Clouds Formation

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.
+ Species Cirrus spissatus (Ci spi): Patchy dense cirrus.