Middle Clouds - Altocumulus (Ac)

Middle clouds are composed of water and/or ice

Cloud-base heights for middle clouds:

Tropical Region Middle Latitudes Polar Regions
2-8 km 2-7 km 2-4 km
  • Altocumulus Clouds - shallow, puffy or wave-like in appearance
  • appear the size of your thumbnail when holding your arm up to the sky