WTJP33 RJTD 190300 WARNING 190300. WARNING VALID 200300. STORM WARNING. SEVERE TROPICAL STORM 2424 MAN-YI (2424) 996 HPA AT 18.8N 113.9E SOUTH CHINA SEA MOVING WEST 10 KNOTS. POSITION FAIR. MAX WINDS 50 KNOTS NEAR CENTER. RADIUS OF OVER 30 KNOT WINDS 120 MILES NORTH SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 191500UTC AT 18.0N 111.7E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1006 HPA, MAX WINDS 40 KNOTS NEAR CENTER. FORECAST POSITION FOR 200300UTC AT 17.2N 110.2E WITH 57 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1010 HPA. BECOMING TROPICAL DEPRESSION. JAPAN METEOROLOGICAL AGENCY.=