Late on the afternoon of August 31, 2006, the sky over Southern California's Anza-Borrego Desert took on quite a colorful appearance.  In this image, a segment of a rainbow emerges as a colorful spear from the bottom of the cloud while, at the top, violent internal updrafts are tearing the cloud upward like taffy.  The majority of the cloud is being illuminated by the reddish light of the setting sun but the updraft at the top still appears white, apparently shielded from the sun's direct rays.