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Tornado Alley, USA

New map defines nation's twister risk

Residents of Pontotoc County, Okla., take note: You're sitting smack dab at the center of a meteorological bull's-eye. Once every 4,000 years or so, a tornado strong enough to rip the roof off a house will sweep across the very spot in southeastern Oklahoma that you call home. That doesn't sound very frequent, does it? Truth be told, it isn't. Fewer than 1,200 tornadoes are spotted

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