The Only Known Photograph of a "Rainbow" P-G Cloud ... WOW!

1. Via and caption: http://www.flickr.com/photos/madebackwards/1579046 ... (www.flickr.com/photos/madebackwards/1579046348/)

2. More details from the photographer: http://www.flickr.com/photos/madebackwards/1579046 ... (www.flickr.com/photos/madebackwards/1579046348/comment72157605589033863/)

3. Prandtl-Glauert (P-G) Cloud Q&A: http://digg.com/general_sciences/Chillin_2?t=19208 ... (digg.com/general_sciences/Chillin_2?t=19208568#c19208568)