Thermo-Clouds

Entered descending by height

Cirrus

Ci Clouds, thin, high level

Cirrocumulus

Cc, has ripples, high level

Cirrostratus

Cs, opaqueness (sun halo), high level

Altocumulus

Ac, partly cloudy and semi-rippled, mid-level (troposphere)

Altostratus

As, very cloudy but sun still visible, mid-level

Stratocumulus

Sc, rippled cloudy, low-level

Stratus

St, cloudy but drizzling

Nimbostratus

Ns, no sun and raining (England), deep clouds

Cumulus

Cu, puffy and dense, deep clouds

Cumulonimbus

Cb, deep convection, deep clouds

Congestus

Cu, Cumulus but puffier (more convection in dry locations)

Humulis

Cu, sign of convection before Cumulonimbus forms