MANILA — A powerful typhoon left at least 19 people dead, knocked down power and communications in entire provinces and wrought widespread destruction mostly in the central Philippines, officials said Saturday.... At its strongest, Rai packed sustained winds of 121 miles per hour and gusts of up to 168 mph, one of the most powerful in recent years to hit the disaster-prone Southeast Asian archipelago, which lies between the Pacific Ocean and the South China Sea.... The typhoon slammed into the