Noctilucent clouds have surprised researchers by appearing early this year. The unexpected apparition of electric-blue night-shining clouds hints at a change in the "teleconnections" of Earth's atmosphere.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2013/07jun_nlcs/
VIDEO: http://www.youtube.com/watch?v=ohQzHz9gy6c
