Cs compared with Ci
(Section 2.3.3.6.1)Cirrostratus is distinguished from Cirrus by:
- Being in the form of a veil, usually of great horizontal extent; when seen in patches it is usually forming or dissipating
- Having no distinct details such as filaments and undulations when of the species nebulosus
- Always being thin enough to show the disc of the Sun or Moon
- Displaying numerous halo types, and when of the circular form, the haloes are usually complete circles
- Possible corona
- No mamma