* Cirrus (Ci)

* Cirrostratus (Cs)

* Cirrocumulus (Cc)

* Middle clouds

* Altocumulus (Ac)

* Stratocumulus (Sc)

* Low clouds

* Stratus (St)

* Nimbostratus (Ns)

* Clouds with significant vertical development

* Cumulus (Cu)

* Cumulonimbus (Cb)