A pattern shift in coming days may push the jet stream farther north, reducing the frequency of the tornadoes. (Photo: Bloomberg) A pattern shift in coming days may push the jet stream farther north, reducing the frequency of the tornadoes. (Photo: Bloomberg)

(Bloomberg) — The U.S. has been rocked by 500 tornadoes in the past 30 days with a trapped jet stream in the atmosphere "stuck in neutral," the U.S. Storm Prediction Center said.

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