Cirrus

Cirrus (Ci; Latin for wisp of hair) is a genus of clouds characterized by occurrence in high altitudes and by appearing to consist of fibrous or wispy strands. Cirrus clouds are composed of millions of ice crystals blown into streaks by high-level winds, and they indicate the presence of moisture high in the troposphere.

Cirrus clouds were first described in 1802 by Luke Howard as "parallel, flexuous or diverging fibres extensible by increase in any or all directions."

Subtype

 * Cirrus fibratus
 * Cirrus intortus
 * Cirrus Castellanus
 * Cirrus radiatus
 * Cirrus uncinus
 * Cirrus spissatus
 * Cirrus floccus
 * Cirrus lacunosus
 * Cirrus duplicatus
 * Cirrus vertebratus
 * Cirrus spissatus
 * Cirrus floccus
 * Cirrus lacunosus
 * Cirrus duplicatus
 * Cirrus vertebratus
 * Cirrus duplicatus
 * Cirrus vertebratus
 * Cirrus vertebratus
 * Cirrus vertebratus