What is the definition of Alto Cumulus Castellatus?

Alto cumulus castellatus is a fancy meteorological term that describes a cumulus cloud that resembles a medieval castle floating high in the sky, complete with stone turrets and battlements. It's like nature's own whimsical fantasy, where the clouds have decided to take up residence on the crown of the world's highest mountain.

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Here's an edgy example sentence using it: "The climber's high atop Mount Everest stared out at the world, only to find a towering alto cumulus castellatus blocking his view of the stars, thinking he was looking at a medieval siege engine instead."