Rainbow Sunset in the Nevada Desert.
Canon 5D3, 16 mm F2.8 at F16, ISO 100, 1/15 sec. Manfrotto Tripoc and Head.
This appears to be the Rainbow Glow of the Las Vegas lights at sunset to the West many miles away out in the Remote Nevada Desert. There had also been two days of High Wind Advisories (4/15/15). I could also see this Rainbow glow later when taking night and star images.
I hope you enjoy. HarryFordAZ