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.
In the past seven decades, only 2003, 2004, 2008 and 2011 have faced that many tornado reports in a 30-day period, Bill Bunting, chief of forecast operations at the center in Norman, Okla., said in a telephone interview. Through Tuesday, the center got calls on 12 days of eight or more tornadoes, a preliminary record that will take months to confirm.
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