Lenticular Clouds Above Washington

Are those UFOs near that mountain? No -- they are multilayered lenticular clouds.
Moist air forced to flow upward around mountain tops can create lenticular clouds.
Water droplets condense from moist air cooled below the dew point, and clouds are
opaque groups of water droplets. Waves in the air that would normally be seen
horizontally can then be seen vertically, by the different levels where clouds form.
On some days the city of Seattle, Washington, USA, is treated to an usual sky show
when lenticular clouds form near Mt. Rainier, a large mountain that looms just under
100 kilometers southeast of the city. This image of a spectacular cluster of lenticular
clouds was taken last December.

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