"That all-important macro data we have been hammering for months is finally starting to turn in an ominous direction," said Alex McGrath, chief investment officer at NorthEnd Private Wealth. Markets are now predicting a half a percent cut in interest rates at the Fed's next meeting in September, up from the quarter-point cut investors had been anticipating as of Thursday, according to CME FedWatch. The two-year Treasury yield, which is also reflective of short-term interest rate expectations, fell 20 basis points, to 3.96 percent. This week had already been a rocky one for Wall Street. The Federal Reserve's indication on Wednesday that it was moving closer to cutting interest rates in September prompted an accelerated market rally, and the S&P 500 rose 2 percent on comments by Jerome H. Powell, the Fed chair.