Sunset with orange wavy clouds

Almost winter, but the clouds turned warm.
They usually occur at an altitude of 5 kilometres (16,000 ft) to 12 kilometres (39,000 ft). Like lower altitude cumuliform and stratocumuliform clouds, cirrocumulus signifies convection.

Перисто-кучевые облака (лат. Cirrocumulus, Cc) — тонкие облака, состоящие из мелких волн, хлопьев или ряби.