Stock market today: Dow, S&P 500, Nasdaq surge with Powell speech underway  uk.finance.yahoo.comPowell indicates conditions ‘may warrant’ interest rate cuts as Fed proceeds ‘carefully’  CNBCWatch Live: Fed Chair Jerome Powell speaks about economy in Jackson Hole speech  CBS NewsPowell set to give key speech as Trump administration ramps up pressure for a Fed overhaul  CNNPowell Plans U-Turn on an Economic Strategy That Soured  The Wall Street Journal