APOD 2.4

This cap cloud, as they are called, appeared in Grenada, Spain last January. It may not be an astronomical phenomena but it is one that does have importance. They are formed by air forced upwards by mountain peaks, with the air then cooling, saturating with moisture, and finally having its molecular water condense into cloud droplets. I chose this photo because when I visited Washington state a few years ago, I saw such a cloud formation. It was not to this size and magnitude, but it was still amusing to look at.