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A Pileus or "cap cloud" crowns the top of a rapidly developing cumulus congestus cloud which will soon become a monsoonal thunderstorm over the mountains of Arizona. Such clouds form when a relatively stable, but moist, layer is breached by a strong convective updraft.
A Pileus or "cap cloud" crowns the top of a rapidly developing cumulus congestus cloud which will soon become a monsoonal thunderstorm over the mountains of Arizona. Such clouds form when a relatively stable, but moist, layer is breached by a strong convective updraft.
Filename: wsi-cld022.tif
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