If you mean above 20,000 feet, it's probably a cirrus cloud.
Cirrus clouds
cirrus
Those are cirrus clouds.
cirrus
A curled cloud is actually called a cirrus cloud. These clouds are made of ice crystals that can be seen high in the sky that are tiny and wispy.
Cirrus clouds
Cirrus clouds
Wispy, high cloud formations
Cirrus
cirrus
cirrus
Those are cirrus clouds.
cirrus
The cloud prefix that means "high" is "cirro-." Clouds that have this prefix are located high in the sky and are usually wispy in appearance.
A curled cloud is actually called a cirrus cloud. These clouds are made of ice crystals that can be seen high in the sky that are tiny and wispy.
A wispy cloud is very fragile, very slight. If even a small breeze touched a wispy cloud, the cloud would disappear.
An altocirrus cloud is a wispy cloud that sits relly high in the sky. You will see more pictures of altocirrus clouds thn you do info. :P