The Bombay Stock Exchange benchmark Sensex rose by 187 points to a 16-month high in opening trade on Wednesday. The 30-share BSE barometer shot up to 16,642.44 points with most of the heavyweight stocks quoting in positive territory. The Sensex had rallied over 240 points in yesterday's trading. The wide-based National Stock index Nifty crossed 4,900-points level for the first time in almost 16 months. The Nifty rose by 57.75 points to 4,949.85 points, a level last seen on May 29, 2008.