Learn About the 10 Different Types of Clouds Level : High. Cirrus (Ci) High, wispy streaks. Cirrocumulus (Cc) High-altitude cloudlets. ... Level : Middle. Altocumulus (Ac) Mid-altitude cloud heaps. Altostratus (As) Mid-altitude gray layer. ... Level: Low. Cumulonimbus (Cb) Thunderstorms. Cumulus (Cu) Low, puffy, fair-weather.