CirrocumulusSmall white cloudlets often arranged in fine ripples, mostly made of ice.High clouds5–13 kmHigh clouds are mostly made of ice crystals. Cirrus forms delicate fibres, cirrocumulus makes small ripples, and cirrostratus spreads into a thin veil that can produce a halo around the Sun.Clouds of the troposphereHigh cloudsMiddle cloudsLow cloudsCoast & mountainsCirrusCirrocumulusCirrostratusAltocumulusAltostratusNimbostratusStratocumulusCumulusCumulonimbusStratusCloud classification · WMOTroposphere