This shot was taken after 8:00pm the other night when the sun was already below the horizon. I decided to look towards the east and noticed this varied cloud formation. My biggest regret when taking landscape photos during sunset is leaving too soon. The sun is great and all, but the real magic happens just after it is gone.
I snicker when I see other photographers leaving before the sky reaches this dramatic peak. It’s a gamble; never knowing when it’s going to occur. It can change from one minute to the next in the most unbelievable way.
There is something to be said about having patience…

From wiki: As a ray of white sunlight travels through the atmosphere to an observer, some of the colors are scattered out of the beam by air molecules and airborne particles, changing the final color of the beam the viewer sees. Because the shorter wavelength components, such as blue and green, scatter more strongly, these colors are preferentially removed from the beam.At sunrise and sunset, when the path through the atmosphere is longer, the blue and green components are removed almost completely, leaving the longer wavelength orange and red hues we see at those times. The remaining reddened sunlight can then be scattered by cloud droplets and other relatively large particles to light up the horizon red and orange.