By Pete Schroeder WASHINGTON (Reuters) – JPMorgan Chase & Co Chief Executive Jamie Dimon plans to tell Congress that the U.S. economy faces “storm clouds,” according to prepared testimony. Dimon, who is due to testify alongside major U.S. bank CEOs at congressional hearings Wednesday and Thursday, will outline the competing forces buffeting the nation’s economy. Strong consumer spending and a robust job market suggest resilience, but snarled supply chains, the war in Ukraine, high inflation and the Federal Reserve’s efforts to contain it all signal tougher times ahead, he added. “While these s…