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Centre for Atmospheric Science

Ice and Mixed Phase Clouds - Rosettes

Rosettes are formed at temperatures below about -50C, often at quite high supersaturation (typically greater than water saturation) and are often found in frontal or aged anvil cirrus cloud. It is thought that these crystals grow from supercooled drops (or possibly haze droplets) which have undergone homogeneous freezing.

Rosettes are formed at temperatures below about -50C, often at quite high supersaturation (typically greater than water saturation) and are often found in frontal or aged anvil cirrus cloud. It is thought that these crystals grow from supercooled drops (or possibly haze droplets) which have undergone homogeneous freezing.