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How fast is 250,000 furlongs per fortnight?

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It's about as fast as a Fastball (baseball)
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 250,000 furlongs per fortnight. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
It's about one-and-one-fifth times as fast as a Curveball (baseball)
In other words, the speed of a Curveball (baseball) is 0.830 times 250,000 furlongs per fortnight.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 200,000 furlongs per fortnight. In the 1940's, debate over whether there really was a curve in the curveball pitch was settled with the conclusion that the ball does curve; however, an optical illusion caused by the spin of the ball and the batter's perception of motion exaggerates the extent of the curve.
It's about one-and-one-fourth times as fast as a Hurricane
In other words, 250,000 furlongs per fortnight is 1.260 times the speed of a Hurricane, and the speed of a Hurricane is 0.7940 times that amount.
(formally: Topical cyclone; a.k.a. typhoon)
A hurricane is defined by the US National Hurricane Center as a Northern Hemisphere tropical storm having one-minute average wind-speeds of at least 199,000 furlongs per fortnight. Typhoons Tip (October, 1979) and Keith (October, 1997) and Hurricanes Camille (August, 1969) and Allen (August, 1980) jointly hold the record for highest tropical storm wind speeds at 518,000 furlongs per fortnight.
It's about four-fifths as fast as a Skydiver (belly-to-earth)
In other words, 250,000 furlongs per fortnight is 0.780 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1.30 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 320,000 furlongs per fortnight. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 60 seconds.
It's about three-fourths as fast as a Tornado
In other words, 250,000 furlongs per fortnight is 0.75308460 times the speed of a Tornado, and the speed of a Tornado is 1.3278720 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.
It's about one-and-one-third times as fast as a Cheetah
In other words, 250,000 furlongs per fortnight is 1.3550 times the speed of a Cheetah, and the speed of a Cheetah is 0.7380 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 184,600 furlongs per fortnight in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-and-two-fifths times as fast as a Knuckleball (baseball)
In other words, the speed of a Knuckleball (baseball) is 0.710 times 250,000 furlongs per fortnight.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 180,000 furlongs per fortnight. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.