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Cloud classification
Stratus cloud Stratocumulus cloud Cumulus cloud Nimbostratus cloud Cumulonimbus cloud Altostratus cloud Altocumulus cloud Cirrus cloud Cirrostratus cloud Cirrocumulus cloud

Stratus cloud	Stratocumulus cloud
Name: Stratus (St) Height range: ground level to 6,500 feet Composition: water droplets Turbulence: nil Icing: occasionally light to moderate Visibility: moderate to poor (10 to 30 metres) Significance: warm sector, risen fog, light precipitation	Name: Stratocumulus (Sc) Height range: ground level to 6,500 feet Composition: water droplets Turbulence: light to moderate Icing: light to moderate Visibility: moderate to poor (10 to 30 metres) Significance: turbulence cloud, often associated with cumulus cloud

Cumulus cloud	Nimbostratus cloud
Name: Cumulus (Cu) Height range: ground level to 25,000 feet Composition: water droplets and ice crystals Turbulence: moderate to severe Icing: moderate to severe Visibility: poor (less than 20 metres, occasionally less than 10 metres) Significance: instability cloud, cold front; large cumulus may develop into cumulonimbus	Name: Nimbostratus (Ns) Height range: ground level to 15,000 feet Composition: mainly water droplets, but ice crystals at medium levels Turbulence: moderate to severe Icing: moderate to severe Visibility: poor (10 to 20 metres) Significance: warm front adjacent

Cumulonimbus cloud	Altostratus cloud
Name: Cumulonimbus (Cb) Height range: ground level to 45,000 feet Composition: water droplets and ice crystals Turbulence: moderate to severe, occasionally very severe Icing: moderate to severe Visibility: poor (less than 20 metres, occasionally less than 10 metres) Significance: instability cloud, thunderstorms, lightning, hail	Name: Altostratus (As) Height range: 6,500 to 23,000 feet Composition: water droplets and ice crystals Turbulence: light to moderate Icing: light to moderate Visibility: fair (20 to 1,000 metres) Significance: 200 nautical miles ahead of a warm front, often merges into nimbostratus behind and below

Altocumulus cloud	Cirrus cloud
Name: Altocumulus (Ac) Height range: 6,500 to 23,000 feet Composition: water droplets and ice crystals Turbulence: light to moderate Icing: light to moderate Visibility: fair (20 to 1,000 metres) Significance: sometimes indicates the approach of a warm front	Name: Cirrus (Ci) Height range: 16,000 to 45,000 feet Composition: ice crystals Turbulence: nil Icing: nil Visibility: quite good (1,000 metres and more) Significance: 400 to 600 nautical miles ahead of a warm front

Cirrostratus cloud	Cirrocumulus cloud
Name: Cirrostratus (Cs) Height range: 16,000 to 45,000 feet Composition: ice crystals Turbulence: nil Icing: nil Visibility: quite good (1,000 metres and more) Significance: 300 to 500 nautical miles ahead of a warm front	Name: Cirrocumulus (Cc) Height range: 16,000 to 45,000 feet Composition: ice crystals Turbulence: nil Icing: nil Visibility: quite good (1,000 metres and more) Significance: 300 to 500 nautical miles ahead of a warm front

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