Which type of clouds are found at upper levels of the atmosphere?

Cirrus clouds are found at upper levels of the atmosphere, typically at altitudes above 20,000 feet. They are thin and wispy in appearance, composed mainly of ice crystals due to the cold temperatures at such elevations. These clouds often indicate fair weather but can also signal the approach of a weather system.

In contrast, other cloud types such as cumulus and stratus clouds are generally found at lower altitudes. Cumulonimbus clouds, known for their towering nature and association with thunderstorms, also form at lower to intermediate levels in the atmosphere. Recognizing the characteristics and altitudinal placements of these clouds provides insight into weather patterns and forecasts, making the identification of cirrus clouds as high-altitude formations essential for understanding atmospheric conditions.