Getty Images / Bryan R. Smith US stocks plunged on Thursday as Fed Chairman Jerome Powell preached "patience" on rising inflation.Losses in major indexes accelerated as the 10-year Treasury yield spiked back above 1.5%, indicating renewed inflation fears.Sign up here for our daily newsletter, 10 Things Before the Opening Bell.US stocks fell sharply Thursday as investors reacted to comments from Federal Reserve Chair Jerome Powell.Powell refrained from outlining specific steps to rein in what he described as "disorderly" markets.