Definition
Cirrostratus clouds are thin, sheet-like high-altitude clouds composed of ice crystals. They often cover the entire sky and can create a halo effect around the sun or moon. Cirrostratus clouds are nearly transparent and can be difficult to detect. Think of them as a high-altitude veil of ice. They are usually associated with approaching warm fronts and can indicate that precipitation is on the way. These clouds are more subtle than other types, but they hold significant information about the weather.