Mysterious Cloud Circle Appears In The Yakima Sky [PHOTOS]

For lunch Todd & I had pizza and I noticed this unusual circular cloud out of the window. At first I though it was a fighter jet that had traveled in a circle but it seems the g-forces generated from creating a circle that tight would be prohibitive. Then I thought it was someone blowing smoke from a giant cigarette. Perhaps the cover to the next Led Zeppelin Box Set (if there can be crop circles why not air circles?).

Who made this cloud circle? Aliens perhaps? We may never know.

UPDATE: Some of Todd's friends have sent us even more photos from other angles.