2. Classified by height above
ground and shape
High clouds-Bases above
20,000 feet
Middle Clouds-occupy
heights from 6,500-20,000
feet
Low Clouds-form below
6,500 feet
3. Bases above 20,000
feet
Prefix cirro is used to
name
Cirrus
Cirrostratus
Cirrocumulus
4. Thin and Wispy
Feathery Appearance
Have a net heating effect
Could be sign of
approaching frontal
system
Maybe remnants of a
thunderstorm
5. Classified as a high cloud
Thin, Ice crystal clouds
Often form halos around
moon or sun
Can be signs of a warm
front
Can signal precipitation
6. Classified as a high cloud
Composed of ice crystals
Usually in ripples or
waves as in the picture
Very uncommon
Usually turn into
cirrostratus clouds