| 1 of 2 | Cloud gallery |
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| Cumulonimbus ('anvil' forming) |
High altitude cirrus |
Cumulus (building) |
Aircraft vapour trail (still air) |
Stratus (with residual vapour trail) |
Nimbostratus (evening) |
Fog (visibility 100 m) |
Altocumulus |
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| Heavy cumulus (rain imminent) |
Precipitation (heavy rain shower) |
Moderate cumulus, altostratus and cirrus |
Cirrus (with aircraft vapour trails) |
Fair weather cumulus |
Developing cumulus |
Altostratus and stratocumulus |
Cirrocumulus |
| Aircraft Communications and Navigation Systems |