- Pileus cloud cap which is stationary in its vertical position
- W993249S
- Pileus cloud sequence, 4 of 4. The original Pileus continues to cover a large part of the view as air moves up the gentle slope of the crown. The new, higher Pileus has now thickened, but it still shows upward dents where the boiling from below pushes into it. The tower is starting to catch up to the cap, which is stationary in its vertical position.
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