Around 9:45 PM on December 19, 2013 I got a text from a friend who suggested I look to the east at an illuminated cloud. This is the second shot I got of the cloud, actually it's four shots that I stitched into a pano. There were no other clouds in the sky, just this one hanging over the Sierra east of Oroville. The cloud was still in the same place when I went to bed around midnight. At 6:45 AM the cloud was still there (see below). It appears this was a standing wave cloud that "stood" all night, at least nine hours.