.
If there is enough moisture in the air, the wave's upward motion will cause water vapour to condense, giving lenticular clouds their distinctive shape.
Hence, the correct answer is Lenticular clouds.
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