CLOUD CHARACTERISTICS

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CLOUD CHARACTERISTICS

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. ' U, f: g R2 b1 R5 s/ pComposed 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. 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. Often dark	Moderate rime ice, clear ice probable	Continuous rain or snow