High clouds (Family A)
High clouds will form between 10,000 and 25,000 ft (3,000 and 8,000 m) in the polar regions, 16,500 and 40,000 ft (5,000 and 12,000 m) in the temperate regions and 20,000 and 60,000 ft (6,000 and 18,000 m) in the tropical region.[1]
Cirrocumulus (Cc)
Cirrus (Ci)
Cirrostratus (Cs)
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[edit] Middle clouds (Family B)
Middle clouds tend to form at 6,500 ft (2,000 m) but may form at heights up to 13,000 ft (4,000 m), 23,000 ft (7,000 m) or 25,000 ft (8,000 m) depending on the region. Nimbostratus clouds are sometimes included with the middle clouds.[1]
Altostratus (As)
Altocumulus (Ac)
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[edit] Low clouds (Family C)
Stratocumulus clouds, between Cumulus in the foreground and backgroundThese are found up to 6,500 ft (2,000 m)[1] and include the stratus (dense and grey). When stratus clouds contact the ground, they are called fog.
Clouds in Family C include:
Cumulus[2] (Cu)
Cumulus humilis
Cumulus mediocris
Stratocumulus (Sc)
Nimbostratus (Ns)
Stratus (St)
High clouds will form between 10,000 and 25,000 ft (3,000 and 8,000 m) in the polar regions, 16,500 and 40,000 ft (5,000 and 12,000 m) in the temperate regions and 20,000 and 60,000 ft (6,000 and 18,000 m) in the tropical region.[1]
Cirrocumulus (Cc)
Cirrus (Ci)
Cirrostratus (Cs)
--------------------------------------------------
[edit] Middle clouds (Family B)
Middle clouds tend to form at 6,500 ft (2,000 m) but may form at heights up to 13,000 ft (4,000 m), 23,000 ft (7,000 m) or 25,000 ft (8,000 m) depending on the region. Nimbostratus clouds are sometimes included with the middle clouds.[1]
Altostratus (As)
Altocumulus (Ac)
---------------------------------------------
[edit] Low clouds (Family C)
Stratocumulus clouds, between Cumulus in the foreground and backgroundThese are found up to 6,500 ft (2,000 m)[1] and include the stratus (dense and grey). When stratus clouds contact the ground, they are called fog.
Clouds in Family C include:
Cumulus[2] (Cu)
Cumulus humilis
Cumulus mediocris
Stratocumulus (Sc)
Nimbostratus (Ns)
Stratus (St)
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