How far with the stock market drop?

As I see it four possible levels with the use of moving averages, trend lines and fib levels.

First level is at ~17900, next level is between 17558 and 17460, next level is at ~16468 and next level is ~15476. It possibly might go lower if September rate hike is announced.

Good luck.

In any case, with the current strong momentum after a coiling of the price, I see room for most likely case of the second nearest level and strong 200 day MA.