St compared with Ci

(Section 2.3.8.6.1)

Stratus can occasionally resemble Cirrus when it is frayed by the wind into the form of coarse fibres (Stratus fractus). The fibres:

• Are not as white (except when viewed towards the Sun) as Cirrus fibres
• Are not as spread out as Cirrus fibres
• Change in appearance rapidly (Cirrus is noted for slow changes)