What is Cirrus cloud?

Answer 1

A cirrostratus cloud is a high, thin, generally uniform stratiform type composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus.

Answer 2

Cirrus clouds are very thin and wispy clouds that don't produce rain. It was named after the Latin word for curly hair.

Answer 3

They look like fish scales. They can indicate unsettled weather. Often called a mackerel sky