feeds/tech+feeds/techvideo: Why tornadoes seem as if they're suddenly coming one after another

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Why tornadoes seem as if they're suddenly coming one after another May 20th 2013, 23:50 By Douglas Main, LiveScienceTornado season has been relatively quiet this year. There were only 72 tornadoes nationwide in April, 70 percent below the 10 year average, according to the Weather Channel. But within in the last week, tornado outbreaks have been erupting from North Texas to Minnesota.Why do these tornadoes seem to be hitting all of a sudden?An eastward advancing cold front is to bl... Media files: 6C7501691-g-130519-cvr-tornado-4x3-7p.standard.jpg

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