Cirrostratus clouds are very high up in the sky.

Cirrostratus clouds can tell you that there will be fair weather.

Cirrostratus clouds can also mean that a storm is approaching.

Altostratus clouds can develop at mid-levels.

If the altostratus clouds are not to thick sun light can filter through them.

Forms at low elevations

When air gets cool enough were it reaches it’s dew point close to the ground it creates a stratus cloud called fog.