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How fast is 170 feet per second?

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It's about as fast as a Skydiver (belly-to-earth).
In other words, the speed of a Skydiver (belly-to-earth) is 1 times 170 feet per second.
(Belly-to-Earth orientation, average conditions, terminal velocity)
A belly-to-Earth oriented skydiver's terminal velocity is about 170 feet per second. 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, 170 feet per second is 0.93853510 times the speed of a Tornado, and the speed of a Tornado is 1.06549 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 161.33330 feet per second and 200.93330 feet per second. 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, the speed of a Fastball (baseball) is 0.770 times 170 feet per second.
(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 140 feet per second. 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, 170 feet per second is 0.720 times the speed of a Skydiver (headfirst), and the speed of a Skydiver (headfirst) is 1.40 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 240 feet per second. 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, the speed of a Curveball (baseball) is 0.670 times 170 feet per second.
(a.k.a. hook, a.k.a. hammer, a.k.a. yakker) (major league average)
The average speed of major league curveball pitch is 110 feet per second. 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, 170 feet per second is 0.6570 times the speed of a Helicopter, and the speed of a Helicopter is 1.520 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 259 feet per second. 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-three-fifths times as fast as a Hurricane.
In other words, 170 feet per second is 1.570 times the speed of a Hurricane, and the speed of a Hurricane is 0.6370 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 108 feet per second. 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 283 feet per second.