Being from NSW, I need this rule explained...?

Why does the umpire sometimes toss the ball up & sometimes bounce it?
Update: During the Swans/Lions game, the weather seemed dry & good & i saw the umpire toss the ball up.

I know if itz wet the umpire will toss it up but it just seemed strange to see him toss it up on a fine day.

Go Swaneez!!!
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