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11,680 furlongs per fortnight is about one-thirtieth as fast as a Tornado
In other words, it's 0.03518411 times the speed of a Tornado, and the speed of a Tornado is 28.421920 times that amount.
(EF2) (wind speed range average)
According to the Enhanced Fujita scale implemented by the US National Oceanographic and Atmospheric Administration, a "significant" tornado has an Enhanced Funjita scale classification of EF2 and is characterized by wind gust speeds between 295,680 furlongs per fortnight and 368,256 furlongs per fortnight. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.
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