Umpires do not decide or announce changes in the strike zone, that is determined by the MLB Rules Committee. The last such change by the committee was in 1996, when the lower limit of the strike zone was changed from the top of the knees to the bottom of the knees. Umpires simply call the strike zone on what THEY PERCEIVE as the size of the zone in the rules in effect at the time.
They do if it is close or borderline to a strike
Technically yes, but some umpires dont consider it a strike, or they don't see it as a strike.
The strike zone in softball is from the armpits to the knees tall. A ball that crosses any part of the plate wide. The strike zone is supposed to stay constant, even between umpires, but some umpires will always have different strike zones than others.
They tell if the player is out or safe, if the pitch is a ball or strike, and monitor the game from getting out of hand(similar to baseball umpires)
Don't crowd the plate. If you do, the pitcher will throw at your head. The strike zone. According to the rules, it extends from the batter's knees to his shoulders. In actual practice, however, umpires consider the waist to be the top of the strike zone. This changed a little bit a few years ago, when the MLB "reminded" the umpires what the "official" strike zone was, but still, very few umpires are going to call a chest-high pitch a strike.
The strike zone is the same width as home plate, height is from the batters knees to the arm pits. Umpires call a strike by either raising a fist or pointing to the side
the strike zone is to the umpires discretion. the age group also affects it. for younger kids it could be from shoulders to knees. in the major leagues its about belt to knees
Ron Luciano has written: 'Strike two' -- subject(s): Baseball umpires, Biography 'Baseball Lite' 'The fall of the Roman umpire' -- subject(s): Baseball umpires, Biography
Yes, no other umpire can overrule a ball-strike call.
Technically yes, but no umpires ever call it because it violates the spirit of a strike as a "good pitch to hit".
only in the strike zone and it also depends on the umpires opinion if he thinks it's low than its low.