Cirrus clouds.
The three main altitudes of clouds are low clouds, which are typically found below 6,500 feet; middle clouds, which are usually between 6,500 and 20,000 feet; and high clouds, which are typically above 20,000 feet. These altitudes can vary depending on the specific cloud types and weather conditions.
Cirrus clouds are comprised of ice crystals so they are found at high altitudes.
just high altitudes
The cirrus clouds, cirrocumulus clouds, cirrostratus clouds, and cumulonimbus clouds.
Cirrus
alto
yes
no
Lacy clouds that form at high altitudes are cirrus clouds. These types of clouds usually form before there is a change in weather. These clouds form above 20,000 feet, and they indicate fair weather.
Cumulus Clouds
All clouds are not formed at the same altitude. Clouds are formed at different altitudes ranging from 2,000m - 8,000m.