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Many investors use the 200 SMA as a key line in the sand, per when to enter or exit the market.  The 500 index is AT/attempting to cross the 200SMA and on  a key rising support line, drawn off the 2009 lows.

A break of both the 200SMA and support at (1) increases the odds that more investors will be willing to sell the S&P 500 in the near future.

How The Recent Decline In Stocks Looks "Eerily" Like Major Bear Markets Of The Past