WTJP33 RJTD 182100 WARNING 182100. WARNING VALID 192100. STORM WARNING. SEVERE TROPICAL STORM 2424 MAN-YI (2424) 990 HPA AT 18.9N 115.1E SOUTH CHINA SEA MOVING WEST 08 KNOTS. POSITION FAIR. MAX WINDS 55 KNOTS NEAR CENTER. RADIUS OF OVER 50 KNOT WINDS 20 MILES. RADIUS OF OVER 30 KNOT WINDS 120 MILES NORTH SEMICIRCLE AND 90 MILES ELSEWHERE. FORECAST POSITION FOR 190900UTC AT 18.6N 112.3E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 996 HPA, MAX WINDS 50 KNOTS NEAR CENTER. FORECAST POSITION FOR 192100UTC AT 18.0N 110.6E WITH 57 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 1004 HPA, MAX WINDS 40 KNOTS NEAR CENTER. JAPAN METEOROLOGICAL AGENCY.=