The Sensex at the Bombay Stock Exchange ended with a good gain of 349 points, or 1.8 percent, at 19,471 on Wednesday amid forecast of a normal monsoon, and firm global markets. The Nifty at the National Stock Exchange surged 111 points, or 1.9 percent, to 5,852.Stock markets in Japan, China, Hong Kong, South Korea and Singapore rose between 0.3 percent and 2.2 percent.