Lenticular Cloud

This morning was a strange mix of weather, but produced this lenticular cloud over one or the other of our mountains. (The one you're looking at is Norumbega, but I'd bet this partiular cloud is over Cadillac Mountain, since it's the highest.)

From crystalinks.com:
Lenticular clouds, technically known as altocumulus standing lenticularis, are stationary lens-shaped clouds that form at high altitudes, normally aligned at right-angles to the wind direction. Where stable moist air flows over a mountain or a range of mountains, a series of large-scale standing waves may form on the downwind side. Lenticular clouds sometimes form at the crests of these waves. Under certain conditions, long strings of lenticular clouds can form, creating a formation known as a wave cloud.

Check this out this awesome lenticular cloud: http://www.space.com/imageoftheday/image_of_day_031126.html