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How fast is 100 knots?

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It's about as fast as a Skydiver (belly-to-earth)
In other words, 100 knots is 0.97 times the speed of a Skydiver (belly-to-earth), and the speed of a Skydiver (belly-to-earth) is 1 times that amount.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 100 knots. 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 nine-tenths as fast as a Tornado
In other words, 100 knots is 0.9318052 times the speed of a Tornado, and the speed of a Tornado is 1.07319 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 95.587390 knots and 119.0497 knots. 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-three-tenths times as fast as a Fastball (baseball)
In other words, 100 knots is 1.3 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 0.77 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 81 knots. 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 seven-tenths as fast as a Skydiver (headfirst)
In other words, 100 knots is 0.71 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 1.4 times that amount.
(Head-to-Earth orientation or standing, average conditions, terminal velocity)
A head-to-Earth or standing-oriented skydiver's terminal velocity assuming average conditions is about 140 knots. In a typical jump from 3,900 m (13,000 ft), a diver in this orientation will be in freefall for 46 seconds.
It's about one-and-a-half times as fast as a Curveball (baseball)
In other words, 100 knots is 1.5 times the speed of a Curveball (baseball), and the speed of a Curveball (baseball) is 0.67 times that amount.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 65 knots. 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 two-thirds as fast as a Helicopter
In other words, 100 knots is 0.652 times the speed of a Helicopter, and the speed of a Helicopter is 1.53 times that amount.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 153 knots. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
It's about one-and-a-half times as fast as a Hurricane
In other words, 100 knots is 1.55 times the speed of a Hurricane, and the speed of a Hurricane is 0.645 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 64.30 knots. 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 167 knots.