¥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)