When a mountain casts its shadow upon the sky

During the autumn and winter months, Mount Rainier, a stratovolcano near Tacoma, Washington, blocks the first rays of the Sun as it rises. The effect is what you see here: An expanding shadow cast against clouds tinged in hues of orange and yellow.

The photograph was taken on December 31, 2012 by Redditor PCloadletter26.

H/t Twisted Swifter.