Federal Reserve Chair Warsh is scheduled to deliver his most closely watched public speech since taking office at the Jackson Hole global central bank annual meeting at 10 p.m. Beijing time on Aug. 28, a Friday. Elevated U.S. Treasury yields and inflation still markedly above target have made the address a potential turning point for interest-rate expectations and bond pricing. Markets remain uncertain about the conditions that would prompt Warsh to tighten policy further. Luke Tilley, chief economist at M&T Bank Group, said Warsh may focus more on internal Federal Reserve reform and how the central bank should operate than on providing a detailed outlook for the economy and interest rates over the coming months.