Wall Street is rallying on Friday after the head of the Federal Reserve indicated cuts to interest rates may be coming, though he gave no clear clue about when.

Minutes after the speech, investors pegged the chances of a quarter-point interest rate cut at 91%, up from a 75% chance assessed one day earlier, according to CME FedWatch Tool, a measure of market sentiment. Despite the market's positive reaction to Powell's speech, the Fed chair voiced a note of caution for the outlook for the U.S. economy.