Cirrus uncinus is a species of cirrus cloud. The name cirrus uncinus is Latin for "curly hooks". Commonly called "mare's tail", this cloud species is very thin and generally sparse in the sky.[1]
The clouds occur at high altitudes, at a temperature of about −50 to −40°C (−58 to −40°F). They are generally seen when a warm or occluded front is approaching. They are very high in the troposphere and generally mean that precipitation, usually rain, is approaching.[2]
