Extreme weather events, such as these multiple tornadoes, are more likely as a result of climate change. See more: http://news.nationalgeographic.com/news/2013/13/130215-severe-storm-climate-change-weather-science/
By Jim Reed.... (Dirt Devil)The 1st time I saw one of these driving thru the desert I thought it was a tornado... From Missouri!
Mammatus Clouds - "True to their ominous appearance, mammatus clouds are often harbingers of a coming storm or other extreme weather system. Typically composed primarily of ice, they can extend for hundreds of miles in each direction."