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- Valid values are any county or parish in the United States and Puerto Rico - Counties or parishes should be spelled correctly, but case does not matter. - Search for multiple counties or parishes in the form County A, County B, County C with counties or parishes separated by commas (ex. Brevard, Orange, Cook)

- The Fujita Scale is used to assess the intensity and damage caused by a tornado. A tornado rated as F0 is the least damaging, while an F5 is the most damaging. - As of February 1, 2007, the Enhanced Fujita Scale was adopted.

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