Cirrus Clouds

Cirrus Clouds (“Delicate cloud streaks”) 
Cirrus clouds are the highest of all clouds and are composed entirely of ice crystals.
Cirrus clouds are precipitating clouds, although the ice crystals evaporate high above the earth’s surface.
The crystals, caught in 100-150 mph winds create wisps of cloud. 

Fast Facts:
Typical Altitude:  16,500-45,000 ft.
Location:  Worldwide
Precipitation:  None that reaches ground
Composition:  Ice crystals
Formation:  Fall streaks of ice crystals in upper troposphere winds 

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