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How fast is 6,600 feet per minute?

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It's about one-and-one-tenth times as fast as a Hurricane.
In other words, 6,600 feet per minute is 1.01 times the speed of a Hurricane, and the speed of a Hurricane is 0.990 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 6,510 feet per minute. 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 17,000 feet per minute.
It's about as fast as a Curveball (baseball).
In other words, the speed of a Curveball (baseball) is 1 times 6,600 feet per minute.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 6,600 feet per minute. 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-tenth times as fast as a Cheetah.
In other words, 6,600 feet per minute is 1.092 times the speed of a Cheetah, and the speed of a Cheetah is 0.91580 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 6,042 feet per minute in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about one-and-one-tenth times as fast as a Knuckleball (baseball).
In other words, the speed of a Knuckleball (baseball) is 0.910 times 6,600 feet per minute.
(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 6,000 feet per minute. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about four-fifths as fast as a Fastball (baseball).
In other words, 6,600 feet per minute is 0.820 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 1.20 times that amount.
(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 8,200 feet per minute. 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 three-fifths as fast as a Skydiver (belly-to-earth).
In other words, 6,600 feet per minute is 0.630 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1.60 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 10,000 feet per minute. 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-fifths as fast as a Tornado.
In other words, 6,600 feet per minute is 0.60728740 times the speed of a Tornado, and the speed of a Tornado is 1.6466670 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 9,680 feet per minute and 12,056 feet per minute. The largest recorded tornado — an F4 event occurring in Nebraska in May, 2004 — was almost 4.02 km (2.5 mi) across.