A lenticular cloud forming over the peak of a mountain.
Lenticular clouds are stationary or slow moving clouds and known also as altocumulus standing lenticularis. As they form in high pressure areas they become lens-shaped. They normally form perpendicular to the direction in which the wind travels, often the wind is at a high speed. Caused by moist air rising over a mountain and wave-like movements in the atmosphere, they are frequently associated with hills and mountains. For hours or even days the clouds appear to hover until the wind or weather changes.
Lenticulars are often saucer shaped.
Bibliography:
1. http://www.crystalinks.com/lenticular.html, (accessed Oct.20, 2009)
2. http://www.thelivingmoon.com/43ancients/02files/Cloud_Images_Lenticular_01.html, (accessed Oct. 20, 2009)
3. http://virtualskies.arc.nasa.gov/weather/tutorial/lenticular.html, (accessed Oct. 20,2009)
4.http://www.wisegeek.com/what-are-lenticular-clouds.htm, (accessed Oct. 20,2009)
