A BOAT CARRYING hundreds of Somali refugees fleeing their war-wracked nation has sunk after hitting a coral reef in the Indian Ocean off Kenya's coast, killing at least 153 . . . BRITISH PRIME MINISTER John Major will meet Soviet President Mikhail Gorbachev in Moscow for the first time this week and encourage him in negotiations with the breakaway Baltic states. . . . MORE HEAVY RAINS soaked northern California early Monday, leading to the posting of flood warnings in parts of the drought-choked region, while heavy snow and rain also fell across much of the Northeast.