Kilauea volcano on Hawaii, lava from volcano that has been erupting since 1983. A lava flow taking over a highway and burning the asphalt. This lave is so hot it melts and burns the asphalt, creating thick clouds of black smoke.
Puyehue-Cordon Caulle Volcano Eruption in Chile (the picture of a lightning filled cloud, usually labeled, Rome, GA, 2012, is NOT a tornado, but another view of this eruption. Volcanic clouds often produce lightning.)
Rainbow. I think this phenomenon is called sky fire or fire rainbows? I saw one in the sky over Chicago (April 2013). It lasted about 40 minutes and was truly awe inspiring. It changed color and intensity slowly and at times was only partially visible behind a veil of bright cumulus clouds. I was driving to work at the time so was unable to take pictures.