Clouds Formation

- Genus Cirrus (Ci): Fibrous wisps of delicate white ice crystal cloud that show up clearly against the blue sky.
Cirrus clouds are generally non-convective except castellanus and floccus species. They often form along a high altitude jetstream and at the very leading edge of a frontal or low pressure disturbance where they may merge into cirrostratus.
+ Species Cirrus fibratus (Ci fib): Fibrous cirrus with no tufts or hooks.
+ Species Cirrus uncinus (Ci unc): Hooked cirrus filaments.