Jet Stream Causing Tornado Outbreak

[unable to retrieve full-text content]First, the jet stream caused a cold snap by bringing Arctic air farther south than normal, but when it shifted north, it allowed tornado-causing moist air to move into the Midwest

Source: http://www.nytimes.com/2013/05/22/science/jet-stream-causing-tornado-outbreak.html?partner=rss&emc=rss

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