At which altitude would you expect to observe the formation of cirrostratus clouds?

Cirrostratus clouds are a type of high-altitude cloud that forms at elevations typically above 6000 meters. These clouds are characterized by their thin, veil-like appearance and are composed primarily of ice crystals. The formation of cirrostratus clouds is often associated with weather systems that are moving in, particularly as they precede warm fronts. At altitudes above 6000 meters, temperature conditions are conducive to the formation of these ice-crystal clouds rather than the lower cloud types that form at altitudes below this level.

The correct answer reflects the necessary conditions for cirrostratus clouds to form, aligning with their classification as high-level clouds. Understanding the altitude at which these clouds exist is essential for interpreting weather patterns and predicting atmospheric conditions.