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Referring to "an F3" can mean a couple different things.

It may refer to one of a number of plane models including the Panavia Tornado, a fighter jet used by the RAF.

It may also refer to a level on the Fujita scale, a system of rating the severity of tornadoes. On this scale the weakest tornadoes are rated F0 while the strongest are rated F5. A rating of F3 indicates a strong tornado capable of leaving well-built houses mostly destroyed.

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10y ago

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