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.) s8 u; _, b% D% x7 q
Halo effect around sun is often observed.# ]2 o$ e- [; z- b4 n
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.
9 Y2 s0 @8 x1 q0 b! `8 hSun 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.
6 T* s/ F; a, f* S+ [* c) [0 aOften dark | Moderate rime ice, clear ice probable | Continuous rain or snow |