Imminent Stormageddon. I've seen hundreds of these storm formations before. They say that it means there will be a tornado soon. But sometimes the warm air from below and the cold air from above doesn't quiet work together, and it just gives you this spectacular effect.
June 5, 2011 | a volcano in the Puyehue-Cordon Caulle chain of south-central Chile erupted after lying dormant for more than 50 years. The government evacuated several thousand residents as Puyehue threw ash more than 6 miles into the sky, pushing the plume toward neighboring Argentina. Authorities had already put the area around the volcano on alert after a flurry of earthquakes earlier on Saturday -- at one point, the tremors reached an average of 230 per hour.