The S&P500 overlaid with the $VXX reciprocal. Moving averages highlight the parabolic nature of the collapse in front of the board volatility. Trying to determine when a parabolic move exhausts itself is near impossible.
VXX is short term VIX futs [currently trapped in contango], not medium futs as indicated on chart. Technical indicators such as RSI, MACD and Slow STO are that for 1/VXX ratio.