They are usually high....
water
They are Cirrostratus an Cirrus.
2 feet
several thousand feet deep
A cirrostratus cloud is a high, thin, stratiform made of ice crystals.You can find more information about cirrostratus clouds online or in books at your local library.
Cirrostratus clouds.
Cirrostratus
12-24 hours before a rain or snow storm
when cold air and warm air fall into each others place
A high-level cloud type.
Cirrostratus Altostratus Stratocumulus Cumulonimbus Cirrocumulus Altocumulus Nimbostratus Stratocumulus Cumulonimbus
A low level cloud is a cloud that forms below 6,500 feet (2,000 meters) in the atmosphere. These clouds are typically composed of water droplets and are often associated with precipitation. Examples of low level clouds include stratus clouds, cumulus clouds, and stratocumulus clouds.