DJIA: A close under 21,779 is an Intermediate Term Sell Signal. If triggered exit Long ETF's and replace with Short ETF's: SDS, QID, or TZA.
Option traders buy the SPY Nov $240 Puts. The DJIA is just 100 points away from triggering this Sell Signal, which can happen in just one flash-crash minute. Note that the SPY model already turned down with last week's declines.