(http://www.koco.com/weather/the-many-faces-of-tornado-alley/25726746)
As I typing this sentences, the tornado outbreak sequence is occurring in Texas, Oklahoma, and Kansas since 5th May. Tornado alley in the Great Plains is very famous in every Geography textbooks. Even today's tornadoes have developed more strike zone eastward by climate change, the classic Tornado alley in the Great Plains stills stands high occurrence rate for continental United States.
Tornado usually formed by several thunderstorm, or super cell. Texas, Oklahoma, and Kansas located in border of differential air masses and the path of strong jet stream from Rocky mountains. In general, tornado comes from strong thunderstorm, so other region outside than the Great Plains can have tornado. The places like Los Angeles in southern California and Madison in Wisconsin could have Tornado strike, but the latter city has higher chances. According my mother's memory, my family had two Tornado warnings and went to shelter during my live in Madison city. Since I lives in Los Angeles in 2004, I heard a few Tornado warnings from SoCal beach cities and small damages in local residential buildings. For Madison city, its quit normal have Tornado strikes, but for Los Angeles it is still rare for all Angelenos! So the imagines from Hollywood's mind, "2012" is totally B rated fancy movie but "San Andreas" might have better fit for Angelenos' theater.
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