Refer to figure.
For cloud classification, the troposphere is segmented into three levels: low, medium, and high. These levels correspond to three primary classifications based on cloud base. Medium-level clouds are prefixed with "alto," high-level clouds with "cirro," and low-level clouds have no prefix.
LOW LEVEL CLOUDS | BASES 0 ft – 6500 ft Water droplets |
Stratus (St) Stratocumulus (Sc) Cumulus (Cu) Cumulonimbus (Cb) Nimbostratus (Ns) – may also be classified as medium level. Cumulus and cumulonimbus will, however, have significant vertical development and will extend from LOW to HIGH levels. CB could extend into lower stratosphere. |
MEDIUM LEVEL CLOUDS | BASES 6500 ft – 23 000 ft | Altostratus (As) Altocumulus (Ac) Nimbostratus (Ns) Characterised by prefix “Alto”. |
HIGH CLOUDS | BASES 16 500 ft – 45 000 ft Ice crystals |
Cirrostratus (Cs) Cirrocumulus (Cc) Cirrus (Ci) Characterised by prefix “Cirro”. |
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