Sunsets are, to use the Forrest Gump phrase, like a box of chocolates: you never know what you're going to get. Having observed (and photographed) now dozens of sunsets, there are times I figured it was a wash, only to see something spectacular. Other times, the sky has all the makings for a beautiful sunset, and for reasons pertaining to optics, cloud type, and the cloud's location in the sky relative to the sun, it's a bust.
Having a west-facing deck means that I am privy to sunsets every night of the week. We've watched as the sun has been increasingly creeping up the side of Smelter Mtn. as the autumnal equinox approaches.
Number Three is based on a photo taken recently of a sunset from our deck; I cropped the already zoomed image a bit more to render it to two large masses and a smaller mass. The colors on these sunset clouds are simply amazing - dark purples, blues and reds for the body of the cloud that faces away from the sun. Along the bottom edge, the longer wavelengths of the sun's visible spectrum of light pass through the cloud vapor, going first from pale yellow to a salmon/pink, to finally intense crimsons and oranges. Finally, these fade to increasingly darker shades of purple.
Further to the west and thus lower on the horizon, distal clouds await their turn to transition to brilliant colors.