Weather Center NPR's Greg Allen reports on the development of Norman, Okla., as an international center of expertise in the study and forecasting of severe storms. The area around Norman is in the center of "tornado alley" and is hit by tornadoes on average every three years.
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Weather Center

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NPR's Greg Allen reports on the development of Norman, Okla., as an international center of expertise in the study and forecasting of severe storms. The area around Norman is in the center of "tornado alley" and is hit by tornadoes on average every three years.