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If you're unsure which code figure to report use one of our pictorial
guides which show the priority of coding.
Low level types (guide)
CL1 Small cumulus
CL2 Cumulus of moderate or strong vertical
development
CL3 Cumulonimbus without anvil
CL4 Stratocumulus from spreading out of
cumulus
CL5 Stratocumulus not from the spreading
out of cumulus
CL6 Stratus
CL7 Stratus fractus and cumulus fractus
of bad weather (pannus)
CL8 Cumulus and stratocumulus at different
heights
CL9 Cumulonimbus with anvil
Medium level types (guide)
CM1 Thin altostratus
CM2 Thick altostratus or nimbostratus
CM3 Semitransparent altocumulus
CM4 Altocumulus continually changing shape
(Lenticular altocumulus)
CM5 Altocumulus progressively invading
the sky
CM6 Altocumulus from the spreading out
of cumulus
CM7 Altocumulus with altostratus or nimbostratus
(other than chaotic sky)
CM7 Thick altocumulus in a single layer
CM7 Altocumulus at two or more levels
or thick altocumulus in a single layer
CM8 Altocumulus with tufts or sproutings
CM9 Altocumulus of a chaotic sky
High level types (guide)
CH1 Cirrus in filaments or hooks not
progressively invading the sky
CH2 Dense cirrus
CH3 Dense cirrus from cumulonimbus
CH4 Cirrus progressively invading the
sky
CH5 Cirrostratus increasing but below
45 degree elevation
CH6 Cirrostratus increasing and above
45° elevation
CH7 Cirrostratus covering the whole sky
CH8 Cirrostratus not progressively invading
the sky and not entirely covering the sky
CH9 Cirrocumulus
Other clouds and phenomenon
Condensation trails
Corona
Crepuscular rays
Halo phenomena
Irisation
Lightning
Mamma
Nacreous (mother-of-pearl)
clouds
Noctilucent clouds
Rainbow
Smoke
Spout
Velum/Pileus
Virga
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