By ASHRAF KHALIL and JEFFREY COLLINS (Associated Press) WASHINGTON (AP) — Thousands of U.S. flights were canceled or delayed, and more than 1.1 million homes and businesses lost power Monday as destructively strong storms, including potential tornadoes, hail and lightning, moved through the eastern U.S. Rain began falling in the Washington area shortly after 5 p.m., and the skies gradually turned an ominous dark gray, a precursor to the severe weather and mass power outages that were predicted. The National Weather Service issued a tornado watch for the greater D.C.