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. Halo effect around sun is often observed. 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.4 {- U" S6 i0 q) d3 e 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.2 B0 W% B5 J$ v" W/ l4 f$ } Often dark | Moderate rime ice, clear ice probable | Continuous rain or snow |
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