Medium-level clouds: base 2000 to 5000m
 
1 Altocumulus 2 Altocumulus 3 Altostratus Undulatus 4 Altocumulus
5 Altostratus 6 Altocumulus Lenticularis 7 Altostratus 8 Altostratus
9 Altocumulus 10 Altocumulus 11 Nimbostratus 12 Altostratus

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