Lenticular cloud, Russia. Captured just at the right moment, when the sun is directly striking the bottom of the cloud and light is refracted through the top of the cloud. It gives an amazing two-tone effect.
Lenticular Clouds Wow I had no idea about spectacular cloud formations. Seriously, how do you explain them all without acknowledging God. How do you explain why this doesn't happen more often or repetitively if you're just explaining it by forces of nature. The same forces consistently exist, yet the same result (cloud formation) doesn't consistently appear. (Added comment by EggloEggs)