S&P 500 (SPY) If this wants more downside, it has to close under 277.75. Otherwise, we might see more a time rather than price correction.
Russell 2000 (IWM) 157 pivotal all around. And especially on a weekly close. With that said, a close under 156.50 should bring in more selling.
Dow (DIA) A close under 258.80 will bring more selling. Whereas, a return over 260.40 should bring back the bulls.
Nasdaq (QQQ) Holding the 200-DMA at172.10. As long as that holds, no spirals. A close under will be a sell point.