| CLOUD TYPE | DESCRIPTION | ICING | PRECIPITATION | 
|     Cirrus (high) Ci | White tufts or filaments composed of ice crystals indicating upper level jet streams, wind shear and turbulence |       Nil |       Nil | 
|     Cirrocumulus (high) Cc | Small puffy or rippled elements composed of ice crystals width less than 1o (1 finger) |     Usually nil |     Nil | 
|       Cirrostratus (high) Cs | Nearly transparent sheet or veil like cloud covering.
# P. m5 f0 T; v6 d, l9 k0 C+ B' aHalo effect around sun is often observed.* J$ M# K% r2 s" M
Composed of ice crystals |       Usually nil |       Nil | 
| Altocumulus (middle) Ac | White to gray, rippled elements 1-5 (3 fingers) | Light rime possible and light turbulence | Light showers of rain possible if castellanus | 
|   Altostratus (middle) As | Grey sheet or layer.; P" B8 U0 q$ w# u- ?" A. ?' z3 o, L
Sun appears through ground glass | Moderate Rime possible and light turbulence | Light to moderate rain or snow | 
|     Cumulus (low) Cu | Small to large cauliflower shaped cloud, flat base needs unstable or conditionally instable atmosphere |   Clear ice in towering Cu (TCU) above freezing level |     Showers of Rain or Snow | 
| Stratocumulus (low) Sc | White to gray layered cloud | Occasional Rime ice | Drizzle | 
| Stratus (low) St | Thin grayish sheet or layer associated with bad weather |   Usually nil |   Drizzle | 
| Cumulonimbus (low and middle) Cb | Towering cauliflower shape, anvil top, lightning, thunder |     Sever clear ice |   Heavy showers of rain, hail or snow | 
| Nimbostratus (middle) Ns | Thick gray cloud layer.0 N$ h4 l/ \: x
Often dark | Moderate rime ice, clear ice probable | Continuous rain or snow |