Contrails also tend to spread out and can be visible for up to an hour in cirrostratus.

A tissue of worry lies like a layer of cirrostratus between you and the moon.

Cirrostratus is usually located above 5.5 km (18,000 ft).

The other clouds in this étage are cirrus and cirrostratus.

The other two genera, cirrocumulus and cirrostratus, are also high clouds.

There were clouds across the moon: cirrostratus thickening to become altostratus.

If the cirrostratus begins as fragmented fibratus it often means the front is weak.

Cirrus radiatus is often partly made up of cirrocumulus or cirrostratus.

When they become so extensive that they are virtually indistinguishable from one another, they form a sheet of high cloud called cirrostratus.

There are three main genera in the family of high clouds: cirrus, cirrocumulus, and cirrostratus.

Cirrostratus come in two species, fibratus and nebulosus.

On the approach of a frontal system, the cirrostratus often begins as nebulosus and turns to fibratus.

Cirrostratus (Cs)

The first clouds to form along the sloping surface of the cold air are high cirrus, which thicken to cirrostratus and altostratus.

The name cirrostratus nebulosus is derived from Latin, meaning "full of vapor, foggy, cloudy, dark".

Unlike other high cirrus and cirrostratus, cirrocumulus includes a small amount of liquid water droplets, although these are in a supercooled state.

An elevated portion of a frontal zone forces broad areas of lift, which form clouds decks such as altostratus or cirrostratus.

Cirrus mixed with cirrostratus can produce halos around the sun and sundogs, which are arcs of brightness near the sun.

Cirrocumulus and cirrostratus are sometimes informally referred to as "cirriform clouds" because of their frequent association with cirrus.

Cirrocumulus is one of the three main genus-types of high-altitude tropospheric clouds, which also includes cirrus and cirrostratus.

'Cirrostratus' clouds are thin, generally uniform clouds, composed of ice-crystals, capable of forming Halo (optical phenomenon)s.

Cirrostratus at its most characteristic tends to be mostly of the stratiform species nebulosus, which creates a rather diffuse appearance lacking in structural detail.

If it is a warm front, the cirrus clouds spread out into cirrostratus, which then thicken and lower into altocumulus and altostratus.

A thickening and lowering of cirrostratus into mid-level altostratus is a good sign the warm front or low has moved closer and precipitation may begin within 24 hours.

The phrase "hazy sunshine" is often, as well as referring to haze or light mist, used to refer to the milky look of the sky when cirrostratus is present.