SPX tumbling ... watching for bottom

SP:SPX   S&P 500 Index
43 0 2
Wish I didn't have so many calls open right now. RIding lower bollinger band same way it has done a few times in the past month. ATX             indicates strong downward movement. RSI is still a touch above 30 so still some room to fall there. Early signal of reversal is RSI < 30. Next signal is separation from the lower band or a MACD crossing.