SPY will close above $770 on August 20, handing markets a clean breakout after a choppy August 19. The ETF sat at $769.06 at the August 19 close and traded as high as $772.47 that day, a clear technical clue it can clear $770. The S&P 500 finished August 19 at 7,707.98 and the Dow was up to 53,463.…