What’s interesting about this image is that it was close to midnight and the sun was setting. Since we were at the southern tip of South America during December, there were only a couple of hours of darkness each day. Unless you live in or regularly visit the mountains, you’ve probably never seen a lenticular cloud because they form when stable moist air flows over large obstructions (most often mountains) and the temperature at the top drops to the dew point. Over the years, these clouds have often been mistaken for UFOs, particularly ones that are more flat than round which give them the appearance of flying-saucers. I just think they’re awesome to look at.