Cirrostratus clouds are categorized at what altitude level?

Cirrostratus clouds are classified as high-level clouds that typically form at altitudes above 6,000 meters. These clouds are composed primarily of ice crystals due to the cold temperatures found at higher altitudes. The presence of cirrostratus clouds is often associated with a thin, transparent veil that can produce a halo effect around the sun or moon, a phenomenon that can be visually striking and is a key characteristic of this cloud type.

In distinguishing cirrostratus clouds from other types, it's important to understand that lower-altitude clouds, like stratus or cumulus, are significantly less than 6,000 meters and do not exhibit the same icy composition or atmospheric conditions. Therefore, recognizing that cirrostratus clouds belong to the category of high-altitude clouds at 6,000 meters and above helps to solidify one's understanding of cloud classifications in meteorology.