Which type of clouds typically form at high altitudes and are thin and wispy?

Cirrus clouds are indeed characterized by their high altitude, typically forming above 20,000 feet. They are thin, wispy formations made primarily of ice crystals due to the cold temperatures at such elevations. Their high altitude and appearance distinguish them from other cloud types.

Cumulus clouds, on the other hand, tend to be puffy and white, forming at lower altitudes and are associated with fair weather. Stratus clouds form in a uniform layer, usually at lower altitudes, creating overcast conditions. Cumulonimbus clouds are towering clouds associated with thunderstorms and severe weather, typically having a significant vertical extent and not the wispy characteristic of cirrus clouds. Therefore, the unique features of cirrus clouds focus on their high altitude and thin, delicate structure.