Supercooled clouds

From Glossary of Meteorology
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supercooled cloud

A cloud composed of supercooled liquid water drops.

The importance of such clouds lies in their unstable composition, since natural or artificial addition of ice crystals or other ice nuclei will initiate the rapid phase change to a mixed cloud or to an ice crystal cloud as described by the Bergeron–Findeisen theory. This type of cloud constitutes the principal source of aircraft icing.