¥Other cloud types
¥Kelvin-Helmholtz - billowed
clouds that resemble breaking waves and form in strong wind
shear
¥Nacreous - thin, sometimes
iridescent clouds in stratosphere (30 km height) (mother of
pearl)
¥Noctilucent - thin clouds
in upper mesosphere (80 km height), seen in polar twilight
(night-light)