Finally! A distant thunderstorm almost worthy of photography. Man, Tucson monsoons have been pretty lame this year!
Location: Mount Lemmon, Steward Observatory 60" Telescope (9,170 feet)
Camera: Canon EOS 5DMII
Lens: Canon 24-70 F/2.8L @ 35mm F/11
Exposure: Composite of 11 images with exposures between 20 and 60 seconds.