The Sierra Wave (aka Lee Waves) Huge Lenticular Cloud Formation
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(The lee side is the side that is downstream from the wind.) The first
wave occurs above the mountain that causes it, with a series of waves of
equal horizontal wavelength extending downstream. Numerous equally
spaced lee waves are often seen where they are not interfered with by
other mountains, such as over the sea. They may produce clouds, called wave clouds, when the air becomes saturated with water vapour at the top of the wave.
The
spacing between the waves is usually around 2 to 8 km (1 to 5 miles).
If this spacing coincides approximately with the spacing of the hills,
the waves become large; if not, the lee waves of one mountain may be
annulled as the air passes over a second. In hilly country with a
complicated topography,
intense waves may be temporarily set up in one or two places. Strong
winds may occur under and upstream of the first lee wave troughs,
causing windstorms.
Borrowed info from Britannaica
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