"Moon cloud" is not a recognized meteorological term. There's no official definition or scientific explanation for this phrase. It's possible that it's a colloquial term used to describe a specific phenomenon, or it might be a misinterpretation of a different weather event.
Here are some possible interpretations:
- A cloud that appears near the moon: This is the most likely interpretation. Clouds can appear to be near the moon, especially when they are low in the sky. This is just a visual effect and doesn't represent a unique cloud type.
- A cloud that casts a shadow on the moon: This is also possible, although it's rare. Thick, dense clouds can occasionally cast a shadow on the moon, but this is usually a temporary phenomenon.
- A cloud that has a moon-like shape: This could be a descriptive term for a cloud with a rounded or crescent-shaped appearance.
Without further context or specific observations, it's difficult to determine the exact meaning of "moon cloud."