At http://spaceweather.com … the site is updated daily and is always worth a brief snatch of your attention. Today it has a video of sprites in the sky above Oklahoma on June 23rd. One of themis 40 miles tall and 46 miles wide – hardly a sprite in the literal meaning of the word. It was bigger than Mount Everest.
Sprites have been recorded over a long period of time but scientists did not believe they existed and ignored them until after 1989 when they were photographed from the space shuttle. Basically, sprites are upward rising lightning bolts