All cloud types
“Flying saucer sprites over mountain ranges”
Formation
Air flowing over mountains creates standing waves
Weather signal
Turbulent winds near mountains
Technical specs
Altitude6,500-40,000 ft
AppearanceLens or saucer-shaped, smooth
Fun factGlider pilots love them for the 'wave lift' they provide.
rare
Etymology
Latin: 'lenticularis' (lens-shaped)